34 PROCEEDINGS OF THE NATIONAL MUSEUM vol 82 



evident raised line on one side. The propodeum under a moderate 

 magnification ( X20) appears granulose and dull, under a high mag- 

 nification ( X 32) the enclosure is seen to be covered with small reticu- 

 lations or rugae, while the adjacent areas outside of it are more 

 striate, becoming reticulate near the downward curve. Pronotum 

 very broadly rounded on each side, practically without the usual 

 lateral angle. Upper mesopleura (eps 2) granulose. Legs black, 

 the bases and apices of all tibiae and most of the fore and mid tarsi 

 brownish yellow. Wings more noticeably whitish hyaline than in 

 any other species, the costal vein up to the stigma yellow, the other 

 veins black. Hind coxae sharply carinate on inner side. 



Length, 7.5 mm. 



Originally described from Montana. The male before me is from 

 Tuttle, Idaho, July 1, 1930, no. 9, S. pestifer. 



PSEN (MIMESA) COQUILLETTI Rohwer 



Plate 1, Figure 20 



Psen {Mimesa) coquUletti Rohwer, Proc. Ent. Soc. Washington, vol. 12, p. 103, 

 1910. ( Female. ) 



Female. — Similar to grarmlosv^, of which I am practically certain 

 it will prove to be the female. Legs almost entirely black, the hind 

 pair entirely so, with white hairs, spines, and spurs. Abdomen with 

 the extreme apex of first and all of second and third tergites red. 

 Wings white, the costal vein much paler than the radius. 



Structurally similar to granulosus, differing strikingly in the 

 structure of the clypeus, the anterior aspect of which is shown in 

 plate 1, figure 20. That there should be a very prominent elevation 

 near the anterior margin in center which is not evident in the male 

 is a normal feature of the sexual dimorphism of the subgenus, 

 though in this species the elevation is much more prominently de- 

 veloped than in any other species now before me, and the submedian 

 teeth are also better developed. The other structures are very similar 

 to those of the foregoing male, except that the petiole is rather 

 shorter and the sternites are of the usual width on anterior margin. 



Length, 8 mm. 



Originally described from a female taken in San Diego County, 

 Calif. I have a female that agrees in all details with the type from 

 Glendale, Nev., October 3, 1929, on Chrf/sofhamnus jmniculatus, no. 

 1119, B-29 (David E. Fox). 



The male which the describer associated with the type does not, I 

 am sure, belong here, as the upper mesopleura (eps 2) is finely but 

 distinctly longitudinally striate instead of merely alutaceous and 

 slightly punctured, as in the female and in granulosus. In all three 

 the hind coxae are rather distinctly carinate on their inner surfaces. 



