40 Paych$ [February 



NEW NEOTROPICAL ANTOCHINI {TIPVLIDM 

 DIPTERA). 



By Chas. P. Alexander, 1 

 Ithaca, N. Y. 



This paper considers only the members of the Limnobiine tribe 

 Antochini, a rather extensive group in the tropics. The genera 

 have an almost Cosmopolitan distribution, occurring in both the 

 Old and New Worlds, exceptions existing in Styringomyia, Para- 

 tropeza, Thaumastoptera, Diotrepha and Atarba. The material 

 studied herein, is, for the most part, the property of Cornell Uni- 

 versity and the U. S. National Museum and to Dr. J. Chester 

 Bradley and Mr. Frederick Knab, I am indebted for the privilege 

 of examining these collections. 



A KEY TO THE ANTOCHINE GENERA. 1 



1. Cell R.2 present (Central and South Amer.) Paratropeza Schiner. 



Cell R 2 absent 2 



2. Rostrum prolonged, at least as long as the head 3 



Rostrum shorter than the head 6 



3. Rostrum about as long as the head. (Eur. ;N. and C. Am.; Austral.) 



Rhamphidia Meigen. 



Rostrum about as long as the body 4 



( Toxorrhina group) 



4. Radial sector two-branched 5 



Radial sector unforked (N. and S. Am.; Africa) Toxorrhina Loew. 



5. Anterior branch of Rs (R2 + j) long, as long as the posterior branch 



(Rj+s) (Eur.; N. and C. Am.; East Ind.) Elephanfomyia Osten Sacken 



Anterior branch of Rs (R2+s) very short, oblique, tending to disappear. 



(Africa, America; tropics) Ceratocheilvs Wesche 



6. Cu 2 at least 4 times as long as the deflection of Cui; deflection of 



Cui tending to retreat toward the wing basis. .7 (Thaumastoptera group) 

 Cu 2 not much more than twice as long as the basal deflection of 

 Cui; Cui (deflection) remaining at, or near, the fork of M 9 



7. Mi+2 free at the wing- tip. (Mafused with Cm obliterating cell Ma.) 



(Europe; Seychelles Is) . . Thaumastoptera Mik 



Mi+ 2 fused to the wing-tip 8 



8. M 3 distinct from Cu at its tip forming a cell M 3 ; basal deflection of 



Cui under the base of Rs. (Eur.;N. and C. Am.; Austral.) 



Orimarga Osten Sacken 



1 Contribution from the Entomological Laboratory, Cornell University. 



