Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1980. A revision of the bees of the genus Andrena of the Western Hemisphere. Part X. Subgenus Andrena. Transactions of the American Entomological Society 106: 395-526.
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Andrena durangoensis is known from a few specimens from Colorado and New Mexico and is not closely related to any of the species of Andrena described above; The female is similar to that of darker specimens of hemileuca or vicinoides in the elongate facial quadrangle and the color of the vestiture, but differs in the longer apical areas of terga 2 and 3, the shiny clypeus which lacks shagreening even basally, and the shiny punctate supraclypeal area; The male lacks the basal inferior mandibular teeth, as does the female, has the same shiny clypeus and supraclypeal area, and has the sixth sternum reflexed along the apical margin.
FEMALE. MEASUREMENTS AND RATIOS. — N = 2; length, about 12 mm; width about 3 mm; wing length, 4.38 ±4.45 mm; FL/FW, 1.01-1.06; FOVL/FOVW, about 3.00.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical half rufescent; flagellar segments 2-10 reddish-brown below; tegula translucent, reddish-brown; wing membranes slightly infumate, yellow, veins reddish-brown; distitarsi rufescent; tibial spurs brown; metasomal terga with apical areas translucent, rufescent; sterna 2-5 with apical areas hyaline, yellow.
STRUCTURE. — Antennal scape length equal to first three flagellar segments; flagellar segment 1 slightly longer than segments 2 plus 3; segment 2 about as long as 3, longer than broad; Eyes each about four times as long as broad, inner margins parallel; Mandible as in vicinoides but without basal inferior tooth; Malar space short, minimum length one-fourth as long as basal mandibular width; Galea as in hemileuca but shiny except near apex; Maxillary palpus as in frigida but segmental ratio about as 0.8:1.0:0.8:0.8:0.6:0.6; Labial palpus as in frigida but ratio about as 1.0:0.7:0.6:0.6; Labral process trapezoidal in outline, bidentate, reflexed, shiny; labrum apical to process convex with weak median crista; Clypeus relatively flat, elongate, with irregularly sized punctures separated by half to two or more puncture widths, with median impunctate line; surface shiny, unshagreened even at base and laterally; Supraclypeal area with minute round punctures, surface shiny, unshagreened; Face above antennal fossae with longitudinal rugulae and distinct interrugal punctures; Facial fovea shallow, extending below to below line at lower margins antennal fossae, above separated from lateral ocellus by slightly less than one ocellar diameter; Vertex above lateral ocellus equals slightly less than one ocellar diameter, dulled by dense tessellation and fine punctures; Genal area in profile slightly broader than eye (about as 6:5), shiny with sparse punctures and weak shagreening in posterior half or less
Thoracic form and sculpturing as in hemileuca and vicinoides except as follows: mesoscutum posteromedially with punctures more evident, although obscured by fine tessellation, separated mostly by one puncture width; scutellum shiny with abundant punctures especially along midline and posteriorly
Metasomal tergum 1 moderately dulled by coarse reticular shagreening, basal area punctures separated mostly by two puncture widths or more; Terga 2 and 3 with apical areas long, medially more than one-third of median tergal length but less than half; surfaces with punctures distinct but sparse, separated mostly by three or more puncture widths, reticularly shagreened but shinier than tergum 1, apical areas shinier than basal area; Tergum 4 similar to 2 but apical area medially equals half of tergum or almost so; Pygidial plate narrowly V-shaped with rounded apex; Sterna dull, shagreened and punctate as in vicinoides.
VESTITURE. — Head white except brown on mandibular bases, labrum, clypeus, facial fovea and vertex; Thorax pale or ochraceous; legs dark brown except as follows: femora white in part or entirely, hind trochanteral flocculus white; Metasomal vestiture dark brown except as follows: tergum 1 white; tergum 2 with basal area white and brown mixed; terga 2 and 3 with apical areas fringed by weak white fasciae; Pollen-collecting hairs as in vicinoides.
MALE. MEASUREMENTS AND RATIOS. — N = 3; length, 9-11 mm; width, about 2 mm; wing length, 3.65-4.05 mm; FL/FW, 0.92-0.99; FS1/PS2, 1.00-1.08.
INTEGUMENTAL COLOR. — As in female but mandibles with only tips rufescent.
STRUCTURE. — Antennae and eyes as in hemileuca; Mandible as in vicinoides but without basal inferior angle or tooth; Malar space, galea, maxillary and labial palpi as in female; Labral process as in female but more strongly reflexed or bowed out; labrum apical to process without crista; Clypeus flat, apical margin shallowly emarginate medially, with narrow impunctate midline and sparsely punctate subapical area, punctures separated largely by half to one puncture width; surface shiny, unshagreened even at base and laterally; Supraclypeal area minutely punctate, shiny to moderately shiny; Face above antennal fossae and vertex as in female; Genal area in profile about twice as broad as eye, with small punctures separated by two to four puncture widths except crowded near eye margin, surface shiny unshagreened; Thoracic form and sculpturing as in female except as follows: pronotum with humeral angle and ridge more distinct, surface posterior to ridge shiny; propodeal dorsal enclosure roughened at base; Metasomal terga 2-4 with apical areas about as long medially as one-third median tergal length; Tergal sculpturing as in female but shinier; Pseudopygidial area of tergum 7 distinct, blunt at tip; Sterna 2-5 sculptured as in hemileuca or vicinoides; Sternum 6 with apical margin reflexed, without emargination (that is, reflexed margin not forming lateral teeth).
Terminalia as in figures 122-126.
Reprinted with permission from: Mitchell, T.B. 1960. Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
MALE — Length 11 mm.; clypeus broad and rather flat, projecting but little below suborbital line, smooth and shining, with fine, evenly distributed, well separated punctures; lateral ocelli separated from margin of vertex by a space about equal to their diameter; cheeks extremely broad, with a rounded posterior angle opposite middle of eye, smooth but rather dull, with minute, well separated punctures; malar space well developed, equaling about one-third basal width of mandible; basal segment of flagellum subequal to the following segments; process of labrum broad and very short, quite deeply emarginate; mandibles elongate, slender, somewhat flexed medially, with an obscure, inner, subapical tooth, overlapping nearly one-half; pubescence of head, thorax and base of abdomen entirely pale ochraceous, rather long but not very dense; thoracic integument dull, tessellate, scutum, and scutellum with some barely visible, well separated punctures; enclosure of propodeum smooth; all basitarsi long and slender, considerably narrower than their respective tibiae; 2nd submarginal cell much shorter than 3rd, receiving 1st recurrent vein at center; abdomen narrow and elongate, the terga somewhat shining, with scattered, sparse, exceedingly minute punctures, apical margins slightly and narrowly depressed, faintly reddened, pubescence very short, thin and erect, entirely pale, without visible fasciae; sternum 8 gradually narrowed apically, with a low, submedian, ventral protuberance which bears a dense tuft of pubescence, slightly constricted beyond this to the rounded tip; penis valves expanded basally, excavated beneath this expansion, gonostyli rather broadly dilated apically, gonocoxal lobes strongly produced and narrowly rounded.
DISTRIBUTION — Colorado to North Dakota, east to Michigan, New York, the New England states, Nova Scotia and south to West Virginia; May to September.
FLOWER RECORDS — Ilex and Rubus.
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