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Andrena krigiana Robertson, 1901
Pterandrena krigiana (Robertson, 1901); Andrena (Ptilandrena) parakrigiana Mitchell, 1960

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Callandrena_sensu_lato

Andrena krigiana, female, back 2012-08-06-18.10.32 ZS PMax
© Copyright source/photographer · 9
Andrena krigiana, female, back 2012-08-06-18.10.32 ZS PMax

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    Identification Note: Males can either have a yellow or an entirely black clypeus. In the past these were separated into two species.
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Andrena krigiana, female, face 2012-08-06-18.17.39 ZS PMax
© Copyright source/photographer · 9
Andrena krigiana, female, face 2012-08-06-18.17.39 ZS PMax
Andrena krigiana, female AMNH BEE-00008889-3
© Copyright Hadel Go 2011-2016 · 8
Andrena krigiana, female AMNH BEE-00008889-3

Andrena krigiana, male AMNH BEE-00092116-3
© Copyright Hadel Go 2011-2016 · 8
Andrena krigiana, male AMNH BEE-00092116-3
Andrena krigiana, female AMNH BEE-00008889-1
© Copyright Hadel Go 2011-2016 · 7
Andrena krigiana, female AMNH BEE-00008889-1

Andrena krigiana, female AMNH BEE-00008889-2
© Copyright Hadel Go 2011-2016 · 7
Andrena krigiana, female AMNH BEE-00008889-2
Andrena krigiana, male AMNH BEE-00092116-1
© Copyright Hadel Go 2011-2016 · 7
Andrena krigiana, male AMNH BEE-00092116-1

Andrena krigiana, male AMNH BEE-00092116-2
© Copyright Hadel Go 2011-2016 · 7
Andrena krigiana, male AMNH BEE-00092116-2
Andrena krigiana, male, cheek
© Rebekah Andrus Nelson · 2
Andrena krigiana, male, cheek

Andrena krigiana, side
Thom Wilson of Baltimore City · 1
Andrena krigiana, side
Andrena krigiana, male, face
© Rebekah Andrus Nelson · 1
Andrena krigiana, male, face

Andrena krigiana F 017877, dorsal abdomen
Deana Crumbling · 1
Andrena krigiana F 017877, dorsal abdomen
Andrena krigiana F 017877, dull clypeus
Deana Crumbling · 1
Andrena krigiana F 017877, dull clypeus

Andrena krigiana F 017877, emarginate labral process
Deana Crumbling · 1
Andrena krigiana F 017877, emarginate labral process
Andrena krigiana F 017877, flagellomeres
Deana Crumbling · 1
Andrena krigiana F 017877, flagellomeres
Overview
Reprinted with permission of the University of Nebraska State Museum from:
LaBerge, W. E. 1967. A revision of the bees of the genus Andrena of the Western Hemisphere. Part I. Callandrena (Hymenoptera: Andrenidae). Bulletin of the University of Nebraska State Museum 7: 1-316.


Please report text errors to: leah at discoverlife dot org.

Andrena krigiana is one o£ the smallest species of Callandrena known. It is not closely related to any o£ the foregoing species but might be confused with A. simplex, another small eastern species. A. krigiana is distinctive in both sexes because of the relatively small second submarginal cell which along its posterior margin equals less than one-third the length of the first submarginal cell and along its anterior margin is about equal to the length of vein Rs between the cell and the pterostigma. Both sexes are also marked by the relatively large pterostigma and the relatively long maxillary palpae. In addition, the female of krigiana has short facial foveae, a dull clypeus and incomplete propodeal corbicula. The male has the clypeus usually with a median yellow macula, but more or less infuscated peripherally and occasionally entirely black.

FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 8-9 mm; width, 2.0-2.5 mm; wing length, M = 2.79 ± 0.651 mm; FL/FW, M = 1.12 ± 0.010; FOVL/FOVW, M = 2.57 ± 0.015.

INTEGUMENTAL COLOR. — Black except as follows: mandibles rufescent; flagellum dark brown below; tegulae hyaline, yellowish-brown; tergal apices narrowly hyaline, clear at apex to rufescent; sterna hyaline apically; legs dark rufescent, tibial spurs yellow.

STRUCTURE. — Antennae short, scape longer than segments 1-4; flagellar segment 1 longer than segments 2 plus 3, often equal to segments 2-4, segments 2 and 3 subequal in length, shorter than segment 4. Eye about three and one-half times as long as broad or slightly longer, inner margins converging slightly toward mandibles. Malar space linear. Mandible short, outer mandible extends about one-fifth its length beyond middle of labrum in repose, bidentate; ventrobasal lamella weakly developed. Galea evenly rounded from dorsum to side, lateral portion about one-third as broad as upper; surface dulled by fine regular tessellation, without distinct punctures, with few scattered minute hairs. Maxillary palpus long, extends forward beyond tip of galea by length of last palpal segment or slightly more; segments in ratio of about 1.0:1.2:0.7:0.7:0.5:0.7. Labial palpus with first segment long, strongly curved, terete basally, flattened and broadened apically; segments in ratio of about 1.2:0.5:0.5:0.6. Labral process trapezoidal with weak apical emargination, not bidentate. Clypeus rounded, with small round obscure punctures, surface dulled by coarse tessellation. Supraclypeal area similar. Genal area no broader than eye in profile, wit; round punctures separated by one to two puncture widths, surface moderately shiny, with coarse reticular shagreening especially posteriorly. Vertex above lateral ocellus equals about one ocellar diameter, occasionally slightly less, punctures obscured by dense, coarse tessellation. Face above antennal fossae with weak longitudinal rugulae ending between lateral ocellus and facial foveae and coarse irregular punctures. Facial fovea short, broad above, pointed on eye margin below, separated from lateral ocellus by one ocellar diameter, extending below to about level of upper margin of antennal fossa.

Pronotum normal, dulled by fine reticular shagreening. Mesoscutum dull, with small dense obscure punctures and coarse tessellation; parapsidal line shorter than from upper end of line to lateral margin of scutum. Tegulae normal. Scutellum sculptured as in mesoscutum but punctures somewhat denser. Propodeum with enclosure triangular, lateral margins straight, rather coarsely and irregularly rugulose; posterior and dorsolateral areas with coarse shallow punctures and dense coarse tessellation dulling surfaces; corbicular area moderately shiny, with coarse reticular shagreening and few scattered punctures. Mesepisternum sculptured as in mesoscutum but punctures less obscure, separated by one or more puncture widths. Metepisternum sculptured as in corbicular area. Middle basitarsus not at all expanded, parallel-sided, narrower than hind basitarsus. Wings with three submarginal cells, rarely with two in One wing; second cell receives vein 1st m-cu near or before middle of cell, cell short, more or less rectangular, along posterior margin equals one-third of first submarginal cell in length of vein r between pterostigma and cell; pterostigma large, broader than from inner margin of prestigma to wing margin and about three times as long as prestigma. Claws and tibial spurs normal.

Metasomal terga shiny to moderately shiny; terga 2-4 punctate, punctures round, small, separated mostly by one puncture width or slightly more, surfaces reticularly shagreened, occasionally somewhat dulled. Pygidial plate V-shaped with small rounded apex. Sterna 2-5 shiny, with narrow apical areas impunctate, basally with round punctures separated by two puncture widths apically, sparser towards base.

VESTITURE. — Generally pale ochraceous to ochraceous, darker on vertex and dorsum of thorax. Terga 2-4 with weak apical pale tends often broadly interrupted medially; terga 5 and 6 with long Bale ochraceous hairs. Sterna 2-5 with subapical fimbriae of long suberect hairs, shorter medially. Propodeal corbicula incomplete, Without anterior hairs, dorsal hairs relatively short and sparse, sternal hairs absent save a few long hairs adjacent to dorsal hairs. Trochanteral flocculus complete but sparse. Tibial scopa plumose throughout, of normal length. Inner surfaces tarsi golden-yellow.

MALE. MEASUREMENTS AND RATIOS. — N = 20; length, 7.5-9.0 mm; width, 1.6-2.5 mm; wing length, M = 2.47 ± 0.621 mm; FL/FW, M = 1.13 ± 0.012; FS1/FS2, M = 2.93 ± 0.068.

INTEGUMENTAL COLOR. — As in female except as follows: clypeus usually yellow medially between maculae below tentorial pits, usually infuscated around entire periphery and lateral areas entirely black, occasionally entire clypeus black (as in parakrigiana Mitchell); flagellar segments 4-11 reddened below; terga more broadly hyaline apically.

STRUCTURE. — Antennae short, not extending back beyond middle of tegulae in repose; scape equal in length to flagellar segments 1-4; flagellar segment 1 about equal in length to segments 2-4, segments 2-4 short, subequal, shorter than segment 5, segment 4 often slightly longer than 2 or 3; segments 5-10 about as broad as long. Eye three times as long as broad or slightly longer, inner margins strongly converging towards mandibles. Malar space, mandible and galea as in female. Maxillary palpus as in female but ratio about 1.0:1.5:1.1:0.8:0.8:0.9. Labial palpus as in female but ratio about 1.1:0.6:0.5:0.6. Labrum, clypeus and supraclypeal area as in female. Genal area subequal to eye in width, sculptured as in 1female. Vertex short, above lateral ocellus usually slightly less than diameter of ocellus; sculptured as in female. Face above antennal fossae as in female but rugulae often less evident.

Thoracic and metasomal sculpturing generally as in female except as follows: tergal punctures slightly sparser and terga generally shinier; sterna 2-5 with punctures sparse, surfaces moderately duller by reticular shagreening; sternum 6 gently tinned down in apical half, apically with broad V-shaped emargination.

Genitalia and sterna 7 and 8 (Figs. 159-163) similar to those of bullata but note following differences: penis valves shorter; sternum 7 with deep apical emargination; sternum 8 with neck region more slender.

VESTITURE. — Generally pale ochraceous to ochraceous, darker on vertex and dorsum of thorax. Terga 2-5 with weak apical pale bands usually broadly interrupted medially especially on terga 2 and 3. Sterna with weak subapical fimbriae of long sparse suberect hairs. Inner surfaces tarsi golden-yellow.

TYPE MATERIAL. — The lectotype (INHS) female, here designated of krigiana from Carlinville, Illinois, June 15, 1901, was collected by Charles A. Robertson. The holotype (NCSU) male of parakrigiana from Butler, Georgia, March 29, 1938, was collected by P. W. Fattig.

DISTRIBUTION. — A. krigiana is rather widely distributed from Minnesota, Oklahoma and Texas in the west to the Atlantic seaboard and north to New York (Fig. 12). It has been taken from March 16th through June 20th, but chiefly in April in the southern areas and May or June in the northern parts of its range. In addition to the type material, 74 females and 48 males have been examined from the localities listed below. This list includes localities reported in the literature.

ARKANSAS: Fulton; Jonesboro (2 miles E.); Lonoke. CONNECTICUT: New Haven. FLORIDA; Torreya State Park, Liberty Co. GEORGIA: Butler; Ft. Gordon; Roosevelt State Park, Harris. ILLINOIS: Alto Pass; Carlinville; Cobden; Dongola; Palos Park; Urbana; Willow Springs. LOUISIANA: Opelousas. MARYLAND: Chesapeake Beach. MINNESOTA: Houston Co. MISSISSIPPI: Hattiesburg. NEW JERSEY: Great Piece Meadow; Hewitt; Utona; Jamesburg; Newfoundland; Ocean Co.; Ramsey. NEW ORK: Huntington. NORTH CAROLINA: Aberdeen; Black Mts.; Lake Waccamaw; Raleigh; Swannanoa; Willard. OHIO: Wooster. OKLAHOMA: Stillwater. PENNSYLVANIA: Ashbourne; Hecton Mills; Philadelphia; Roxborough. SOUTH CAROLINA: Dillon. TENNESSEE: Oakland. TEXAS: Carthage; Eldora; Fedor, Lee Co.; Jefferson; Liberty; Livingston; Tanana, Shelby Co. VIRGINIA: Beverly Hills.

FLORAL RECORDS. — This species is an oligolege of Krigia (Compositae) after which it was named. Robertson (1929) collected it only from Krigia biflora (= K. amplexicaulis). From the specimens before me, it has been collected only five times with floral data and one of these collections (13 females) was from K. Virginia. The flowers from which it has been taken are listed below.

Cornus sp., Hieracium venosum, Krigia sp., K. biflora, K. virginia, Ranunculus acris.



Reprinted with permission from: Mitchell, T.B. 1960. Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.

FEMALE — Length 8 mm.; clypeus slightly convex, projecting about one-third below suborbital line, dull, densely tessellate, punctures fine, shallow, close and obscure; facial foveae rather narrow, occupying above little more than half of space between eyes and ocelli (as in erigeniae, fig. 29), covered with ochraceous tomentum; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks subequal to eyes in width, rounded posteriorly, somewhat shining, punctures fine but rather deep, well separated; malar space very short; basal segment of flagellum subequal to segments 2-4 combined; process of labrum subtriangular, apex more or less narrowly truncate; pubescence of head, thorax and legs entirely ochraceous; thoracic integument dull, densely tessellate, punctures of scutum very fine, more distinct and well separated anteriorly, becoming extremely minute and very close posteriorly, scutellum without visible punctures; pleura with some shallow, rather coarse but indefinite punctures above, elsewhere punctures hardly evident; dorsal area of propodeum nearly vertical, triangle finely rugose; propodeal corbicula rather poorly developed, short, without an anterior fringe, pale ochraceous; trochanteral floccus rather well developed, whitish-ochraceous; hind tibiae rather narrow, apex not much broader than basitarsi, scopa quite dense, hairs of moderate length, densely plumose, entirely pale ochraceous; front and middle basitarsi slightly narrower than their respective tibiae; 2nd submarginal cell very short, much shorter than 3rd, receiving 1st recurrent near middle; abdominal terga smooth and shining, very finely and rather closely punctate, apical impressed areas shallow, not very broad, becoming rather broadly yellowish-hyaline along rims, discal pubescence thin, short and erect, entirely pale ochraceous, terga 2-4 with extremely narrow and thin, pale ochraceous, apical fasciae, tergum 5 with an ochraceous, apical fimbria.

MALE — Length 8 mm.; clypeus very slightly convex, projecting not much more than one-fourth below suborbital line, yellow except for the dark marginal area and the apical rim, somewhat shining, closely and minutely punctate; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks subequal to eyes in width, somewhat shining, punctures very fine and quite obscure; malar space very short; basal segment of flagellum subequal to segments 2-4 combined; process of labrum about twice as broad as long, slightly narrowed to the rather broadly truncate apex; mandibles rather short, with a distinct, inner, subapical tooth, overlapping but very slightly; pubescence of head, thorax and legs entirely pale ochraceous; thoracic integument dull, densely tessellate, punctures of scutum shallow, rather fine and obscure, rather well separated anteriorly, becoming closer and more obscure posteriorly, those on scutellum hardly visible; pleura finely roughened or obscurely, shallowly punctate above, elsewhere densely tessellate; dorsal area of propodeum nearly vertical, triangle finely rugose; all basitarsi slender and elongate, considerably narrower than their respective tibiae; 2nd submarginal cell exceedingly short, receiving 1st recurrent near middle, abdominal terga smooth and shining, minutely but rather distinctly punctate, punctures well separated but not sparse, apical impressed areas very shallow, not very broad, becoming very distinctly yellowish-hyaline along rims, discal pubescence very short, thin and erect, entirely pale ochraceous, terga 2-4 with extremely thin and obscure, apical fasciae barely evident; apical portion of sternum 8 rather slender, tip rather narrowly truncate, clothed beneath with short, pale pubescence; penis valves slender apically, rather broadly dilated basally, excavated laterally, gonocoxites slender basally, rather gradually and broadly dilated apically, forming rather broad lobes, gonocoxal lobes somewhat produced, rather narrowly rounded apically.

DISTRIBUTION — Illinois to Connecticut, south to North Carolina and Georgia; March to June.

FLOWER RECORDS — Robertson (1929) records krigiana on Krigia amplexicaulis.


Described under the synonymous name: Andrena parakrigiana

MALE — Length 7 mm.; clypeus convex, entirely black; projecting about one-fourth below suborbital line, dull and tessellate, punctures very minute, close and obscure; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks slightly narrower than eyes, rounded posteriorly, rather dull, punctures exceedingly minute and obscure; malar space lacking; basal segment of flagellum somewhat longer than 2nd and 3rd combined, these very short, considerably broader than long; process of labrum rather broad, quite short, broadly subtriangular, the apex truncate and not noticeably emarginate; mandibles rather short, with a distinct, inner, subapical tooth, overlapping but very slightly; pubescence of head, thorax and legs entirely pale ochraceous; thoracic integument dull and densely tessellate, scutum and scutellum without visible punctures; pleura above with rather close, shallow and obscure punctures, otherwise very densely tessellate; dorsal area of propodeum narrowly oblique, triangle obscurely rugoso-striate; all basitarsi slender and elongate, considerably narrower than their respective tibiae; 2nd submarginal cell much shorter than 3rd, receiving 1st recurrent slightly beyond middle; abdominal terga smooth and shining, minutely but quite distinctly punctate, punctures well separated but not sparse, apical depressed areas shallow and rather narrow, distinctly hyaline along rims, discal pubescence short, thin, erect and entirely pale, apical margins of the terga only very obscurely subfasciate; apical portion of sternum 8 slender and elongate, gradually broadened toward base, subtruncate apically, clothed beneath with rather dense pale pubescence; penis valves slender apically, somewhat dilated toward base, not excavated, gonocoxites dilated apically, forming rather elongated lobes, gonocoxal lobes slightly produced, narrowly rounded apically.

TYPE - Holotype: Male, Butler, Ga., March 29, 1938 (P. W. Fattig). [author's coll.]. It seems possible that this is a variant of krigiana. The chief difference is in the clypeus, this being entirely black in parakrigiana, whereas in krigiana the broad central area of this plate is yellow. Collection of a longer series, of both sexes, is needed before a more positive opinion is justified.



Described under the synonymous name: Andrena parakrigiana

MALE—Length 7 mm.; elypeus convex, entirely black; projecting about one-fourth below suborbital line, dull and tessellate, punctures very minute, close and obscure; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks slightly narrower than eyes, rounded posteriorly, rather dull, punctures exceedingly minute and obscure; malar space lacking; basal segment of flagellum somewhat longer than 2nd and 3rd combined, these very short, considerably broader than long; process of labrum rather broad, quite short, broadly subtriangular, the apex truncate and not noticeably emarginate; mandibles rather short, with a distinct, inner, subapical tooth, overlapping but very slightly; pubescence of head, thorax and legs entirely pale ochraceous; thoracic integument dull and densely tessellate, scutum and scutellum without visible punctures; pleura above with rather close, shallow and obscure punctures, otherwise very densely tessellate; dorsal area of propodeum narrowly oblique, triangle obscurely rugoso-striate; all basitarsi slender and elongate, considerably narrower than their respective tibiae; 2nd submarginal cell much shorter than 3rd, receiving 1st recurrent slightly beyond middle; abdominal terga smooth and shining, minutely but quite distinctly punctate, punctures well separated but not sparse, apical depressed areas shallow and rather narrow, distinctly hyaline along rims, discal pubescence short, thin, erect and entirely pale, apical margins of the terga only very obscurely subfasciate; apical portion of sternum 8 slender and elongate, gradually broadened toward base, subtruncate apically, clothed beneath with rather dense pale pubescence; penis valves slender apically, somewhat dilated toward base, not excavated, gonocoxites dilated apically, forming rather elongated lobes, gonocoxal lobes slightly produced, narrowly rounded apically.

TYPE—Holotype: Male, Butler, Ga., March 29, 1938 (P. W Fattig). [author’s coil.]. It seems possible that this is a variant of krigiana. The chief difference is in the dypeus, this being entirely black in parakrigiana, whereas in krigiana the broad central area of this plate is yellow. Collection of a longer series, of both sexes, is needed before a more positive opinion is justified.


Names
Scientific source:

References
Andrena krigiana Robertson, 1901, Canadian Entomologist, vol. 33, p. 229; Cockerell, 1906, Annals of the Magazine of Natural History, ser. 7, vol. 17, p. 308; Viereck, 1916, Connecticut State Geological and Natural History Survey Bulletin of the 22, r p. 777; Britton, 1920, Connecticut State Geological and Natural History Survey Bulletin of the 31. p. 343; Brimley, 1938, Insects of North Carolina, p. 453.

Pterandrena krigiana: Robertson, 1902, Transactions of the American Entomological Society, vol. 28, p. 194; 1914, Entomological News, vol. 25, p. 69; 1925, Ecology, vol. 6, p. 426; 1926, Ecology, vol. 7, p. 379; 1929, Flowers and Insects, p. 9; Pearson, 1933, Ecology Monographs, vol. 3, p. 383.

Andrena (Pterandrena) krigiana: Lanham, 1949, University of California Publications in Entomology, vol. 8, p. 200.

Andrena (Ptilandrena) krigiana: Mitchell, 1960, North Carolina Agricultural Experiment Station Technical Bulletin of the No. 141, p. 156.

Andrena (Ptilandrena) parakrigiana Mitchell, 1960, North Carolina Agricultural Experiment Station Technical Bulletin of the No. 141, p. 157 (new synonymy).

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FamilyScientific name @ source (records)
Apiaceae  Zizia aurea @ CUIC_ENT (1)
Asteraceae  Hieracium aurantiacum @ CUIC_ENT (1)
Cornaceae  Cornus canadensis @ AMNH_BEE (1)

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