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 
Wald Oeaross id Cc OS oe eclapale euccharcars tue a raise eeteSe Tribe LASIOPTERARIAE 
cc Costa rare thickly clothed with scales, the third vein well separated 
therefrom ; 
d Antennae cyclindric, never binodose in the male 
Ca@laws=toothedhes scien ae Tribe DASYNEURIARIAE 
ce Claws simple 
f Antenna! segments cylindric or subcylindric, not elongated, 
usually stalked in the male.. Tribe OLIGOTROPHIARIAE 
ff Antennal segments cylindric, elongated sessile................ 
Tribe ASPHONDYLIARIAE 
dd Antennae binodose in the male............ Tribe DIPLOSARIAE 
bb Third vein forked at the base, apparently arising in most species di- 
ReCtlymtrOmestinCOstas neers neem ee Tribe EPIDOSARIAE 
LESTREMIINAE 
The Lestremiinae are easily recognized by the metatarsus being 
distinctly longer than the following 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 | pl. 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 Micromyia corni Felt, C. 459) 
bb Antennae not greatly reduced; male with 16, female with 11 antennal 
SEQTMIEMES eke iace sees csssa eater i Sc Celi ete ee ete pare Lestremia 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 
