422 Professor Williston on the 



small, round, black spot above the middle coxae. Scutellum large, 

 nearly equilaterally triangular, with its apex rounded and pro- 

 vided -with two approximated bristles ; wholly light-yellow. 

 Metanotum and the abdomen, except the immediate base, shining 

 black ; venter yellow. Legs yellow ; front tibiae and tarsi brown 

 or brownish ; the distal two joints of the hind tarsi in the $ black. 

 Wings greyish hyaline ; third section of the costa about two- 

 thirds the length of the second section ; third and fourth veins 

 parallel. Length 2^^ mm. 



Five specimens. St. Vincent, Leeward side, 500- 

 1000 feet. 



2. Oscinis apicalis, n. sp. 



Eyes distinctly pubescent. Front opaque reddish-yellow, the 

 large vertical triangle deep shining black, its anterior point reach- 

 ing about two-thirds of the distance to the root of the antennae. 

 Antennae reddish-yellow, the upper margin of the third joint 

 brownish ; arista black, finely pubescent. Face, cheeks, and 

 clypeus black. Palpi reddish-yellow. Mesonotum deep black, 

 moderately shining, fiuely punctulate. Scutellum elongate, tri- 

 angular, pointed ; black, its apical one-third light-yellow ; there 

 are two upright, small bristles at the tip, and on either side a 

 minute tubercle. Pleurae shining black. . Abdomen shining black, 

 the venter yellowish. Halteres nearly white. Legs, not including 

 the coxae, wholly light-yellow. Wings greyish hyaline ; third 

 section of the costa not more than one-half the length of the second 

 section ; second, third, and fourth veins parallel. Length 2 mm. 



One specimen. St. Vincent. "Forest, 1800 fuet, 

 W. slope of Sonfriere, Sept. 23.^^ 



3. Oscinis quadrilineata, n. sp. 



^ , $ . Eyes pubescent. Front opaque yellow, with a small 

 brown spot between the ocelli ; vertical triangle small, but little 

 shining. Antennai yellow, the third joint brown on its front 

 margiu. Face, cheeks, and palpi yellow. Thorax yellow, the 

 mesonotum with four narrow brown stripes, not shining, the 

 median pair more narrowly separated. Scutellum light-yellow. 

 Metanotum and abdomen black, the latter at its immediate base 

 yellow ; venter yellow. Legs yellow. Wings nearly hyaline ; 

 third section of the costa scarcely one-half the length of the second 

 section. Length 2 mm. : , , 



