so THE CANADIAN ENTOMOLOGIST 



in the melampyga group, the third joint distinctly angulated above 

 at apex; arista microscopically haired; cheek anteriorly as high as 

 width of third antennal joint. Mesonotum with 4 pairs of dorso- 

 centrals, the disc bare except for a few setulose hairs arranged in 

 2 irregular rows between the dorso-central series and another in 

 line with the latter. Femora rather stout. Wing venation similar 

 to that of melampyga, differing in having the third and fourth 

 "veins subjjarallel from middle of their last sections to apices; inner 

 cross-vein one-third from apex of discal cell; last section of fifth 

 ■vein nearly 3 tin:es as long as preceding section. 

 Length 1 mm. 



Type locality, Waukegan, III., August 25,- 1917, (J. R. Mal- 

 loch). Taken on shore of Lake Michigan. Food-plant unknown. 



This species resembles piisilla Meigen, but differs from it in 

 having fewer fine hairs on disc of mesonotum and in having the 

 prescutellar yellow m.ark. From all species known to me it dif- 

 fers in having the third antennal joint angular at apex above. 



Agromyza assimilis, sp. n. 



Male. — In colour this differs from the -preceding species in 

 having the tibiae and tarsi yellow, indistinctly clouded with fuscous, 

 and the yellow prescutellar mark on mesonotum triangular, its 

 anterior extremity being pointed. 



Structurally the principal differences lie in the shape of the 

 third joint of the antennae, which is considerably smaller and disc- 

 like, in the position of the ocelli, which are in an equilateral triangle, 

 and in the venation, the third and fourth veins being gradually 

 -divergent throughout the entire length of their apical sections. 

 -The dorsum of the mesonotum has even fewer short hairs than 

 that of angiilicornis, but a single irregular series appearing between 

 the dorse-centrals. 



Length 1 mm. 



Type locality. Freeport, 111., July 4, 1917, (J. R. Malloch). 

 ^ Pood-plant unknown. 



This species strongly resembles pusilla Meigen, but differs in 

 having the disc of mesonotum with fewer short hairs between the 

 dorso-centrals, and a conspicuous, triangul^ir yellow mark on 

 posterior margin. ^ 



