1960] 
Evans — Bc?nbix u-scripta 
6l 
species is able to live side-by-side with other Be?nbix by virtue of its 
unusual provisioning behavior. Since u-scripta is one of the rarest of 
North American Bembix, I would hesitate to say that its unusual adap- 
tations have proved outstandingly successful. 
A final word on the second problem, that of the specific status of 
arcuata and u-scripta. I find it hard to believe that the wasps which 
I studied at Port Isabel, Texas, and Rodeo, New Mexico, represent 
different species. As indicated earlier, the Texas wasps were colored 
much like the type of arcuata, the New Mexico wasps much like the 
type of u-scripta. However, they were not colored precisely like the 
type of u-scripta and the parameres of male genitalia were more slend- 
er and attenuate than they appear to be in the type of that species. 
The final solution must come from studies farther west, from in and 
around Tucson, Arizona, the type locality of u-scripta. In the mean- 
time I see no reason to abandon my former belief that the two names 
should tentatively be regarded as synonyms. 
Literature Cited 
Evans, H. E. 1957 Studies on the comparative ethology of digger wasps 
of the genus Bembix. Cornell Univ. Press. 248 pp. 
1959 Studies on the larvae of digger wasps (Hymenoptera, 
Sphecidae). Part V: Conclusion. Trans. Amer. Ent. Soc., 85 : 137-191. 
Lohrmann, E. 1948 Die Grabwespengruppe der Bembicinen. Cberschau 
und Stammesgeschichte. Mitt. Munchen. Ent. Ges., 34: 420-432. 
Parker, J. B. 1917 A revision of the bembicine wasps of America north of 
Mexico. Proc. U. S. Nat. Mus., 52: 1-155. 
1929 A generic revision of the fossorial wasps of the tribes 
Stizini and Bembicini. Proc. U. S. Nat. Mus., 75 (art. 5) : 1-203. 
