6 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



Paratypes.—M.2i\Q and female, U.S.N.M. No. 43658. 



i?6marZjs.— Described from 11 males and 9 females, all collected 

 at Taughannock Falls, near Ithaca, N. Y., on August 19, 1928, by 

 J. E. Collin, of Newmarket, England ; and 1 female collected by me 

 at Washington, D. C, on July 1, 1920. In the specific name I mean 

 to celebrate the ability of Mr. Collin as a coUector.^^ 



Four males and three females of the Ithaca material are retained 

 in the National Museum, a gift from Mr. Collin; the rest of the 

 series, including the type, is returned to him. 



A single female in the National Museum, collected by me at La 



Fayette, Ind., August 24, 1916, seems to belong to another species of 



this genus. 



Genus LEPTOCERA Olivier 



Leptocera Oliviee, Mem. Soc. Agr. Dept. Seine, vol. 16, p. 16, 1813. — CoQuiLLmT. 

 Proc. U. S. Nat. Mus., vol. 37, p. 559, 1910. 



LEPTOCERA (LIMOSINA) OPACA, new species 



Head, thorax, and abdomen black. Front opaque, two-thirds the 

 width of head, with two pairs of convergent bristles back of vertex 

 (one outside the other) ; a small divergent pair just behind ocelli; 

 outer verticals reclinate, inner large and convergent but not decus- 

 sate; ocellars proclinate and divergent; two divergent orbitals each 

 side; three pairs convergent bordering middle region, lowest just 

 above suture. Antennae black, decidedly divergent, separated by the 

 triangular lunule ; arista long and slender, pubescent. Face shining 

 black, concave, epistoma protruding, narrow, prelabrum visible but 

 not prominent ; a large bristle laterally below end of sirture at edge 

 of mouth, directed forward. Cheek at narrowest hardly one-half 

 the eye height, bare except a few hairs below. Mouth large. Meso- 

 notum opaque, nearly circular, with 14 regular rows of hairs ; suture 

 not distinguishable. Thoracic bristles as follows: Dorsocentral, 1; 

 prescutellar, 1 small; humeral, 1; notopleural, 1; presutural, 1; 

 postalar, 1; mesopleural, 0; sternopleural, 1; scutellum flat, moder- 

 ately long, bare, with two pairs of marginals. Halteres brownish 

 yellow. Abdomen opaque black. Legs black. Coxae and trochan- 

 ters yellow, the former more brownish; tarsi brownish, middle and 

 hind often yellowish. Mid tibia of female with one smallish ventral 

 bristle on middle and large apical on same side (both lacking in 

 male), also two widely spaced bristles in both sexes on anterior dor- 

 sal surface and two beyond middle and nearly side by side on pos- 

 terodorsal. Wings with slight infuscation, moderately rounded; 

 costa without striking bristles, the segment between tips of first and 

 second veins equal to the following; cross veins strikingly approx- 



»• Dr. G. Enderlein, of Berlin, Germany, also distinguished himself as a collector by 

 capturing both sexes of the same fly on the same occasion, as I learned from a letter 

 received after the galley proofs of the present paper had been corrected. 



