Species account taken from: "A Revision of the Genus Ashmeadiella (Hymen., Megachilidae) Author(s): Charles D. Michener Source: American Midland Naturalist,Vol. 22, No. 1 (Jul., 1939), pp. 1-84"
This is a black, sparsely pubescent species, with the sides of the abdomen broadly red. It differs from the several superficially similar species, such as timberlakei, by the unproduced clypeus, the median lobe of the apical margin of which is short and broadly truncated, but little exceeding the reduced lateral lobes. This is the only species of its subgenus in which the mandibles are quadridentate, in which character it resembles Corythochila, to which it might be referred. The mandibular teeth are lower than in Corythochila, however. Female: Facial line much longer than transfacial; inner margins of eyes parallel; clypeus coarsely and not closely punctured, punctures arranged in indefinite longitudinal rows; apex of clypeus with a pair of rather broad, shallow, sublateral emarginations, which differentiate a short, broadly trun- cated median lobe from the rounded lateral lobes which are slightly (or considerably in some paratypes) exceeded by the median lobe; labrum with flattened portion of upper surface polished, apex shallowly emarginate; mandibles quadridentate, the two inner teeth low and rounded; hypostomal cari- nae not produced to teeth behind; cheeks nearly as broad as eyes, seen from side; supraclypeal area, frons, and vertex rather finely and closely punctured; flagellum brownish beneath; anterior ocellus much posterior to midpoint between bases of antennae and posterior edge of vertex; distance between posterior ocelli greater than distance to eye or to posterior edge of vertex) distance between posterior ocelli greater than distance to eye or to posterior edge of vertex. Scutum without spots of pubescence anteriorly, rather finely and closely punctate; scutellum more sparsely and a little more coarsely punctate than scutum; mesepisterna punctured similarly to scutellum; tegulae testaceous; wings slightly dusky; legs dark brownish; inner margin of inner hind tibial spurs finely serrate with about eleven small, oblique teeth, outer margin with about seven long teeth, basad to which are one or two small ones; outer spur with a few low, oblique teeth on each margin. Basal abdominal tergites dorsally with rather fine punctures, separated by less than their widths; punctures larger and coarser on posterior tergites and on sides of tergites, where they are approximate; tergites one to five with lateral thirds and posterior margins red; sixth tergite red laterally; tergites one to four with weak apical bands of white pubescence; scopa yellowish white. Length 6 mm.
Holotype and three paratypes: Ashfork, Arizona, June 17 and 18 (Barber and Schwarz, U. S. N. M.) One paratype is in the author's collection