Extracted from: Snelling R.R., (1983). The North American Species of the Bee Genus Lithurge (Hymenoptera: Megachilidae). Contributioun in Science, number 343, pp. 1-11. The Natural History of Los Angeles County, 1983|
This appears to be an uncommon species. Females may be easily recognized by the combination of two conical protuberances. on the supraclypeal area, the presence of a pubescent fascia on the dorsal margin of the pronotum, and the usually red legs. Males are similar to those of L. apicalis in that both lack labral tubercles, but differ in the narrower supraclypeal area.