492 PROCEEDINGS OF THE NATION AL ilUtiliUil. vol.44. 



KEY TO THE GENERA OF THE ERIOPTERINI. 



(Based laniely on Xeedham's Key, 1907.1 



1. Wings absent Chionea Dallinan. 



Wings present 2. 



2. Three branches of M reach the wing-margin 3. 



Two branches of M reach the wing-margin 4. 



3. Sc very long; Sc, and R, approximated at their tips Lecleria Osten Sacken. 



Sc shorter; Sc, and R, distant at their tips Cladura Osten Sacken. 



4. Rj shorter than R^+s 5. 



R, longer than Rj+j 8. 



5. Cross vein r-OT absent; Sc, very long, approximating R, at their tips; cross vein 



r present Mongoma Westwood. 



Cross vein r-m distinct; Sc, short; no cross vein r ' ; ; " ■^• 



6. Antennae of the male as long as the body, prominently haired. . Lachnocera Philippi. 

 Antennae of the male short, normal 7. 



7. Sc short ending opposite, or anterior to, the origin of Rs; anal angle of the wing 



not prominent Gonomyia Megerle. 



Sc long ending near to the fork of Rs; anal angle of the wing prominent. 



Sacandaga Alexander. 



8. Rs long, normal in position; cell first R, elongated !). 



Rs shortened, its first fork angulated; cell first R, equilateral or nearly so. 



Cryptolabis Osten Sacken. 



9. Second fork of the radial sector on the posterior side, i. e., Rs ends in cell R,. 



ilolopliilns Curtis. 

 Second fork of the radial sector on the anterior side, i. e., Rs ends in cell R3 10. 



10. A supernumerary cross vein in cell Rj; second anal vein strongly bisinuated. 



IMobia Le Peletier. 

 No supernumerary cross vein in cell R, ; second anal not bisinuated U . 



11. Cu, tending to turn toward the apex of the wing Erioptera Meigen. 



Cu, tending to turn away from the wing apex - . 12. 



12. Antennal segments (male) subreniform, nodose; fourth antennal segment like a 



recumbent S Sigmatomera Osten Sacken. 



Antennal segments of the male not so 13. 



13. Sides of cell first M, parallel; Scj near tip of Sc, Gnophomyia Osten Sacken. 



Sides of cell first Mj "divergent distad; Sc, retracted toward the wing basis 14. 



14. The deflected base of Cu, meets M far before the fork; Rs long and straight at its 



origin; second fork of Rs skewed forward; tenninal 3 segmeut-s of the antennae 



usually abruptly smaller Trim icra Osten Sacken. 



The deflected base of Cu, meets M usually at the fork; Rs shorter, straight; second 

 fork of Rs usually symmetrical; flagellar segments of the antennae uniform. 



Rhypliolophus Kolenati. 



I have omitted Polymoria Philippi from this kej- as it is very 

 probably a Limnophila (See Limnophilini). 



1 Subgenus Emptda (geuus EriopUra) would run down here, but has cross vein r present. 



