MYCETOPIIILID^E. 13 



LESTREMIiSr^. 



1. Fourtli longitudinal vein furcate. ....... 3 



Fourth longitudinal vein not fureatc. ...... 2 



2. Antenn;v; composed of from 11 to 25 joints, petiolate in the $. 



Campylomyza Meigcn. 

 Antenna? composed of 11 (5) or 8 ( 9) joints, petiolate in neither sex. 



MiCHOMYiA Rondani. 



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



Ocelli distinct. ' . . . 5 



4. Antenna; 11-jointed in both sexes. . . . Cecidogona Loew. 

 Antenna; 16-jointed in the J, 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 ; antenna^ of 9 10-jointed. 



Catocha Haliday. 



2. MYCETOPHILID.E. 



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

 gated coxge. Head small, ronnded 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. Antennae 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 ; seutellum 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 Avith two terminal lauielhB. Legs 

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

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

 Wings large (wanting in the / of E^rldapus); auxiliary vein 

 present, though somotinios rytlimentavy ; second longitudinal 



