228 A. L. MELANJJER. 



and abdomen shining. Third antenna] joint elliptical. Proboscis 

 and palpi yellowish. Beard of lower occiput short, dirty white. 

 Thorax slender, pectus silvery. Scutellum with two well-separated 

 short bristles. Abdomen less shining than the pleurse, shorter than 

 the thorax, flattened, hypopygium shining, tiiicker than abdomen at 

 base, much as in inusta, but with a dorsal fringe in addition to the 

 larger ventral one. Coxse yellowish, front tibise piceous, front 

 femora relatively thicker than in inusta. The underside of the legs 

 is devoid of true setulse, the front femora beneath pale ciliated. 

 Wings narrow, third vein straight, fourth slightly arching forwards, 

 the distance between the two greater than in inusta; veins fuscous, 

 not black ; second basal cell longer than the first by the length of 

 the cross-vein ; basal cells narrow, sixth vein wanting, anal cross- 

 vein present. 



Mr. Coquillett determines as this species specimens received from 

 Prof. Cockerell and taken at Mesilla, New Mexico. 



Tachy<Iroinia feiiestrala Say. 

 Say, Jour. Acad. Phila., iii, p. 95. 

 Wiedeniatin, Aussereuropseische Zweifluegelige Insecten, ii, 12, I. 



Black. AnteniiEE yellow; palpi white, proboscis yellowish, thorax shining 

 black, in certain directions somewhat grayish. Scutellum with two bristles. 

 Pleurse jet black. Abdomen piceous, darker at apex. Wings brownisli. Front 

 femora on inner side with a black line; front tibise and hind femora with a pice- 

 ous line ou each side. 4 mm. 



Middle States. 



Ta<;hy(lroiiiia Nimilii^ Walker. 

 List Dipt. Ins., iii, p. 506. 



''Body lilack, slightly shining; eyes and mouth piceous; feelers tawny, with 

 black tips; legs tawny ; tips of feet black ; fore thighs striped with black ; mid- 

 dle shanks piceous; hind thighs and tips of hind shanks black; wings brown; 

 wing-ribs and veins piceous; poisers tawny. Length of the body 1^ lines; of 

 wings 2 lines. 



"Hudson's Bay (Barnston)." 



Tacliydroinia inaculipeiinis Walker. 

 List, etc., iii, 507. 



" Body black, shining ; eyes piceous; feelers and mouth black; legs piceous; 

 wings nearly colourless, white at base, each with a large brown spot on fore border 

 at two-thirds the length from the base; wing-ribs and veins piceous, the latter 

 yellow towards the base. Length of body IJ lines; of wings li lines. 



"Hudson's Bay (Barnston)." 



