Diptera of St. Vincent (West Indies). 423 



Four specimens. St. Vincent. The abdomen varies 

 much in colour, from reddish-yellow to black, and the 

 antenna may be wholly yellow. There are numerous 

 rather short stubbly bristles on the lateral and posterior 

 margins of the mesonotum and on the margin of the 

 scutellum, which are highly characteristic of the 

 species. 



4. semis anonyma, n. sp. 



$ , 2 ■ Front opaque black on the side, -with a large shining 

 black triangle, reaching nearly to the root of the antennae. 

 Antenna wholly black, the arista very finely pubescent. Face 

 black ; cheeks yellow. Thorax deep shining black. Scutellum 

 convex, black, with two strong, rather remote bristles. Abdomen 

 black, moderately shining. Halteres yellow. Legs yellow, the 

 bind tibiae in part and all the tarsi brown ; the tip of the front 

 tibiie and their tarsi were blackish. Wings greyish hyaline ; 

 second section of the costa slightly longer than the third. 

 Length 1^ mm. 



Two specimens. St. A^incent. 



5. Oscinis nana, n. sp. 



^ , $ . Front opaque, black in ground-colour, but covered with 

 a thin brownish "dust ; the large vertical triangle is somewhat 

 elevated, its sides nearly equilateral, and separated by a distinct 

 groove from the rest of the front ; it reaches about midway of the 

 front. Face brown or blackish ; cheeks yellowish. Antenna 

 black, the third joint in large part yellow. Thorax black ; the 

 mesonotum with four bi'oad, greyish-yellowish, not conspicuous 

 stripes, leaving three narrow, more blackish intervals. Scutellum 

 black, the bristles of its apex not remote from each other. 

 Pleurae greyish dusted. Abdomen black, not shining. Legs 

 yellow, the femora for the greatest part, and the last two joints 

 of the tarsi black. Wings nearly hyaline ; second and third 

 sections of the costa of nearly equal length. Length 1-1:^ mm. 



Four specimens. St. Vincent. The bristles are 

 everywhere short and inconspicuous. 



