The Taxonomic Status of Two North American Lithurge (Hymenoptera: Megachilidae)
Subsequent to my 1983 review of the North American species of Lithurge, the type specimen of L. planifrons (Friese) has been examined: it is a senior synonym of L. socorroensis (Mitchell) (NEW SYNONYMY). The species that I incorrectly believed to be L. planifrons is here described as L. bitorulosa, no prior name being available. A corrected key to the North American species is included.
Snelling, Roy R.
"The Taxonomic Status of Two North American Lithurge (Hymenoptera: Megachilidae),"
Bulletin of the Southern California Academy of Sciences:
Available at: http://scholar.oxy.edu/scas/vol85/iss1/5