Divtera of St. Vincent {West Indies). 293 



Tlie foregoing, without cliange, was written in the 

 belief that our specimens represented a new genus. A 

 more careful search of the literature, however, revealed 

 to my surprise the congenerousness of the species, 

 especially AT. alhitarsls, DoL, included in the genus 

 Mongoma. The species hitherto made known — seven or 

 eight in all — are from Java, Sumatra, the Philippine 

 Islands, Borneo, Madagascar, and Southern Africa. 

 ]ts occurrence in the western continent is of great 

 interest. 



1. Mongoma manca, n. sp. 



^ , $ . Front and basal joints of the antennae brownish red ; 

 flagellum of antennae and the palpi brown or black. Thorax, light 

 brownish-red, the metanotum sometimes a little darker, and the 

 pleurae more yellow. Halteres yellow. Abdomen brown or 

 brownish-red, the terminal segments more reddish. Legs brownish; 

 base of femora and the distal joints of the tarsi more yellowish. 

 Wings nearly hyaline ; stigma small, rounded, brownish. Length 

 7-8 mm. 



Six specimens. Forest, 2000 feet, July. 



2. Mongoma pallida, n. sp. (PI. X., fig. 67, wing.) 



;^ , ^ . Wholly light yellow, the front and outer joints, the 

 anteunse, only, brown or brownish; the legs a little darker. Wings 

 pure hyaline, with light-coloured veins ; no stigma ; the distance 

 between the junction of the marginal cross-vein and the origin of 

 the anterior branch of the second vein greater than in M. manca, 

 nearly as great as the length of the anterior branch itself. Length 

 5 mm. 



Four specimens. 1000-1500 feet. In addition to 

 the smaller size, mucli lighter colour, and more hyaline 

 wings, the species will be readily distinguished by the 

 shorter outer subm.arginal cell. In the present species, 

 its inner end, in all the specimens, is opposite the inner 

 end of the second posterior cell; in M. manca the 

 proximal end is, in every case, at a considerable distance 

 proximad to that of the posterior cell. 



