308 NEW YORK STATE MUSEUM 



b Third vein simple at base, not forked 

 c Costa thickly scaled, third vein close to the anterior margin of the 



wing Tribe LASIOPTERARIAE 



cc Costa rare thickly clothed with scales, the third vein well separated 

 therefrom 

 d Antennae cyclindric, never binodose in the male 



e Claws toothed Tribe DASYNEURIARIAE 



ce Claws simple 



f Antennal segments cylindric or subcylindric, not elongated, 

 usually stalked in the male. . Tribe OUGOTROPHIARIAE 



ff Antennal segments cylindric, elongated sessile 



Tribe ASPHONDYLIARIAE 



dd Antennae binodose in the male Tribe DIPLOSARIAE 



hb Third vein forked at the base, apparently arising in most species di- 

 rectly from subcosta Tribe EPIDOSARIAE 



I.ESTREMIINAE 



The Lestremiinae are easily recognized by the metatarsus being 

 distinctly longer than the follow^ing segments, and by the pres- 

 ence of five tarsal segments and at least four long veins. 



LESTREMIINARIAE 

 This tribe is easily distinguished from the following by the dis- 

 tinctly forked fourth vein [pi. 33, fig. 1-3]. 



Key to genera 



a Costa continuous and extending beyond the apex of the wing 



Catocha Hal. 

 aa Costa not attaining the apex of the wing, practically disappearing at 

 its union with the 3d vein 



b Antennae greatly reduced; 8 to 9 segments in the male, the 2d greatly 

 enlarged ; in the female 10 short segments, the 2d somewhat enlarged 



Microcerata n. g. 



(Type Micro myia corni Felt, C. 459) 



hb Antennae not greatly reduced; male with 16, female with li antennal 



segments Lcstremia Macq. 



CATOCHA 



Members of this genus are easily recognized by the costa being 

 continuous and extending beyond the apex of the wing, where it 

 is joined by the third vein ; the fourth vein is forked, the cell 

 usually being distinctly shorter than in Lestremia. The antennae 

 differ greatly from those of Lestremia, being in the male of C . 

 americana [fig. 29] distinctly binodose, while in the case of 

 C. slossonae the basal enlargement is distinctly prolonged and 



