TABLE FOR THE DETERMINATION OP THE GENERA. 13 



f The face of both sexes very broad, not narrowed superiorly. 



Gen. XXIII. THINOPHIUTS. 



29 j The face of both sexes rather narrow, somewhat narrowed superiorly. 



Gen. XXIV. PEODES. 



! Outer appendages of the hypopygium long, filiform. 

 Gen. XXV. NEMATOPROCTUS. 

 Outer appendages of the hypopygium not long, nor filiform. 31 



(Third joint of the male antennae conspicuously large. 

 Gen. XXVI. LEUCOSTOLA. 

 Third joint of the male antennae small. 32 



oo ( Pulvilli of the male fore tarsi conspicuously enlarged. 33 



I Pulvilli of the male fore tarsi not, or very slightly, enlarged. 34 



oo f Pulvilli of the male fore tarsi not prolonged. Gen. XXVII. ECTARSUS. 

 I Pulvilli of the male fore tarsi prolonged. Gen. XXVIII. DIAPHORUS. 

 04 ( Arista altogether or almost altogether apical. 35 



1 Arista dorsal. 36 



OK ( Wings of considerable size (larger species). Gen. XXIX. LYROXECRPS. 

 I Wings of small size (smaller species). Gen. XXX. CHRYSOTUS. 



(Feet of the male with isolated, strong, spine-like bristles. 

 Gen. XXXI. TEUCHOPHORUS. 

 Feet of the sexes without isolated, strong, spine-like bristles. 37 



- ( Face not narrowed above. Gen. XXXII. SYMPYCNUS. 



( Face considerably narrowed above. Gen. XXXIII. CAMPSICNEMUS. 



!A11 femora slender, abdominal segments with bristles before the hind 

 margin. Gen. XXXV. LIANCALUS. 



Fore femora incrassated towards the basis. 39 



OQ I Fore tibiae with long thorns. Gen. XXXVI. SCELLITS. 



I Fore tibiae with very short little thorns. Gen. XXXVII. HYDROPHOKUS. 

 4 ~ ( Arista apical, or at least subapical. 41 



v Arista distinctly dorsal. 42 



r Third and fourth longitudinal veins strongly convergent. 

 41 1 Gen. XXXIX. MEDETERUS. 



I Third and fourth longitudinal veins parallel. Gen. XL. CHRYSOTIMUS. 

 > ( Male abdomen with six distinct segments. Gen. XLI. XANTHOCHLORUS. 

 (. Male abdomen with five distinct segments. Geiit XLII. SAUCEOPDS. 



