^ 



42 Families and Gknera of 



8. Third antennal joint conical ; bristle terminal. Lei'topeza 



Third antennal joint ovate; bristle sub-dorsal. Ocyduomia 



/rtv\% 0. Third lonsjitudinal vein f urcate.— ~_^ . ___►—- JRhamphomyia 

 1 „ . , „ ~^r~^i — -" — '•Mdytth.ir.i 



Third vein simple, not furcate, "t T^ . ^ — - r- 10 



10. No discal cell Cyrtoma 



A discal cell present 11 



11. Proboscis distinctly longer than the head. ... 12 

 Proboscis not longer than the head. ..... 14 



12. All the legs of nearly equal length; hind femora niucli thick- 



ened. ........ Paihymeiua 



Hind legs longer than the others; hind femora but little or not 

 at all thickened. 13 



13. Proboscis slender, directed backward or downward. ' Emi'is 

 Proboscis moderately thickened, directed forward. Iteaphila 



14. Antenna? very short, apparently two-jointed, tliird joint com- 



pressed, with a short, thick, unjointed style. IIormopeza 



Antennaj not very short, distinctly three-jointed ; third joint awl 



or pear-shaped or spherical, with a two-jointed terminal style 



or bristle. lo 



15. Proboscis as long as the head, conical, vertical ; anterior meta- 



tarsi usually thickened in the male. . Hilara 



Proboscis shorter than the head, horizontal ; anterior metatarsi 



of the male not thickened. ..... (iLo.ma 



1(3. Thirct longitudinal vein furcate; discal cell present; anterior 



coxaj usually elongate. 17 



Third longitudinal vein simple, discal cell wanting. 19 



17. Front femora much thickened; two posterior veins arise from 



the discal cell Hemerodromia 



Front femora not much thickened ; three posterior veins arise 

 froyi the discal cell. ....... 18 



18. Antenntv with a long terminal bristle. . . . Akdopteua 

 Antenna; with a short terminal bristle; sixth vein obsolete be- 

 fore reaching the margin. .... Clinocera 



Antennse with an extremely short terminal style ; sixth longitu- 

 dinal vein not evanescent before reaching the margin. 



Syna.mphotera 



19. Anal cell, or at least the posterior basal cross-vein, present j 



antenn* with a long terminal bristle. TA(' ^v^HK»SirA 



Anal cell wholly wanting. ....... 20 



