ZooL.— Vol. II.] WHEELER— DOLICHOPODIDM. 47 



Eight males and three females taken during August and 

 September, 1895, at various localities in Wyoming, from 

 Lusk to Hunter's Creek in the Wind River Mts. The 

 species seemed to occur most frequently in the latter locality 

 at an altitude of from 7,000-8,000 feet. 



The antennae resemble those of P. emarg-inatum, but the 

 third joint is broader, less pointed, and the arista is inserted 

 much nearer the base in P. montivagum. 



Sympycnus Loeiv. 



The genus Symfycnus as originally defined by Loew 

 really includes, I am convinced, two groups of forms which 

 are worthy of separation as distinct genera. One group, 

 corresponding very closely with Sympycnus as defined by 

 Kowarz,^ comprises species with small third antennal joint, 

 plain arista and the first joint of the fore tarsi in both sexes 

 longer than the fifth. To this group belong Loew's S. 

 tertianus from Alaska, and S. lineatus from the Middle 

 States, Aldrich's S . falco and S . stmilis from St. Vincent 

 and three new species from the Western States. The other 

 group, to which I assign Loew's S . frontalis and S . nodatiis 

 and four new western species, all agree in having the third 

 antennal joint much larger than that of the former group, 

 the arista usually more or less thickened and elongated in 

 the male, and the first joint of the fore tarsi shorter than 

 the fifth in the same sex. To this group I have given the 

 name Nothosym-pycnus, In most other characters the gen- 

 era agree but the above mentioned differences are even 

 greater than those which separate such well-founded genera 

 as Dolichofus and Hygroceleuthus, genera which are also 

 separated on secondary sexual characters only. Only the 

 males are included in the following table of Sympycnus 

 (sens, str.) : — 



iDie E;uropaischen Arten d. Dipteren-Gattung Sympycnus I,oew. Wien. Ent. Zeitg., 

 vni, Jahrg. 5, Heft. 31, Mai, 1889. 



