418 Professor Williston on the 



3. Thorax shining black 5 



Thorax not wholly black ............ 4 



4. Thorax reddish-yellow ; front black ; second and third 



sections of the costal vein of nearly equal length 



equalis, n. sp. 

 Mesonotum brown or blackish ; front yellow, with a 

 moderate-sized brown triangle ; second section of 

 the costal veia much longer than the third 



dcrsalis^ Loew. 



5. Scutellum black ; third section of the costal vein much 



shorter than the second flavipes, Loew. 



Scutellum reddish ; second and third sections of the costa 



of nearly equal length sGutellaris, n. sp. 



1 . Hippelafes (n. subg., SipJwmyia) prohoscideuSf n. sp. 



^ . Front opaque yellow, the vertical triangle black, but 

 covered with light greyish dust, leaving a small, rounded, shining 

 spot near the ocelli. The triangle reaches to about the middle of 

 the front, and its sides are nearly equilateral ; a row of small 

 bristles on either side reaches to below the middle of the front. 

 Antennse, face, cheeks and palpi wholly yellow ; on either side of 

 the oral margin in front a small vibrissal bristle. Proboscis slender, 

 elongate, bent near its middle and turned back, its slender proximal 

 portion a little shorter than the length of the head. Cheeks rather 

 broad. Palpi cylindrical, a little broader toward the end. Thorax 

 black, thickly greyish dusted, the mesonotum with three, slender, 

 indistinct lines; the pleurae shining black on the lower portion. 

 Scutellum oval, with two bristles on its border. Abdomen red or 

 brownish-red ; in some specimens reddish-brown with yellowish 

 incisures. Legs wholly light-yellow ; spur of the hind tibiae long 

 and stout. Wings cinereous hyaline ; third section of the costa 

 short. Length 2 mm. 



Ten specimens. St. Yincent. This and tlie following 

 species, while agreeing sufficiently well in the other 

 characters with the genus Hippelates, I have thought 

 well to distinguish subgenerically from the other species 

 by the name Sipliomyia, on account of the elongate 

 proboscis. Others of the previously described species 

 evidently belong to the same subdivision. 



