424 Professor Williston on the 



6. Oiicinis concinnaj n. sp. 



$ . The very large, shining black vertical triangle reaches 

 nearly to the root of the antenna, leaviDg the sides below opaque- 

 brown. Antennae reddish-yellow, the front margin of the third 

 joint black ; arista pubescent. Eyes distinctly pubescent. Face 

 black iu the middle. Cheeks yellow, somewhat silvery. • Thorax 

 and scutellum deep shining black, with black hair ; bristles of 

 the scutellum approximated. Abdomen shining black. Legs 

 yellow, the femora for the most part pitchy black ; front tibiae 

 in part brown. Wings nearly hyaline ; second section of the costa 

 scarcely longer than the third. Length 1| mm. 



Three specimens. St. Vincent. This species closely 

 resembles 0. anonyma, but differs in the yellow- 

 antenna, the black femora, the approximated bristles 

 at the tip of the scutellum, the shorter, more slender 

 and yellow front tarsi, and the rather longer second 

 section of the costal vein. 



7. Oscinis mitisj n. sp. 



^, $. Yellow, the head with a minute black spot at the 

 ocelli, and the abdomen for the larger part brown. The very 

 large, shining vertical triangle reaches to the antennae and nearly 

 from eye to eye at the vertex. Scutellum rather large, subquad- 

 rate, the bristles of its apex not approximated. Mesonotum shining, 

 with yellow hairs. Legs lighter yellow. Wings greyish-hyaline ; 

 second section of the costa only a little longer than the third ; 

 third and fourth veins parallel. Length 2 mm. 



Four specimens. St. Yincent, " Windward side.'^ 



8. Oscinis incipiensj n. sp. 



$ , 2 • Front opaque light-yellow, the opaque, whitish-dusted 

 vertical triangle scarcely reaching the middle of the front. An- 

 tennae, face, cheeks and palpi light-yellow, the third joint of the 

 antennae somewhat brownish above. Thorax and the oval scutellum 

 deep black, but little shining, covered with greyish-yellowish dust 

 or pubescence, the scutellum somewhat yellowish at the apex. 

 Abdomen brownish-black, opaque. Legs yellow, the hind femora, 

 and the hind tibiae in the middle somewhat brownish. Wings 



