AKT. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 21 



The specimens are from the United States National Museum and 

 Bureau of Biological Survey collections. 



PSEN (MIMUMESA) MIXTUS Fox 



Psen mixtus Fox, Trans. Amer. Ent. Soc, vol, 25, p. 7, 1898. 

 Psen alticola Viebeck, Trans. Amer. Ent. Soc, vol. 29, p. 66, 1903. 

 Psen similis IJohwer, Proc. Ent. Soc. Washington, vol. 12, p. 101, 1910. 



I have before me a female specimen that was compared by Mr. 

 Rohwer with the types of mixtus and alticola and found to agree 

 with both, which appears to establish the synonymy as far as these 

 two names are concerned. The synonymy of the third species is 

 based upon a careful examination of the male type of similis in the 

 National Museum, and except for the usual sexual differences it 

 appears certain that it is the same as the two just listed. The trans- 

 verse striation of the upper part of the back of head behind the 

 ocelli is distinctive, but the antennae in the type specimen of sityiilis 

 are broken off, the portion of the single flagellum remaining being so 

 badly immersed in the glue with which it is attached to the card 

 that it is not possible to determine the structure of the segments. 



Length, 7-8 mm. 



Apparently a western species, the recorded localities being Wash- 

 ington State, Moscow, Idaho, Mount Hood, Oreg., and California. 

 The four specimens before me are from the following localities : 

 Florissant, Colo., type male of similis; Fort Collins, Colo. ; Laggan, 

 Alberta, Canada, June 12, 1928 (O. Bryant) ; Kaslo, British Colum- 

 bia, June 13 (R. P. Currie) ; Canada, no definite locality (Baker 

 collection). 



PSEN (MIMUMESA) PROPINQUUS Kincaid 



Psen propinquus Kincaid, Proc. Washington Acad. Sci., vol. 2, p. 508, 1900. 



This species, of which I have examined the type specimen (no. 

 5314) in the National Museum, is very similar to leucopus, the male 

 being distinguished mainly on the characters cited in the key. The 

 Museum collection contains a female named by RohAver which is in 

 rather poor condition, the antennae being entirely missing and the 

 face coated with some sort of sticky substance. Fresh material from 

 Alaska that may belong here shows the character of the pygidium 

 cited in the key and suggests the probability that this is the true 

 female of the species. 



Length, 8-9 mm. 



Type locality. Fox Point, Alaska; female, Port Chester, Alaska 

 (Wickham). 



Other localities: Fairbanks and Anchorage, Alaska (J. M. 

 Aldrich). 



