56 



U.S. NATIONAL MUSEUM BULLETIN 2 68 



tinct dorsal carina with a medial single minute denticle just below 

 the prominent acute tubercle common to both species; (2) The 

 mandibles of rubripes are unidentate and the mandibles of apicata 

 are bidentate; (3) The pygidium of rubripes is defiinitely rounded 

 apically while in apicata it is truncate with the apical margin some- 

 what emarginate. The distribution of the two species overlap in the 

 central Rocky Mountain area. 



Types. — The lectotype male of E. rubripes Cresson from Colorado 

 (H. K. Morrison) is in the Philadelphia Academy of Natural Sci- 

 ences, no. 1961. The lectotype of E. unicornis Patton is at the Phila- 

 delphia Academy of Natural Sciences. The type male of Aphilanthops 



Figure 34. Western U.S. E, rubripes 

 Cresson 



marginipennis Cameron is at the British Museum of Natural History. 

 The abdomen has been lost. It was taken at Atoyac in Vera Cruz, 

 Mexico (Schumann). 



Distribution. — From southern Alberta S. through the Rocky 

 Mts. into north central Mexico and E. to the Missouri River. 



Prey records. — Peritaxia sp. (Cazier, 2 mi. NE. Portal, Ariz. 

 July 28, 1961) (det. by Miss R. E. Warner). 



Plant records. — Acacia angustissima (Arizona). Argemone sp. 

 (Nebraska). Baccharis glutinosa (Arizona, Mexico). Baileya multi- 

 radiata (Arizona). B. pleniradiata (New Mexico). Compositae (New 

 Mexico). Eriogonum sp. (Arizona). E. annum (Texas). E. thomasii 

 (Arizona). Gutierrezia longijolia (New Mexico). Haploppapus hartwegi 

 (Arizona). Helianthus sp. (Nebraska, Mexico). H. petiolaris (North 



