MYCETOPHILIDJE. 13 



LESTREMIN^E. 



1. Fourth longitudinal vein furcate 3 



Fourth longitudinal vein not furcate 2 



2. Antennae composed of from 11 to 25 joints, petiolate in the $. 



CAMPYLOMYZA Meigen. 



Antennae composed of 11 ($) or 8 (9) joints, petiolate in neither sex. 



MICROMYIA Rondani. 



3. Ocelli absent or indistinct. . . . ....?. . . 4 



Ocelli distinct. ....,/ 5 



4. Antennae 11-jointed in both sexes. . . . . CECIDOGONA Loew. 

 Antennae 16-jointed in the $ , 11 or 12-jointed in the 9- 



LESTREMIA Macquart. 



5. The anterior branch of the fourth longitudinal vein /-shaped, the pos- 



terior branch in a straight line with the prefurca. TRITOZYGA Loew. 

 The anterior branch only lightly curved ; antennae of 9 10-jointed. 



CATOCHA Haliday. 



2. MYCETOPHILID^E. 



Mostly small, delicate, slender flies, with more or less elon- 

 gated coxae. Head small, rounded or somewhat elongate. 

 Eyes round, somewhat prominent ; ocelli two or three in num- 

 ber, when only two, placed one on each orbital margin ; when 

 three in number, placed transversely in the form of a shallow 

 triangle. Front broad in both sexes. Antennas elongated, 

 curved, twelve to sixteen jointed, the two basal joints differ- 

 entiated, the remainder cylindrical, flattened or petiolated. 

 Proboscis rarely elongated; palpi three or four jointed, usu- 

 ally inflected, the first joint small. Thorax more or less, 

 sometimes highly arched, without transverse suture ; metano- 

 tum large ; soutellum small. Abdomen elongated, composed 

 of six or seven segments, cylindrical or compressed, sometimes 

 narrowed at the base ; male genitalia projecting forceps-like ; 

 ovipositor pointed, usually with two terminal lamellae. Legs 

 more or less elongated, the coxae more or less, sometimes much 

 elongated; femora more or less dilated, tibiae with spurs. 

 Wings large (wanting in the $ of Epidapus}', auxiliary vein 

 present, though sometimes rudimentary ; second longitudinal 



