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"
Chelostomopsis lutzi Cockerell, 1930, Am. Mus. Nov., 397: 2, Y.
This species is known, only from the unique type; additional material may well show timberlakei to be a subspecies of it. It is interesting to note that solida falls between lutzi and typical timberlakel not only in structure but also in distribution.
Female: Similar to timberlakei solida but notches separating median from lateral lobes of clypeus deeper, so that median lobe is about as long as broad; lateral lobes correspondingly longer, so that relation of lobes to one another is not altered; cheeks broader than eyes, seen from side. Length 6 1/2 mm.
Type: Female; Mesa Verde, Colorado, in collection of the American Museum of Natural History.