BY FREDERICK A. A. SKUSE. 287 



or pedicelled ; eighth to twelfth flagellar joints generally more or 

 less elongate, oval, elliptical or cylindrical, beset with short hairs, 

 and at base verticillate-pilose ; in ^ second joint of scapus and 

 following seven flagellar joints usually bearing a thick brush or 

 plume of hairs. Thorax arched, almost oval, flattened in front of 

 scutellum ; scutellum small, semicircular ; metathorax very short. 

 Halteres short, naked. Abdomen with eight segments, cylindrical 

 or flattened, sometimes narrowing at base ; in ^ terminating in a 

 short forceps. Legs of about equal length, approximate at the 

 base ; femora sometimes incrassated, sometimes spinulose beneath ; 

 tibiae sometimes incrassated; tarsal joints varying in length; ungues 

 variable. Wings usually lanceolate or oval, haired or naked in 

 both sexes, sometimes naked or partly haired in ^ and entirely or 

 partly haired in 9 ; incumbent in repose. Seven longitudinal 

 veins. Third longitudinal when present usually extremely rudi- 

 mentary and indistinct ; third and fourth usually forked, fifth 

 always forked. Marginal and middle cross-veins normally pre- 

 sent. Auxiliary vein usually pale and indistinct. Costal 

 terminating before, at, or beyond the middle of the anterior 

 border, not reaching the apex of the wing. First longitudinal 

 vein joining before the end of costa, distinct. Second longitudinal 

 usually originating from first longitudinal beyond its middle (in 

 LeptoGonops from base of wing), distinct, usually united to first 

 longitudinal by marginal cross- vein. Third longitudinal vein 

 generally very indistinct, often entirely absent, usually appearing 

 as a faint detached fork (in Leptoconops simple, arising from base 

 of wing). Fourth longitudinal originating from fifth longitudinal 

 not far from base, pale, very pale at its origin, with rare excep- 

 tions joined to base (or a little beyond it) of second longitudinal 

 by middle cross- vein, anterior branch reaching margin above, at, 

 or below apex of wing, posterior branch originating somewhat 

 before, at, or a little beyond the middle cross-vein, sometimes 

 detached, rarely entirely wanting. Fifth longitudinal with a 

 short or moderate fork, pale, its posterior branch reaching margin 

 before, opposite, or beyond end of second longitudinal. 



