310 The Philippine Journal of Science i9i8 



c\ Third vein before the apex (p. 316). 

 c". Third vein at the apex (p. 317). 

 c^ Third vein beyond the apex (p. 317). 

 cf. Circumfila irregular (p. 317). 

 dr. Circumfila regular (p. 317). 

 b\ Palpi triarticulate (p. 320). 

 h\ Palpi biarticulate (p. 322). 

 h\ Palpi uniarticulate (p. 323). 



ITONIDIDlNARl^e 



Key to the genera. 



BIFILI 



a\ Flagellate antennal segments of the male all binodose. 

 b\ Palpi quadriarticulate. 

 c'. Claws on all legs toothed. 



<r. Wings with greatly produced and broadly rounded areas 



posteriorly. 



e\ Internal basal lobe of the basal clasp segment setose, the dorsal 



and ventral plates deeply emarginate, the lobes of the 



ventral plate very long, moderately narrow, the ovipositor 



very short, turned dorsad and not protractile. 



Indodiplosis Felt. 



e". Internal basal lobe of the basal clasp segment smooth, the 



dorsal and ventral plates broadly and slightly emarginate, 



the ovipositor with a length one-half that of the abdomen, 



protractile Erosomyia Felt. 



c". Claws of anterior legs toothed. 



d\ Wings normal, the posterior areas not greatly produced, the 

 fifth antennal segment having the basal stem with a length 



about two and one-half times its diameter Toxomyia Felt. 



c^ Claws all simple. 



d'. Costa thickened basad to form a spindle-shaped enlargement. 

 e\ All of the flagellate antennal segments of the male binodose 

 and with circumfila ; ovipositor aciculate. 



Lowodiplosis Kieff. 

 d\ Costa not thickened basad. 



e\ Wings of the male with the posterior area greatly produced 

 and broadly rounded. 

 /'. Stems of the flagellate antennal segments of the male short, 

 with a length about one-half the diameter, the harpes not 



strongly chitinized Lobopteromyia Felt. 



/"■. Stems of the flagellate antennal segments of the male with 

 a length over twice their diameter, the harpes strongly 



chitinized and convolute Streptodlplosis Felt. 



e^ Wings narrow, with a length at least three times the width, 



the ovipositor greatly produced, chitinized Thurauia Riibs. 



e". Wings normal, neither specially broadened nor narrowed. 

 p. Costa thickly clothed with scales, the third vein uniting with 

 the margin before the apex of the wing. 

 g\ The first antennal segment with a dorsal tooth, the wing 

 membrane with narrow scales Endaphis Kieff. 



