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Andrena arabis Robertson, 1897
Andrena (Pterandrena) brassicae_homonym Mitchell, 1960

Life   Insecta   Hymenoptera   Apoidea   Andrenidae   Andrena
Subgenus: Scaphandrena

Andrena arabis, male AMNH BEE00090989-3
© Copyright Hadel Go 2011-2016 · 9
Andrena arabis, male AMNH BEE00090989-3

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    Identification Note: The clypeus of the male is white to off-white instead of the more usual yellow and the colored portion of the clypeus stops just shy of the outer margins of the clypeus, leaving a very thin unmarked area.
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Andrena arabis FEM mm .x f
© Copyright Laurence Packer 2014 · 7
Andrena arabis FEM mm .x f
Andrena arabis, male AMNH BEE00090989-1a
© Copyright Hadel Go 2011-2016 · 7
Andrena arabis, male AMNH BEE00090989-1a

Andrena arabis, male AMNH BEE00090989-2
© Copyright Hadel Go 2011-2016 · 7
Andrena arabis, male AMNH BEE00090989-2
Andrena arabis, M, Face, NY, Orange Co ---.. ZS PMax
© Copyright source/photographer · 5
Andrena arabis, M, Face, NY, Orange Co ---.. ZS PMax

Andrena arabis, f, back, beltsville, md ---.
© Copyright source/photographer · 5
Andrena arabis, f, back, beltsville, md ---.
Andrena arabis, f, face, beltsville, md ---.
© Copyright source/photographer · 5
Andrena arabis, f, face, beltsville, md ---.

Andrena arabis, F, side, beltsville, md ---.
© Copyright source/photographer · 5
Andrena arabis, F, side, beltsville, md ---.
Andrena arabis, F, side, beltsville, md ---.BW
© Copyright source/photographer · 5
Andrena arabis, F, side, beltsville, md ---.BW

Andrena arabis, m, back, beltsville, md ---.
© Copyright source/photographer · 5
Andrena arabis, m, back, beltsville, md ---.
Andrena arabis, m, face, beltsville, md ---.
© Copyright source/photographer · 5
Andrena arabis, m, face, beltsville, md ---.

Andrena arabis, m, side, beltsville, md ---.
© Copyright source/photographer · 5
Andrena arabis, m, side, beltsville, md ---.
Andrena arabis, female AMNH BEE00035749-1a
© Copyright Hadel Go 2011-2016 · 4
Andrena arabis, female AMNH BEE00035749-1a

Andrena arabis, female AMNH BEE00035749-2
© Copyright Hadel Go 2011-2016 · 4
Andrena arabis, female AMNH BEE00035749-2
Andrena arabis, female AMNH BEE00035749-3
© Copyright Hadel Go 2011-2016 · 4
Andrena arabis, female AMNH BEE00035749-3
Overview
Reprinted with permission of the American Entomological Society from: Ribble, D. W. 1974. A revision of the bees of the genus Andrena of the Western Hemisphere. Subgenus Scaphandrena. Transactions of the American Entomological Society 100: 101-189.

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

Andrena arabis hybridizes with A. scurra and A. capricornis. See the discussion under scurra above and a later section of this paper which deals with these hybrids. Further details on the hybridization can be found in Ribble (1973). The tables and discussion in Ribble as well as the keys above can be used to separate arabis from capricornis and scurra. See Ribble also for range maps.

The descriptions below were based mainly on a female from Ithaca, New York and a male from Tompkins County, New York.

FEMALE. MEASUREMENTS AND RATIOS. Length, 10.0 mm; width, 2.6 mm; wing length, 7.5 mm; FL/FW, 1.13; FOVL/FOVW, 4.40.

INTEGUMENTAL COLOR. As in scurra except hind tibia and tarsus entirely dark.

STRUCTURE. Antennal scape slightly longer than first four flagellar segments; flagellar segment 1 distinctly longer than segments 2 plus 3; segments 8 and 9 slightly longer than broad; otherwise as in scurra. Eyes\each about 3.5 times as long as broad, inner margins converging very slightly towards mandibles. Mandible and galea as in scurra. Stipes with mostly hooked hairs. Labial palpus as in scurra but ratio about as 1.0:0.6:0. 6:0.8. Maxillary palpus as in scurra but ratio about as 0.9:1.0:0.9:0.9:0. 9:0.9. Labral process wide basally, apically greatly narrowed to subtriangular, truncate elevation; labrum below process as in scurra. Clypeus flattened in center with very large scattered punctures, irregular impunctate rugae present, surface shiny apically, reticular shagreening weak to absent apically. Supraclypeal area as in scurra. Face above antennal fossae with indistinct longitudinal rugulae and rather coarse shagreening, dull. Facial fovea separated from lateral ocellus by one and one-half ocellar diameters, otherwise as in scurra. Vertex above lateral ocellus about as high as one-half ocellar diameter, dull. Genal area with surface dull except along eye margin, otherwise as in scurra.

Pronotum as in scurra. Mesoscutum as in scurra except shiny area in center absent. Scutellum weakly shiny, with reticular shagreening, punctures sparse in center. Propodeum and mesepisternum as in scurra. Wings as in scurra except second submarginal cell distinctly narrowed anteriorly. Tarsal claws untoothed. Hind tibia slender, only slightly widened towards apex.

Metasomal tergum 1 without apicolateral elevation, on terga 2-4 elevations weakly developed; terga with minute punctures separated mostly by two to three puncture widths; shagreening slightly more distinct than in scurra. Tergum 5 as in scurra. Pygidial plate as in scurra but internal part abruptly elevated, narrow, pointed at apex. Sterna 2-5 as in scurra but punctures further apart, separated mostly by two or three puncture widths.

VESTITURE. As in scurra except as follows: facial foveal hairs with brown tinge under some lightings; thoracic dorsum with abundant hairs posteriorly; tarsal hairs brownish on inner surfaces; tibial scopal hairs of moderate length towards apex of tibia, hairs along anterior margin mostly curved anteriorly, scopal hairs rather sparse; apical fasciae weakly developed, broadly interrupted on center of tergum 2, very weakly developed on center of tergum 3, on tergum 4 fascial hairs rather sparse.

MALE. MEASUREMENTS AND RATIOS. Length, 8.5 mm; width, 2.6 mm; wing length, 6.6 mm; FL/FW, 1.06; FS1/FS2, 2.00.

INTEGUMENTAL COLOR. As in female but clypeus white with slight yellowish tinge except for apex and two dark spots.

STRUCTURE. Antenna as in scurra except: scape length slightly longer than first three flagellar segments; flagellar segment 1 as long as segment 2 plus 3, segment 2 slightly swollen, broader than long, segment 3 about as broad as long. Eye about three and one-half times as long as broad, otherwise as in scurra. Mandible, stipes and galea as in scurra. Labial palpus as in scurra but ratio about 1.0:0.4:0.4:0.6. Maxillary palpus as in scurra but ratio about 0.7:1.0:1.0:0.9:0.9:0.9. Labral process moderate in size, trapezoidal, emarginate at apex, elevated, labrum apical to process as in scurra. Clypeus in center with few large scattered punctures, large impunctate area, flattened area on each side of midline, reticular shagreening basally, weak to absent apically. Supraclypeal area, face above antenna] fossae, vertex and genal area as in female but vertex above lateral ocellus about as high as three-fourths ocellar diameter.

Pronotum, mesoscutum, scutellum, propodeum and mesepisternum as in female. Wing venation as in female except vein 1st m-cu meets second submarginal cell just before middle of cell. Tarsal claws as in scurra; hind tibia normal, not swollen.

Metasomal terga 1-5 moderately shiny, with reticular shagreening, scattered minute punctures; on tergum apicolateral elevations absent, on other terga elevations weak. Sterna as in scurra but punctures more scattered.

Terminalia as in figures 14-18; note the following: gonocoxite with dorsal lobes very short and very broadly rounded, apex moderately expanded; penis valve with dorsal lamellae large, long, rounded lobe, apex short, thick, broadly rounded slightly expanded in ventral view; sternum 7 with large apical notch; sternum 8 with apex slightly broader than neck region.

VESTITURE. As in scurra except: hairs mostly dirty white, inner tarsal hairs with yellowish-brown tinge; tergum 1 in center with hairs few and mostly short; apical fasciae on terga 2-4 very weakly developed, broadly interrupted in center on terga 2 and 3.



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 9 mm.; face slightly longer than broad; clypeus somewhat produced, with median area flattened, projecting nearly one-half below suborbital line, rather dull and finely tessellate, punctures fine but deep and distinct, rather widely separated and uniformly distributed; facial foveae narrow, occupying above hardly more than half of space between eyes and lateral ocelli, covered with pale ochraceous tomentum; space between margin of vertex and lateral ocelli less than their diameter; cheeks not much broader than eyes, rounded posteriorly, dull, very minutely and obscurely punctate; malar space very short; basal segment of flagellum very slightly exceeding 2nd and 3rd combined; process of labrum rather small, broadly subtriangular, apex narrowly truncate, slightly elevated; pubescence of head, thorax and legs entirely ochraceous; thoracic integument rather dull, punctures of scutum anteriorly fine and shallow but rather distinct and close, becoming very sparse and obscure posteriorly; scutellum very dull, sparsely and very finely punctate; pleura dull, densely tessellate, punctures evident anteriorly but inevident posteriorly; enclosure of propodeum dull, tessellate, obscurely rugose along basal margin; propodeal corbicula rather poorly developed, without an anterior fringe; trochanteral floccus rather well developed; tibial scopa quite dense, hairs rather short and simple, entirely pale ochraceous; all basitarsi slightly narrower than their respective tibiae; 2nd submarginal cell slightly shorter than 3rd, receiving 1st recurrent slightly basad of middle; abdominal terga smooth but dull, apical depressed areas rather narrow and shallow, becoming yellowish-hyaline along rims, punctures of discs fine but rather deep and distinct, rather sparse medially, becoming somewhat closer toward sides, discal pubescence very short, suberect, entirely pale, terga 2-4 with distinct, ochraceous, apical fasciae, that on tergum 2 slightly interrupted medially, tergum 5 with a quite dense, apical, ochraceous fimbria.

MALE. Length 8 mm.; face slightly longer than broad, eyes slightly convergent below; clypeus pale yellow, apical margin and two small lateral spots blackish, rather strongly convex, projecting about one-third below suborbital line, smooth, deeply and distinctly but somewhat sparsely punctate, punctures closer laterally; space between margin of vertex and lateral ocelli less than their diameter; cheeks subequal to eyes in width, rounded posteriorly, rather dull, closely but very finely punctate; malar space extremely short; basal segment of flagellum subequal to 2nd and 3rd combined; process of labrum rather small, broad but quite short, broadly subtriangular, the apex rather narrowly truncate and slightly emarginate; pubescence of entire body pale ochraceous; thoracic integument dull, rather densely tessellate, punctures of scutum shallow, rather obscure, rather close anteriorly, but becoming quite sparse posteriorly, those on scutellum about equally fine, rather widely separated; pleura more densely tessellate, punctures very obscure; enclosure of propodeum rather uniformly subrugose; basitarsi slender and elongate, considerably narrower than their respective tibiae; 2nd submarginal cell somewhat shorter than 3rd, receiving 1st recurrent near middle; abdominal terga dull, microscopically tessellate, apical margins but very slightly depressed, concolorous with remainder of discs except for the very narrow apical rim, punctures of discs rather uniformly minute and sparse, pubescence of discs short, thin, erect, entirely pale, terga 2-4 with fairly dense, ochraceous, apical fasciae, that on tergum 2 rather widely interrupted medially; apical portion of sternum 8 rather slender and elongate, with a low median projection, rather thinly pubescent from this to the slightly expanded, subtruncate tip which is very slightly incised medially; penis valves broadly expanded basally, excavated laterally beneath this expansion, gonocoxites quite broadly expanded apically, gonocoxal lobes slightly produced, narrowly rounded.

DISTRIBUTION. Illinois and Michigan, to Connecticut, south to Virginia and North Carolina; March to May.

FLOWER RECORDS. Brassica, Dentaria, Prunus and Stellaria. Robertson (1929) records this also on Arabis, Capsella, Cardamine and Claytonia.



Described using the synonymous name: Andrena brassicae

MALE. Length 8 mm.; face slightly longer than broad; clypeus very slightly convex, projecting slightly less than one-half below suborbital line, yellow, except for two black spots, a dark apical rim and some intrusion of black laterally from adjacent areas of face; space between margin of vertex and lateral ocelli subequal to their diameter; cheeks subequal to eyes in width, rounded posteriorly, being widest just opposite upper end of eye, rather dull, punctures exceedingly close, minute and obscure; malar space very short; basal segment of flagellum slightly longer than 2nd and 3rd combined; process of labrum broad and rather short, narrowed apically to the shallowly emarginate apex; mandibles rather short, with a distinct, inner, subapical tooth, overlapping but very slightly; pubescence of head, thorax and legs entirely whitish; thoracic integument dull, quite densely tessellate, punctures of scutum exceedingly minute and obscure, rather sparse even anteriorly, those on scutellum hardly evident; pleura without evident or distinct punctures; dorsal area of propodeum oblique, triangle short and very broad, very finely subrugose; basitarsi slender and elongate, considerably narrower than their respective tibiae; 2nd submarginal cell somewhat shorter than 3rd, receiving 1st recurrent just basad of middle; abdominal terga dull, quite densely tessellate, impunctate, apical, impressed areas very shallow and obscure, quite narrow, becoming narrowly yellowish hyaline along rims, discal pubescence rather thin and sparse, but rather long and erect, entirely pale, terga 2-4 with thin, loose, whitish, apical fasciae, evident laterally but widely interrupted medially; apical margin of sternum 6 somewhat reflexed; apical portion of sternum 8 slender and elongate, sides nearly parallel, apex narrow, slightly incised medially, clothed beneath with short, pale pubescence; penis valves slender apically, somewhat dilated toward base, deeply grooved laterally toward base, gonocoxites rather abruptly dilated toward apex, resulting lobes rather narrowly rounded apically, gonocoxal lobes somewhat produced, rather broadly rounded.

TYPES. Holotype: Male, Arlington, Va., Apr. 14, 1946 (R. Bohart, on mustard) [Bohart]. Paratype: 1 M, Ithaca, N. Y., April 19, 1941 (Howard E. Evans) [Cornell].



Andrena scurra X arabis X capricornis hybrids

Reprinted with permission of the American Entomological Society from: Ribble, D. W. 1974. A revision of the bees of the genus Andrena of the Western Hemisphere. Subgenus Scaphandrena. Transactions of the American Entomological Society 100: 101-189.

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

The names listed above are junior synonyms (A. arabis, capricornis and scurra are all older names) and have hybrid holotypes. The hybrids treated in this section are those specimens which are distinctly intermediate between two or all three of the parental species (arabis, capricornis and scurra). The hybrids are often very variable at a single locality or between nearby localities. It would be very difficult to use Latin names for such populations. See Ribble (1973) for further details about this hybridization in Scaphandrena and for range maps.

Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Apiaceae  Zizia aurea @ CUIC_ENT (1)
Asteraceae  Solidago @ AMNH_BEE (4)

Taraxacum campylodes @ CUIC_ENT (11)

Tussilago farfara @ CUIC_ENT (2)
Brassicaceae  Barbarea vulgaris @ AMNH_BEE (1); CUIC_ENT (670)

Barbarea @ CUIC_ENT (4)

Brassica sp @ UCMS_ENT (3)

Cardamine bulbosa @ AMNH_BEE (1)

Cardamine concatenata @ AMNH_BEE (1); CUIC_ENT (37)

Cardamine diphylla @ CUIC_ENT (61)

Cardamine hirsuta @ UCMS_ENT (2)

Dentaria @ CUIC_ENT (16)
Buxaceae  Buxus @ CUIC_ENT (3)
Liliaceae  Erythronium americanum @ CUIC_ENT (2)
Melianthaceae  Trillium grandiflorum @ CUIC_ENT (1)
Montiaceae  Claytonia caroliniana @ CUIC_ENT (1)
Ranunculaceae  Hepatica @ AMNH_BEE (1)
Rosaceae  Rosa carolina @ CUIC_ENT (1)

Rubus @ CUIC_ENT (1)

Sorbaria sorbifolia @ CUIC_ENT (1)

Spiraea @ CUIC_ENT (3)
Salicaceae  Salix humilis @ AMNH_BEE (1); CUIC_ENT (1)

Salix @ CUIC_ENT (114)
Sapindaceae  Acer rubrum @ CUIC_ENT (3)

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Updated: 2017-02-24 00:13:50 gmt
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