338 THE CANADIAN ENTOMOLOGIST 



of rr.esopleura and a larger on the sternopleura, the latter, how- 

 ever, opaque below; an opaque black spot on pteropleura and one 

 above hind coxa. Halteres white. The bristles of the thorax 

 are as follows: humeral 2-3; notopleural 3; postalar 1; posterior 

 dorsocentral 1; scutellum 2 pairs, the outer small. 



Abdomen rather uniform subshining brown above, the last 

 segment more or less yellow; the hairs are pale except along the 

 sides apically and on last segment, the male showing more dark 

 then the female; male hypopygium black, shining. 



Legs dark yellow including tarsi, but there is some tendency 

 to a dark ring on hind tibiae and to a vague darkening of the front 

 tarsi and the basal half of hind femora. 



Wing subhyaline, vena- 



>^ tlon as in Chlorops; the dis- 



^-"-^"'"^ -—-^ — y tance between cross veins is 

 /^*^ : 'Z^^-'^^^^^^^'^^'^ from 1}^ to 2 times the hind 



V""''''' y^ ./' Length 2-2.6 mm. 



/^"^^ Eleven males and 



Fig. 19.— Same species, wing. tweuty-two females. The 



male is from Ogema, Sask., 

 June 16, 1916;. Paratypes are from Ogema (6) and Estevan 

 (2), Sask.; Treesbank and Aweme, Man., (18); Sheridan, Wyo., 

 (1, Metz); Pullman, Wash., (1, Melander) ; Bovill, Ida., (1, 

 Melander) ; Powell Co., Mont., (1, Mann); and Saranac Lake, 

 N.Y., (1, Johannsen). 



The type of similis Mall, is in general very similar, but although 

 a female it has the antennae and palpi coloured as in the male of 

 canadensis, and "tibiae darkened from near base, becoming black 

 at apices; tarsi black." 



The European cinctipes, type of the genus, has the same sexual 

 distinctions in the colour of antennae and palpi as in canadensis, 

 or essentially the same. 



DiCRAEUs Loew. 



This genus was established in Berl. Ent. Zeitsch. in 1873 

 (XVII, 51) for the single species ohscurus; Becker (Mon. Chlor. 

 I, 111, 1910) regards this as synonymous with raptus, Haliday 



