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Andrena chromotricha Cockerell, 1899
Andrena platyparia race occidentalis Cockerell, 1896; Andrena clypeonitens Cockerell, 1902; Andrena beulahensis Viereck, 1903; Andrena truncata_homonym Viereck, 1903; Andrena navajorum Viereck and Cockerell, 1914; Andrena (Leucandrena) recta Mitchell, 1960

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Cnemidandrena

Andrena chromotricha, male, face
Smithsonian Institution, Entomology Department · 9
Andrena chromotricha, male, face

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Andrena chromotricha, male, side
Smithsonian Institution, Entomology Department · 9
Andrena chromotricha, male, side
Andrena chromotricha, male, top
Smithsonian Institution, Entomology Department · 9
Andrena chromotricha, male, top

Andrena chromotricha, male, wing
Smithsonian Institution, Entomology Department · 9
Andrena chromotricha, male, wing
Andrena chromotricha FEM CFP comp
© Copyright Laurence Packer 2014 · 7
Andrena chromotricha FEM CFP comp

Andrena chromotricha MALE CFP
© Copyright Laurence Packer 2014 · 7
Andrena chromotricha MALE CFP
Andrena chromotricha, f, back, West Virginia, Pocahontas Co ---.
© Copyright source/photographer · 5
Andrena chromotricha, f, back, West Virginia, Pocahontas Co ---.

Andrena chromotricha, f, face, West Virginia, Pocahontas Co ---.
© Copyright source/photographer · 5
Andrena chromotricha, f, face, West Virginia, Pocahontas Co ---.
Andrena chromotricha, f, side, West Virginia, Pocahontas Co ---.
© Copyright source/photographer · 5
Andrena chromotricha, f, side, West Virginia, Pocahontas Co ---.

Andrena chromotricha, figure43h
Mitchell, Bees of the Eastern United States, Vol. I, 1960 · 1
Andrena chromotricha, figure43h
Andrena chromotricha, face
Smithsonian Institution, Entomology Department · 1
Andrena chromotricha, face

Andrena chromotricha, side
Smithsonian Institution, Entomology Department · 1
Andrena chromotricha, side
Andrena chromotricha, top
Smithsonian Institution, Entomology Department · 1
Andrena chromotricha, top

Andrena chromotricha, wing
Smithsonian Institution, Entomology Department · 1
Andrena chromotricha, wing
Andrena chromotricha, face
Smithsonian Institution, Entomology Department · 1
Andrena chromotricha, face
Overview
Reprinted by permission of the Regents of the University of California from: Donovan, B. J. 1977. A revision of North American bees of the subgenus Cnemidandrena (Hymenoptera: Andrenidae). University of California Publications in Entomology: 1-107.

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

Andrena chromotricha is separable from all other Cnemidandrena by the inner margins of the compound eyes convergent above throughout their length, with the vestiture white throughout. It is distinctly and closely related to A. peckhami, as it shares with this species the inner margins of the compound eyes convergent above, and the males with a strongly developed genal ridge.

FEMALE. MEASUREMENTS AND RATIOS. — N = 20; length, 7.5-9.7 mm; width, 2.5-3.1 mm; wing length, M = 2.67 ± 0.129 mm; FL/FW, M = 1.07 ± 0.352; FOVL/FOVW, M = 3.62 ± 0.134.

INTEGUMENTAL COLOR. — Black except as follows: antenna somewhat lighter beyond second flagellar segment; mandible with apical half red; tibial spurs light yellow; tarsal claws red; tegula shining yellow-brown; wing veins and pterostigma brown; wing membrane lightly smoked in about apical half; metasomal terga and sterna with apical margin hyaline; pygidial plate dark red-black.

STRUCTURE. — Scape longer than flagellar segments 1 to 3; flagellar segment 1 equal in length to flagellar segments 2 plus 3. Eye slightly less than 4 times longer than broad, inner margin converging strongly above. Malar space one-seventh as long as broad. Mandible in repose extends for one-fourth its length beyond middle of labrum; notch of mandible tooth equidistant between middle of labrum and mandible apex. Galea weakly tessellate, dorsal surface 1.5 times wider than lateral surface. Maxillary palpus with apical half of apical segment projecting beyond apex of galea; segmental ratio 0.8:1.0:0.7:0.7:0.7:0.7. Labial palpal basal segment moderately compressed laterally, weakly curved; apical segment attached subapically, segmental ratio 1.7:0.7:0.6:0.6. Labral process nearly flat, broad, short, more than 3 times wider than long; median emargination shallow, broad, depth one-fifth length of labral process. Clypeus moderately protuberant, extending below eyes for almost half its length; lower median half with "beaten" appearance, impunctate, polished, remaining areas with reticular shagreening and large punctures separated by 2 diameters. Supraclypeal area with dense shagreening obscuring weak punctures. Genal area slightly angulate posteriorly, almost twice as wide as eye, with small punctures separated by 3 diameters, third nearest eye smooth, shining, remainder shagreened, dull. Vertex above lateral ocellus slightly wider than 1 ocellar diameter, moderately tessellate towards apex with deep punctures separated by 1 diameter. Facial fovea more than half length of eye, deep, rounded above, narrowing below, reaching above to a line through lateral ocellus, below to a line below antennal fossa. Pronotal humeral angle and ridge moderately developed, humeral ridge somewhat depressed where crossed by pronotal suture, with reticular shagreening throughout. Remainder of thorax dorsally moderately tessellate, dull; posterior halves of scutellum and metanotum with large, crowded punctures; propodeal enclosure with shallow, median, longitudinal depression, anterior edge with short, irregular rugulae, dorsoposterior area with medium-sized punctures separated by 2 to 3 diameters. Mesepisternum moderately tessellate with large, deep punctures crowded dorsally, punctures weaker and scattered ventrally. Metepisternum weakly shagreened, impunctate except for a few small punctures dorsally. Propodeal corbicular area with reticular shagreening, with a few, scattered, deep punctures in anterodorsal third. Mesobasitarsus moderately expanded medially, 3 times longer than wide, slightly wider than metabasitarsus. Metabasitarsus widest basally, 4 times longer than wide. Metatibia widest distally, 3.5 times longer than wide, one-half wider than metabasitarsus. Tegula and wing veins brownish; pterostigma dark brown, 4 times longer than wide. Wing membranes with whole apical margin moderately clouded, vein 1st m-cu meets second submarginal cell one-third distance from apex of cell.

Metasomal terga 1 to 4 with discs moderately tessellate with very few, small, scattered punctures except punctures larger, separated by 1 to 3 diameters laterally on tergum 1, and on apical margins of discs of terga 2 to 4; apical areas with reticular shagreening. Tergum 5 with reticular shagreening throughout, middle third almost impunctate, remainder with prominent punctures separated by 1 to 2 diameters. Pygidial plate V-shaped, shagreened, with median third raised. Sternum 1 with small, median, V-shaped emargination, sterna 1 to 6 lightly shagreened, sterna 1 and 2 with prominent punctures separated by 3 to 4 diameters, sterna 3 to 6 with smaller punctures on apical halves.

VESTITURE. — White except as follows: tarsal hairs brown; vestiture posterior to metasomal tergum 4 brown. Lower median half of clypeus naked. Propodeal corbicular area with sparse hairs in anterior third. Trochanteral floccus imperfect. Metasomal tergum 1 with apical fascia of sparse, erect hairs, extending forwards laterally; terga 1 to 4 with apical fasciae of appressed, short hairs, fasciae obscuring one-third or less of terga, areas between fasciae with extremely few, short hairs; tergum 5 with thin covering of posteriorly directed hairs. Sternum 1 with erect hairs throughout, sternum 2 with erect hairs throughout, sternum 2 with erect hairs on median third; sterna 2 to 6 with subapical fimbriae well developed laterally; sternum 1 with appressed, apical fringe, fringes absent or nearly so on remaining sterna.

MALE. MEASUREMENTS AND RATIOS. — N = 14; length, 5.9-8.5 mm; width, 1.8-2.1 mm; wing length, M = 2.31 ± 0.109 mm; FL/FW, M = 0.89 ± 0.078; FS1/FS2, M = 1.46 ± 0.107.

INTEGUMENTAL COLOR. — Black except as follows: antenna brown beyond first flagellar segment; remainder as in female except metasomal terga and sterna with apical margin broadly hyaline.

STRUCTURE. — Scape a little shorter than flagellar segments 1 to 3; flagellar segment 1 three-fourths length of flagellar segments 2 plus 3. Eye 3.5 times longer than wide, inner margin converging strongly above. Malar space very short, 9 times wider than long. Mandible in repose extending for somewhat less than one-fourth its length beyond middle of labrum, notch of mandible tooth one-fourth of distance between middle of labrum and mandible apex from middle of labrum. Galea as in female. Maxillary palpus with half apical segment projecting beyond apex of galea; segmental ratio 0.6:0.8:0.5:0.6:0.6:0.7. Labial palpus as in female except segmental ratio 1.2:0.5:0.5:0.8. Labral process strongly reflexed, twice as wide as long, depth of median emargination half length of reflexed area. Clypeus moderately protuberant, two-thirds projecting below level of eyes; median area with "beaten" appearance; whole area with large punctures, separated by 1 diameter on dorsolateral periphery, very few punctures on lower median area, whole clypeus lightly shagreened, shiny. Supraclypeal area heavily shagreened with coarse, irregular punctures between antennal fossae. Genal area less than 3 times as wide as eye, with posterior margin strongly carinate between vertex and opposite mid-point of eye (figs. 8 and 9), sculptured as in female. Vertex less than 1.5 times diameter of lateral ocellus, sculptured as in female. Supra-antennal area as in female, with parocular areas similarly sculptured.

Pronotum with humeral angle and ridge very well developed, crossed medially by pronotal suture but humeral ridge little depressed, slightly carinate above pronotal suture; pronotum weakly tessellate above humeral angle, area above pronotal suture with dorsoventral rugulae, below pronotal suture smooth, shiny. Remainder of thorax sculptured as in female.

Metasomal terga 1 to 5 and sterna 1 to 6 shagreened throughout with small, scattered punctures, punctures absent on large, median area of tergum 1. Sternum 1 with broad, shallow, median, V-shaped, apical emargination. Sternum 7 (fig. 123) with basal apodemes narrowly incurving apically, broadly and shallowly emarginate apically, processes on each side of emargination with short, sparse hairs. Sternum 8 (fig. 124) with apex and neck region slightly longer than basal region; apex broad, truncate; neck area with abundant, long hairs. Gonoforceps (figs. 120 to 122) in dorsal and ventral views bluntly expanded apically. Penis valves in dorsal and ventral views moderately wide basally, narrowing gradually to apex except apex expanded, rounded; in lateral view angulate dorsally, downcurved and pointed apically.

VESTITURE. — White throughout. Clypeus with median, "beaten" area naked. Metasomal tergum 1 with very weak, apical fascia of nearly erect hairs, hairs more abundant laterally and anteriorly. Terga 2 to 4 with poorly developed apical fasciae of short, appressed hairs, discs with thin scattering of short, fine, erect hairs, hairs more abundant laterally. Tergum 5 with numerous, nearly appressed hairs apically, disc as for terga 2 to 4. Sterna 1 to 6 with thin scattering of long, nearly erect hairs projecting posteriorly.

VARIATION. — In both sexes the median "beaten" area of the clypeus varies from nearly smooth to very "beaten," and the punctation of this area varies from impunctate to few punctures throughout. The inner eye margins vary in degree of dorsal convergence, but are always distinctly convergent, not nearly parallel.



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

The following brief description was made from the type specimen:

FEMALE. — Length 9 mm.; black, tegulae testaceous, wings subhyaline, slightly darkened apically, veins and stigma testaceous; mid and hind legs somewhat reddened; clypeus protuberant, median portion somewhat flattened, with a median impunctate line, punctures sparse and fine on each side of line, but becoming close and very fine laterally; process of labrum very broad and short, with a more narrowly truncate apex; facial foveae very narrow; malar space short but evident; cheeks rounded, slightly broader than eyes; vertex narrow behind ocelli; face below ocelli finely striate; cheeks shining, very minutely punctate; mid antennal segments slightly longer than broad, basal segment of flagellum twice as long as second; thorax and abdomen dull and tessellate, entirely impunctate; pubescence of head and thorax ochraceous, copious on thorax, abdominal terga 2-4 with entire, apical, ochraceous fasciae, segment 1 with long and loose, ochraceous pubescence.

DISTRIBUTION. — New Mexico to Wisconsin.

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

Synonymous name : Andrena Recta

FEMALE—Length 9 mm.; clypeus broadly convex, projecting about one-half below suborbital line, shining, punctures rather irregular and sparse medially, becoming somewhat more close and distinct laterally, with a rather broad but indefinite, median, impunctate line; facial foveae rather narrow, occupying above only slightly more than half of space between eyes and ocelli, covered with whitish tomentum; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks slightly broader than eyes, rounded posteriorly, rather dull, punctures minute, close and rather obscure; malar space short; basal segment of flagellum subequal to 2nd and 3rd combined; pubescence of head, thorax and legs pale ochraceous, becoming somewhat infuscated on the more apical leg joints; thoracic integument dull, punctures of scutum shallow and obscure, well separated but not sparse anteriorly, becoming more sparse and obscure posteriorly, those on scutellum hardly visible, surface quite smooth, more shining; pleura dull and tessellate; propodeal corbicula well developed; anterior fringe rather poorly developed; trochanteral fioccus well developed; tibial scopa rather dense, hairs of moderate length, not visibly plumose, whitish; hind tibiae rather slender and elongate, basitarsi somewhat narrower, mid basitarsi fully as broad as mid tibiae, with short fuscous hairs along anterior margin; 2nd submarginal cell very short, receiving 1st recurrent toward apex; abdominal terga smooth but dull, entirely impunctate, apical depressed areas rather narrow, becoming narrowly yellowish-hyaline along rims, discal pubescence very short, sparse and inconspicuous, dark on the more apical terga, terga 2-4 with quite dense, entire, whitish, apical fascian, tergum 5 with a dense, brownish-fuscous, apical fimbria.

TYPES—Holotype: Female, Grandfather Mt., N. C., Sept. 21, 1945 (Mitchell) [author’s coll.j. Paratypes: NORTH CAROLINA: 12, topotypical. MICHIGAN: 19, Midland Co., Aug. 27, 1950 (R. R. Dreisbach). PENNSYLVANIA: 19, Cambria Co., Aug. 25, 1925 (C.F. Byers). MINNESOTA: 19, Sedan, July 1928 (Donald Denning); 19, J. C. Golf Club, Ramsey Co., Aug. 9, 1922 (C. E. Mitchell); 19, Crookston, July 24, 1951 (R. L. Fischer, on Helianthus annuus). NEW YORK: 1 9, Derby, Aug. 18, 1951 (K. V. Krombein); 1 9, Ithaca, Aug. 24, 1954 (prey of Philcintlius) (C. S. Lin).

Paratypes are located at the University of Michigan, the University of Minnesota, Cornell University, the U. S. National Museum, and in the collections of R. R. Dreisbach, R. L. Fischer, and the author.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Apiaceae  Daucus carota @ CUIC_ENT (1)
Asteraceae  Aster @ AMNH_BEE (2)

Boltonia asteroides @ AMNH_BEE (1)

Grindelia squarrosa @ AMNH_BEE (14)

Helianthus annuus @ AMNH_BEE (1)

Helianthus glaberrimus @ AMNH_BEE (1)

Helianthus maximiliani @ AMNH_BEE (3)

Helianthus sp @ CUIC_ENT (1)

Helianthus tuberosus @ AMNH_BEE (2)

Lactuca pulchella @ AMNH_BEE (3)

Solidago canadensis @ AMNH_BEE (8)

Solidago sp @ CUIC_ENT (2)

Symphyotrichum ericoides @ AMNH_BEE (1)

Symphyotrichum lanceolatum @ AMNH_BEE (1)

Taraxacum campylodes @ AMNH_BEE (4)

Taraxacum officinale @ AMNH_BEE (2)
Fabaceae  Melilotus officinalis @ AMNH_BEE (3)
Lamiaceae  Physostegia parviflora @ AMNH_BEE (2)
Polygonaceae  Persicaria sp @ CUIC_ENT (1)

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