Taken from: LaBerge, W. E. 1987. A revision of the bees of the genus Andrena of the Western Hemisphere. Part XII. Subgenera Leucandrena, Ptilandrena, Scoliandrena and Melandrena. Transactions of the American Entomological Society 112 (3): 191-248.
War Bonnet, Sioux County, Nebraska. May 27, 1901. (M.A. Carriker.)
Female.- Length, 9.5mm. Black, with grayish white hair, very faintly yellowish on thorax above. Facial quadrangle much broader than long. Process of labrum rounded at end, the sides strongly concave. Clypeus minutely granular, with small not dense punctures. Facial foveae seen from above white, quite broad, ending below at about level of top clypeus. Flagellum except at base rather bright re beneath. Third antennal joint shorter than next three combined. Mesothorax dull, not distinctly punctured, somewhat shinning posteriorly. Scutellum shining. Area of mesothorax coarsely roughened, scarcely defined, nearly all the metathorax covered with hair. Tegulae reddish. Wings reddish, stigma and nervures ferruginous. Basal nerve meeting transverse median. Second submarginal cell receiving first recurrent nerve near its end. Hair of hind tibiae shining white; hair on inner side of hind tarsi creamy white. Abdomen shining, not punctured, narrow hind margins of segments testaceous. Second segment in middle depressed about one-third. Segments 2 to 4 with white hair bands, that on 2 interupted in middle. Hair at apex pale grayish brown. Rather like A. campanulae from samr locality, but easily distnguished by the broad face, color of nervures, ect.
[This appears to be a race or subspecies of A. sapellonis Cockerell, from which it difffers by the clearer, reddish hair at apex of abdomen, and absence of a smooth keel in the middle of the clypeus. Superficially, it is just a specimen of A. nudiscopa Viereck (det. Viereck) from Fort Collins, Colorado, June 12, 1990 (Gillette); but the abdomen is brilliantly shining in trapezoidina, perfictly dull in nudiscopa.]
Type.- Entomological collection of the University of Nebraska.