BUFFALO SOCIETY OF NATURAL SCIENCES 187 



29 Diaphorus sodalis Loew. 



DiopJwnts sodalis Loew, Neue Beitr., viii, p. 57 ; Mon. N. 

 Am. Diptera, ii, p. 163. 



Male : Length -t mm. Eyes widely separated by the front ; 

 antennae small, black, arista apical. Thorax and abdomen dark 

 metallic green; thorax distinctly pollenose ; bristles at the tip of 

 the abdomen conspicuous. Coxae and femora black ; tips of the 

 fore and middle femora and all tibiae yellow ; pulvilli of fore tarsi 

 moderately enlarged. Halters and tegulae pale yellow, the latter 

 with black cilia. Wings tinged with gray. 



I have seen four specimens of this species ; one sent by Prof. 

 J. M. Aldrich, taken in Polk County, Wis., which was presented 

 to him by Prof. C. Fuller Baker ; one from Mr. Harbeck which he 

 took at Roxboro, Pa. ; one in the Cornell University collection 

 from Black Rock Mountains, Ga. ; and one that I took at Spring- 

 ville, Erie County, N. Y., June 7, 191-i ; this last specimen has the 

 cilia of the tegulae more brownish when viewed from behind. 



30 Diaphorus trivittatus n. sp. 



Male : Length 2.5 mm. Face about as broad as long, thickly 

 covered with gray pollen ; front about as broad as the face and as 

 thickly covered with gray pollen ; antennae small, black, inserted 

 at or below the middle of the eyes, third joint very small ; arista 

 dorsal ; palpi rather large, yellow, brownish at base. Dorsum of 

 the thorax green, the gray pollen in some specimens quite thick, 

 in others scracely apparent ; dorsum with three coppery vittae, 

 one well defined central vitta, and a wider, poorly defined vitta 

 on either side, these vittae do not reach the scutellum ; pleurae 

 black with dark brown pollen which is not very noticeable ; 

 bristles of the thorax large. Abdomen greenish black, rather 

 short and thick for this genus ; bristles at the tip of moderate 

 size ; hypopygium small, its appendages scarcely visable. Coxae 

 and femora black, trochanters, extreme tips of femora, tibiae and 

 tarsi brownish yellow to brown ; tarsi rather darker brown than 

 the tibiae ; in one male the hind tibae are almost black ; fore and 

 middle coxae with long black bristle-like hairs on the front sur- 

 face ; fore tibiae with a small bristle near the base on the front 

 side ; middle tibiae with two large bristles on the front surface, 

 one near the base and one at the middle ; fore femora with a few 



