114 



PROC. ENT. SOC. WASH., VOL. 23, NO. 5, MAY, 1921 



Cephas sp. (subsequently determined as Cephus cinctus Norton) 

 boring the stems of wild grasses and grain at Salt Lake City and 

 Kimballs, Utah. In addition to the type material there are 

 now in the National collection eleven specimens reared from 

 Cephus cinctus at Missoula, Montana, and determined by the 

 writer as Pleurotropis utahensis. 



The different host records for the holotype and the paratypes 

 are ground for suspicion that the latter may represent a different 

 species. If so, however, Mr. Crawford who compared them 

 when describing the species failed to find characters to separate 

 them. Apparently also Mr. Girault, who saw all of the material, 

 accepted it as all belonging to the same species. Otherwise it is 

 to be presumed that he would have proposed a new specific 

 name for the paratypes. After a careful re-examination of all 

 the material and despite the antennal differences discussed 

 later, the writer is still of the opinion that all represent the same 

 species. As in all such cases unsupported by careful biological 

 studies the question of whether one or more species is repre- 

 sented in a given lot of material is merely a matter of personal 

 opinion. 



FIG. 1 Pleurotropis utahensis Crawford. A, B, C, and D, female antennae 

 illustrating variations. E, male antenna. 



As shown by the accompanying figures which illustrate 

 antennae taken from tour different females and mounted in 

 balsam there is considerable variation in the antennal characters 



