Extracted from THE POLLEN-COLLECTING BEES OF THE ANTHIDIINI OF CALIFORNIA (Hymenoptera: Megachilidae) by Grigarick A., A. (1968).
This species is marked with a bright yellow pattern on black. Tergum VII (fig. 168) of the male is simi¬lar in outline to those of ulkei and platyurum but differs by having less setae and sparser punctation. The male genitalia also shows distinct differences in setation of the gonostylus and the penis valves. The female of desertorum resembles parvum and sub-parvum; but the females of parvum and subparvum have an acute preapical tooth on the mandible, whereas this tooth is low and blunt on desertorum.
This species is known only from four specimens limited to the western margin of the Colorado Desert
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