THE CANADIAN ENTOMOLOGIST 319 



Part of the VV. M. Wheeler collection in the American Museum 

 of Natural History. 



This fly belongs to the cognatella group and is closest to G. 

 delicata Alexander (Guatemala) but the venation is quite difi"erent 

 in the longer subcosta, the difterent shape of the sector and other 

 venational details. 



Gonomyia (Gonomyia) noveboracensis, sp. n. 



Male — Length 4 mm.; wing 4.9 mm. 



Rostrum light yellowish brown, the palpi dark brown. An- 

 tennae black throughout, the basal segments enlarged, the flagellar 

 segments very short, tapermg suddenly to the tip of the appendage. 

 Head light gray. 



Pronotal scutellum white, dark brown medially. Mesonotal 

 prsescutum plain grayish brown, the area behind the pseudosutural 

 fove?e paler, more yellowish; scutum similar; scutellum brownish 

 yellow; postnotum brown with a sparse grayish bloom. Pleura 

 .white with two brown stripes, the dorsal one beginning on the 

 cervical sclerites and continuing back to the wing basis; the ventral 

 stripe occupying the mesosternum. Halteres pale. Legs with 

 the coxa> and trochanters brownish yellow; femora, tibiae and tarsi 

 uniform dark brown. Wings light gray, the stigma not indicated; 

 costal vein yellow, the remaining veins dark brown. Venation: 

 Sc short ending far before the origin of Rs, this distance sub-equal 

 to the cross-vein r-m; Rs rather short, rather sharply bent just 

 beyond the base, a little shorter than Ri+r, Ri oblique, a little 

 longer than the cross- vein r-m\ basal deflection of Cm at or just 

 beyond the fork of M. 



Abdominal tergites dark brown, broadly margined with 

 silvery; sternites similar, narrowly ringed caudally with silvery; 

 hypopygium reddish yellow. Hypopygium with the ninth tergite 

 having the caudal margin with a broad rounded concavity. Ninth 

 pleurite prominent, elongate, the dorsal inner edge with a prominent 

 tubercle that bears several hairs, the ventral inner edge with a 

 row of large setigerous tubercles; three small pleural appendages, 

 a small, inner, dorsal, cylindrical appendage directed cephalad, 

 slightly enlarged basally, at the apex bearing three or four promi- 

 nent hairs; a dorsal apical appendage directed proximad, flattened, 



