June 1894.J TOWNSEND. SaNTO DOMINGO TaCHINID/K. 79 



side. Small black spot just back of humeri. Rest of thorax black, except a goUlen 

 yellow prescutellar parallelogram. Rest of pleurne black except a golden 

 yellow spot next above middle coxx\ Scutellum black. Abdomen cylindrical, 

 yellow, last two segments particularly golden yellow pollinose ; fourth segment, 

 sometimes also the fifth, tinged with reddish ; first segment black in middle, second 

 black anteriorly and with a black median vitta which becomes more or less obsolete 

 on fourth segment where its ends. The anterior margin of third segment is more 

 narrowly black, this black front border in both second and third segments being 

 widened laterally on sides of abdomen. The incisure between third and fouith 

 segments very narrowly black. I-egs reddish-yellow, cox?e silvery pollinose, the 

 front and middle femora on anterior side in middle with a black spot, the hind 

 femora with a black band in middle which is broader on anterior side. Knds of 

 all the libiiu, especially hind jiair, more or less blackish ; tarsi wholly black, claws, 

 except at tips, and pulvilli yellow. Distal half or third of hind femora black ciliate 

 on outer edge. Wings bright yellow en anterior margin, blackish or smoky in 

 middle, and neaily hyaline on hind bortier. 



The female differs only in her shorter claws, more cylindrical 

 abdomen, and in the yellow of winjrs being less strongly contrasted 

 with the smoky, the latter being much fainter. 



Ocypterosipha, gen. no v. 



Rclongs in Ocypteiiua. Kyes bare, front and face about one-thiril witllh of 

 head, front and epistoma angularly prominent, the head in profile being (]uite 

 square with angular corners. Antennic fully as long as face, porrect, first two 

 joints short ; third long and widened distally, knife-bladeshaped, concave on npper 

 edge, strongly convex on lower. Arista long, bare, curving terminally over the 

 end of third joint. Proboscis long and slender, almost hair-like, when fully 

 exerted more than three times as long as height of head, very slightly thickened 

 at tip, labella not developed. No palpi present. Thorax about same width as 

 head. Abdomen slightly narrower, cyliiuirical, a little narrowed ai base and anus. 

 A few short macroch?eta; on segments two to live. Legs rather long and slender, 

 especially front tarsi, claws and pulvilli short. Wings about as long as abdomen, 

 moderately broad, rounded at tip, apicai cell closed in margin at tip of wing, quite 

 evenly pointed in outline distally. Hind cross-vein nearly straight. 



Ocypterosipha willistoni, sp. nov. 



Length, 7 mm. (exclusive of antenna). Two specimens. Face silvery white, 

 front black. Antenna*, arista, proboscis, occiput, whole of thorax, scutellum, and 

 legs black. Occiput with a silvery area on sides next eye margin. Abdomen 

 entirely orange-red, the anus more er less narrowly blackisb. A median pair of 

 short macrochana;, and a lateral single one, apparently on segments two to four, 

 and several marginal on fifth segment, also sparse, short, black, appressed hairs 

 on abdomen. Tegula; pure white, eacl; composed of two scales, the upper scale 

 smaller. Wings uniformly smoky blackish. 



1 take pleasure in dedicating this species to Dr. S. W. 

 Williston. 



