Reprinted from Viereck, H. L. 1917. New species of North American bees of the genus Andrena from west of the 100th meridian contained in the collections of the Academy of Natural Sciences of Philadelphia. Proceedings of the Academy of Natural Sciences of Philadelphia 68 (3): 550-608. The copyright has expired on this work.
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TYPE. — No. 4048. The Academy of Natural Sciences of Philadelphia.
TYPE LOCALITY. — California
Related to A. (A.) saccata Viereck
FEMALE. — Length 13 mm; body black, mostly covered with black hairs; head with its facial line : transfacial line :: 73 : 98, axial ling : temporal line :: 39 : 26, malar line : joint 3 of antennae :: 4:14, elevated portion nearly as long as depressed portion, head covered with black or reddish hairs except for some pale hairs on the vertex, front more reticulate that straight, not elevated along the inner foveal edge, fovea at most : ocellocular line :: 18 : 24, foveal band wanting, fovea virtually contiguous to the upper end of the inner eye margin, distance between fovea and ocelli : ocellocular line :: 5 : 24, fovea hardly constricted near its middle where it is apparently nearly as wide as the greatest width of the fovea, the latter continued below the middle as a narrowing shallow impression down to a point distinctly below the clypeal line, fovea very dark seal-brown, face shining, finely reticulated and rather distinctly punctured, the punctures one to three puncture widths apart, clypeus slightly elevated above the apical margin, convex, sculptured much like the face but more shining and more distinctly punctured, clypearea wanting, clypeus densely hairy laterally where its surface is nearly hidden by hairs, labrarea rounded, its width at base : length down the middle :: 20 : 5, convex at apex, labrarea at base at least two-thirds as wide as the labrum, the latter with two thirds of brownish hairs, joint three of antennae : 4 5 :: 14 : 11, joint 4 nearly as thick as long, the succeeding joints as long or a little longer than thick, the end joint distinctly longer than thick, antennae blackish throughout, mandibles typical, robust, extending to the outer edge of the labrum, black except for the apical half which is partly dark reddish, palpi nearly typical; thorax covered with an abundance of slender hairs which are ochreous on the dorsulum where they are a little shorter than the blackish hairs on the mesopleurae, dorsulum dullish, finely reticulated and closely punctured with rather indefinite punctures, notauli represented by a shining line, mesopleurae with blackish hairs, except along the upper margin where the hairs are concolorous with the hairs of the dorsulum, scutel hairy and sculptured much like the dorsulum except for being less finely sculptured, metanotum hairy and sculptured like the dorsulum except that the sculpture is coarser, tegulae dark brownish stramineous, reticulated and shiny, wing base partly blackish brown, subcosta blackish brown, stigma pale stramineous with a blackish tinge, rest of veins dull brownish stramineous, with a blackish tinge, first recurrent vein received by the second submarginal cell a little before, in or a little beyond the middle and as near or nearer to the first transverse cubitus as the first trans cubitus is to the stigma on the redial vein, nervulus interstitial and forming an acute angle with the first abscissa of the discoidal vein, legs blackish brown except for the tarsi which are more or less brownish stramineous, legs covered with blackish or dark brown hairs, scopa typical, its hairs of a blackish brown hue and concolorous throughout, hind metatarsi at most apparently as wide as mid metatarsi; propodeum with its enclosure poorly defined, finely reticulated, not at all rugose, rest of upper face of propodeum sculptured somewhat like the mesopleurae but covered with ochreous hair, propodeal pleurae finely reticulate and with sparse indefinite punctures, not hidden by the poorly developed blackish floccus; abdomen with its tergum shining, finely reticulated and finely punctured, the punctures poorly defined and from two to six or more puncture widths apart on the first tergite, second, third and fourth tergites sculptured much like the first tergite, second tergite with its elevated portion down the middle : depressed portion :: 29 : 10, fifth tergite with its sculpture of the same kind as the preceding tergite, pygidium black, almost planate and nearly pointed at apex, dullish, without an enclosure, tergum with rather conspicuous blackish hairs, second, third and fourth tergites without a hair band, fimbria blackish brown. A paratopotype has the hair of the dorsulum and scutel reddish and the labrarea truncate, the truncature as wide as the length of the labrarea down the middle.
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