Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1985. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XI. Minor subgenera and subgeneric key. Transactions of the American Entomological Society 111: 440-567.
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This is a relatively rare Rocky Mountain species of Conandrena in which the elongated head is not quite as well developed as it is in its eastern relative, A. bradleyi. Both sexes of cheyennorum can be separated from those of bradleyi by the shorter malar space and the more distinct metasomal tergal apical pale banding.
FEMALE. MEASUREMENTS AND RATIOS: N = 5; length, 9-10 mm; width, about 3.0 mm; wing length, M=3.66±0.513 mm; FL/FW, M= 1.40±0.008; FOVL/FOVW, M=4.26±0.074.
INTEGUMENTAL COLOR. — Black except as follows: mandible with apical third and base rufescent; flagellum dark reddish brown below; tegula rufescent; wing membranes hyaline, yellow, veins red to orange; metasomal terga 2-4 with apical areas rufescent to hyaline; sternal apical areas hyaline; distitarsi rufescent; tibial spurs yellow.
STRUCTURE. — Antennal scape as long as following three and one-half flagellar segments; segment 2 slightly shorter than segment 3, broader than long; median flagellar segments longer than broad. Eyes each about four and one-half times as long as broad, inner margins parallel. Malar space long, shortest length about one-third of basal mandibular width, shiny. Galea long, broad, shiny. Maxillary palpus moderately long, segmental ratio about 0.7:1.0:0.7:0.6:0.5:0.5. Labial palpus with elongate flattened first segment, ratio about 1.0:0.6:0.5:0.5. Labral process broader than long, trapezoidal, apex often weakly emarginate, shiny; labrum below process shorter, less than half as long as process, punctate. Clypeus elongate, slightly less than half of length protrudes beyond line at lower margins eyes, surface flat and at same level as supraclypeal area; punctures irregularly distributed, separated by half to two puncture widths, without median impunctate line; surface shiny, weakly or not at all shagreened. Supraclypeal area with small crowded punctures and shagreening dulling surface. Face above antennae with fine longitudinal rugae and interrugal punctures. Facial fovea narrow, extending below to barely beyond line at lower margins antennal fossae, separated from lateral ocellus by slightly less than one ocellar diameter. Vertex above lateral ocellus equals slightly less than one ocellar diameter, opaque, tessellate. Genal area slightly broader than narrow eye in profile (about as 5:4), surface shiny, with small punctures.
Pronotum as in bradleyi. Mesoscutum punctured as in bradleyi but shiny, shagreening weak and peripheral. Scutellum shiny. Metanotum and propodeum as in bradleyi. Fore wing with vein 1st m-cu meeting second submarginal cell at middle of cell or somewhat beyond middle.
Metasomal tergum 1 with apical area punctures small but distinct separated by one to two puncture widths; basal area punctures small, separated by two to three puncture widths; surface shiny, weakly or not at all shagreened. Terga 2-4 similar but progressively more densely shagreened, tergum 4 dull. Pygidial plate V-shaped, apex acute, raised internal triangle present. Sterna sculptured as in bradleyi.
VESTITURE. — Pale ochraceous except as follows: dorsum of thorax bright ochraceous; basitarsi with inner surfaces pale yellow; basitibial plate of hind leg with brown hairs; terga 5 and 6 with golden yellow hairs. Terga 2-4 with distinct pale apical fasciae, usually narrowly interrupted on tergum 2 and occasionally on 3. Pollen-collecting hairs as in bradleyi.
MALE. MEASUREMENTS AND RATIOS. — N = 1; length, about 9.0 mm; width, about 2.0mm; wing length, 3.48 mm; FL/FW, 1.30; FS1/FS2, 1.09.
INTEGUMENTAL COLOR. — As in female except clypeus yellow with dark apical margin, dark maculae at tentorial pits, and narrow posterior infuscation (about as wide as dark apical margin or narrower).
STRUCTURE. — Antennal scape as long as first two flagellar segments or slightly shorter; flagellar segment 1 slightly longer than segment 2, which is longer than broad. Eyes each four times as long as broad or slightly less, inner margins converging slightly toward vertex. Malar space, maxillary palpus, labial palpus, and galea as in female. Labral process as in female but more deeply emarginate (bidentate); labrum as in female. Clypeus with small round punctures separated by one to three puncture widths, without median impunctate line; surface shiny, weakly shagreened. Supraclypeal area, face above antennae, vertex, and genal area as in female.
Pronotum as in female. Thoracic sculpturing as in female, but propodeal dorsal enclosure granular throughout. Wing venation as in female.
Metasomal terga 1-5 sculptured as in female terga 1-4; apical areas more broadly hyaline. Sterna 2-5 sparsely punctate, moderately shiny, reticularly shagreened. Sternum 6 flat, weakly emarginate, surface dull, shagreened. Terminalia as in figures 99-103. Note the narrower penis valves and the deeply emarginate sternum 7.
VESTITURE. — Entirely white to pale ochraceous; terga 2-5 with narrow but distinct pale apical fasciae interrupted medially on terga 2 to 3 or 4; sterna 2-5 with weak subapical fimbriae of short white hairs.