Reprinted with permission of the American Entomological Society from:
LaBerge, W. E. 1971b. A revision of the bees of the genus Andrena of the Western Hemisphere. Part IV. Scrapteropsis, Xiphandrena, and Rhaphandrena. Transactions of the American Entomological Society 97: 441-520.
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This small black species is known only from the type, a female from southern California. This female is similar to A. biareola in having only two submarginal cells and resembles A. aquila in having the vestiture entirely black. It can be distinguished from biareola by the black vestiture, the weakly punctate tergal apices and the weakly formed pronotal humeral angle. It differs from aquila by the two submarginal cells, the form of the pronotum as described below, the narrower labral process and the weakly punctate tergal apices.
FEMALE. MEASUREMENTS AND RATIOS. — N = 1; length, about 9 mm; width, about 2.75 mm; wing length, about 3.53 mm; FL/FW, 0.94; FOVL/FOVW, 4.36.
INTEGUMENTAL COLOR. — Black except as follows: mandible with tip rufescent; flagellum below dark blackish-brown; tegulae dark; wing membranes infumate, brown, veins dark brown; tibial spurs brown: distitarsi slightly rufescent.
STRUCTURE. — Antennae as in stipator. Eyes each almost three and one-half times as long as broad, inner margins parallel. Malar space mandible and galea as in imitatrix. Maxillary and labial palpi not visible. Labral process as in stipator, extremely narrow apically and entire: labrum as in stipator, Clypeus as in stipator but median impunctate line absent. Supraclypeal area as in stipator. Genal area laterally broader than eye (about as 3: 2.5), sculptured as in stipator but ventrally with strong rugulae converging towards mandibles (but not bent apically). Vertex as in stipator. Face above antennal fossae opaque, with crowded, contiguous punctures, rugae present only laterally near foveae and weak. Facial foveae as in stipator.
Pronotum with extremely weak humeral angles, ridge below angle absent, area below angle with several weak, short, dorsoventral rugulae, sparsely punctate. Mesoscutum and scutellum sculptured as in stipator but anterior third of mesoscutum with punctures separated mostly by half a puncture width. Propodeum and mesepisternum as in stipator. Wing venation as in biareola. Legs as in stipator.
Metasomal tergum 1 with basal area with sparse round punctures separated mostly by two to four puncture widths; apical area with punctures more distinct, crowded. Tergum 2 with apical area about equal to basal area in length medially; apical area almost impunctate, with extremely sparse, minute punctures; basal area with scattered punctures separated irregularly by one-half to two puncture widths; surface shiny, weakly shagreened. Terga 3 and 4 similar to 2. Pygidial plate and sterna as in stipator.
VESTITURE. — Entirely black including scopal hairs. Distribution and form of hairs as in stipator.
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