204 U. S. NATIONAL MUSEUM BULLETIN 2 1 6 paet 3 



(separated by about 3 times their diameter) ; occipital carina complete 

 below but not strong; hypostomal carina not very high; mesoscutum 

 and mesosternum of female very sparsely punctate; front tarsus of 

 female very broadly expanded and with very long bristles, as in figure 

 380; ovipositor tip as in figure 328,p. 



There is a Rocky Mountain and a Sierra Nevada subspecies, sep- 

 arable in the female as treated below. Only two males are known: 

 one from Pullman, Washington, June 1921, Doyle Starcher (Pull- 

 man) ; and one from Blanco's Corral, 10,000 ft.. White Mt., Mono Co., 

 Calif., July 1953, N. Malley (Davis). The first male mentioned 

 above we have not seen; it was described by Pratt in his original de- 

 scription of the subspecies symmetricus. This description indicates 

 that the specimen is sunilar in coloration to the female of the sub- 

 species symmetricus. The second specimen is before us. Though it 

 is within the range of the subspecies bilobatus its color is quite differ- 

 ent, being like the male of T. relativus nitschei but with the black 

 more intense, wings a little infuscate, and basal 0.7 of segment 2 of 

 hind tarsus fuscous. It may be that there are other males of the 

 species among the specimens that have passed through the hands of 

 Pratt and ourselves ; if so they were mixed with males of T. relativus. 

 We have been on the lookout for such masqueraders, but found only 

 the single male from Blanco's Corral, described above. Since only 

 two males are known and the characters of one of them do not corre- 

 spond with either of the subspecies as illustrated by females, the sub- 

 specific treatment below is limited to the females. 



1. Coxae black; range: Rocky Mountain area. 



11a. symmetricus symmetricus (Pratt) 



Coxae red; range: Sierra Nevada . . . lib. symmetricus bilobatus (Pratt) 



11a. Trachysphyrus symmetricus symmetricus (Pratt) 



Cryptus symmetricus Pratt, 1945, Amer. Midi. Nat., vol. 34, p. 590; cf, ? . Type: 

 9 , Beaver Range Mts., Utah, 8,000 to 10,000 ft. (Washington). 



Female: Black. Front and hind orbits narrowly white; femora, 

 apical 0.3 ± of first abdominal segment, and all of following abdom- 

 inal segments red; front and middle tibiae and tarsi ferruginous to 

 fuscous; segment 1 of hind tarsus dark brown, its apex paler; segments 

 2-4 of hind tarsus dirty white to brown; segment 5 of hind tarsus 

 light brown; wings blackish. 



Specimens: 9, Banff, Alta., July 1, 1925, Owen Bryant (Washing- 

 ton). 9, Lillooet, B. C, May 27, 1925, E. R. Buckell (Ottawa). 29, 

 Robson, B. C, July 5, 1947, and Oct. 22, 1948, H. R. Foxlee (Ottawa). 

 9, Florissant, Colo., June 1 9, 1907, S. A. Rohwer (Cambridge). 9, "Co- 

 lumbia Mt.," Mont., July 5, 1934, H. T. Rogers (Moscow). 9, 

 Farmington, Utah, June-July, 1944, G. S. Bohart (Townes). 9, Na- 



