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.
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