Reprinted from Viereck, H.L. 1917. New Species of North American Bees of the Genus Andrena Contained in the Collections ofthe Academy of Natural Sciences of Philadelphia. Transactions of the American Entomological Society 43: 365-407. The copyright on this work has expired.
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TYPE. — No. 4055, The Academy of Natural Sciences of Philadelphia.
TYPE LOCALITY. — Southern California. (H. K. Morrison.)
Related to A. (A.) illinoensis Robertson.
FEMALE. — Length 8.5 mm.; body black, with the head and abdomen barely tinged with green, mostly covered with whitish hairs, head with its facial line : transfacial line :: 45: 64, axial line : temporal line :: 27:15, malar line : joint 3 of antennae :: 2: 8, ocelloccipital line : greatest diameter of lateral ocellus :: 4: 4, elevated portion of malar space nearly as long as depressed portion, head covered with whitish hairs, front rather distinctly, longitudinally striate, not elevated into a welt along the fovea, fovea at most : ocellocular fine :: 7:14, foveal band present and at upper end of the inner eye margin: ocellocular line : 1.5 : 14, distance between fovea and ocelli : ocellocular line :: 7:14, fovea attenuated below its middle where it is apparently only one-half or a little more than half as wide as the greatest width of the fovea, the latter continued to a point apparently on the antennal line, fovea filled with dark seal brown hairs except along the lower edge where the hairs are pale, vertex and temples along the upper edge of the eye with some dark hairs, face mostly dullish, finely, distinctly reticulate, with rather ill-defined punctures that are as many as three puncture widths apart, clypeus distinctly elevated above the apical margin, slightly convex, sculptured like the face except that the punctures are better defined and not so close together, clypearea present but poorly defined, clypeus thinly hairy, its sculpture not at all hidden by hairs, labrarea subemarginate, its width at base : length down the middle :: 9:2.5, width at apex : length down the middle :: 5.5: 2.5, greatest length : width at base :: 3:9, labrarea at base apparently a little more than half as wide as the labrum, the latter with a fringe of golden hairs, labrum without definite sculpture or structure between the labrarea and apical edge of labrum, joint 3 of antennae : 4 5 :: 8: 7, joints 4 and 5 thicker than long, the succeeding joints as thick as long or a little longer than thick except joint 12 which is distinctly longer than thick, antennae blackish throughout, mandibles typical, robust, extending nearly to the outer edge of the labrarea, black except for the apical third which is mostly dark reddish, palpi nearly typical; thorax thinly covered with whitish hairs which are as long on the dorsulum as the almost white hairs on the mesopleura, dorsulum dullish, finely reticulated, indistinctly punctured, the punctures sparser than on the clypeus, notauli represented by a shiny line, mesopleura sculptured somewhat like the dorsulum but more closely punctured, the punctures crater like, scutel hairy and sculptured much like the dorsulum, metanotum hairy and sculptured like the dorsulum except that the sculpture is denser and less distinct, tegulae dark brown, polished, wing base partly blackish brown, sub costa blackish brown, stigma pale brownish stramineous, rest of veins dull stramineous, with a blackish tinge, first recurrent vein received by the second submarginal cell in or a little beyond the middle and nearly as near to the second transverse cubitus as the first transverse cubitus is to the stigma on the radial vein, nervulus interstitial and forming an acute angle with the first abscissa of the discoidal vein, membrane uniformly tinged with brown, legs blackish except for the tarsi which are more or less light brown, legs covered with whitish and golden brown hairs, scopa atypical, its hairs whitish and brownish, at most apparently shorter than the greatest width of hind tibiae, mostly nearly erect not hiding the tegument, hairs at base above decidedly darkened, hind metatarsi at most apparently a little wider than middle metatarsi, more than half as wide as hind tibiae at apex; propodeum with its enclosure poorly defined, dullish and finely reticulated, rest of upper face of propodeum sculptured somewhat like the enclosure, apparently more finely, and covered with whitish hair, propodeal pleura with a few sparse, shallow, crater-like punctures, finely reticulated, shiny, and almost hidden by the almost white floccus; abdomen with its tergum shiny, finely reticulated and almost impunctate, the indistinct punctures from two to six or more puncture widths apart on the first tergite, the punctures apparently sparser on the succeeding tergites, second, third and fourth tergites with an apical, whitish hair band that is interrupted in the middle, apical edge of first, second, third and fourth tergites with a stramineous border, second tergite with its elevated portion down the middle : depressed portion :: 15: 6, fifth tergite shiny, reticulate, its punctures distinct and apparently closer together than on the other tergites, pygidium slightly convex, apparently without a shallow furrow on each side, nearly pointed at apex, black, tergum with inconspicuous pale nearly erect hairs in addition to the hair bands, fimbria dull pale brownish or whitish with a brownish tinge.
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