Extracted from: Snelling R.R., (1990). A Review of the Native North American Bees of the Genus Chalicodoma (Hymenoptera: Megachilidae). Contributions in Science, Number 421, pp. 1-39.|
Known from the female only, this species is sepa-rable from all known American Chalicodoma by the presence of a sharp cariniform ridge parallel to the hypostomal carina. In addition, the head is unusually broad, the eyes are strongly divergent below, and the clypeus is beveled, with the upper lateral lobes projecting as a tooth-like process (Fig. 73) on either side.
FEMALE. Measurements (mm): Holotype HW 4.03; HL 2.97; WL 8.3; TL 10.0.
Head (Fig. 73) about 1.3 times as broad as long; inner eye margins strongly divergent below, lower interorbital distance about 1.3 times upper inter-orbital distance and about 1.4 times eye length; in frontal view, vertex greatly elevated above eyes and ocelli. Mandible slender, apical margin tridentate and about one-fourth as long as lower margin. Hypostomal area, laterad of hypostomal carina, with strong, cariniform ridge extending from outer mandibular base to occipital depression and parallel to hypostomal carina, broad interspace slightly concave, smooth and shiny. Labium broad at base, margins convergent distad. Clypeus protuberant and bifaced (Fig. 74), lower face smooth and shiny, apical margin simple and not covering base of labrum; upper face with middle lobe transverse and slightly emarginate, separated from lateral lobe by shallow emargination, lateral lobe with oblique corniform process; upper face mostly smooth and shiny but with some moderate to coarse, setigerous punctures. Supraclypeal area shiny between fine to mod-erate, contiguous to subcontiguous punctures. Frons, vertex, and preocciput dull, punctures coarse and contiguous; gena similar but with interspaces shiny between moderate punctures. Pedicel longer than first or second flagellar segments, first broader than long; second flagellar segment about 1.3 times longer than first. Interocellar distance about 1.8 times diameter of anterior ocellus and about 0.6 times ocellocular distance; ocelloccipital distance about 1.1 times ocellocular distance.
Pretegular carina of pronotum not extending en-tirely across pronotal lobe. Mesoscutum shiny between contiguous to subcontiguous, moderate to very coarse punctures; scutellum similar but punctures more commonly subcontiguous; mesepister-num similar, punctures mostly contiguous in middle, becoming mostly subcontiguous ventrad; metepisternum and side of propodeum contiguously, finely punctate; propodeal triangle rugo-sopunctate across base, remainder dull and minutely granulose.
Discs of metasomal terga progressively more shiny distad, punctures moderate and contiguous on first, mostly subcontiguous on remaining segments; last tergum dull, contiguously punctate, without preapi-cal groove.
Pubescence about as in other Chelostomoides but clypeus with sparse simple hairs only; pronotal collar and front of mesoscutum without dense, floc-culent, long hairs; first five metasomal terga with dense apical fasciae of short, plumose hairs; disc of sixth tergum with pale hairs; scopa pale, including that of sixth sternum.