OF WASHINGTON, VOLUME XVI, 1914 95 



pollinose. Two pairs of orbital bristles present, frontals descending to 

 apex of second antennal joint (fig. 7). Face including cheeks gray polli- 

 nose, parafacials not more than one-sixth as wide as facial depression; 

 fascialia bristly on nearly the lower half. Vibrissse on. oral margin not 

 strongly cruciate. Proboscis brown, short and fleshy, palpi dark yellow. 

 Cheeks about one-sixth height of eye. Ocellar bristles absent, eyes in the 

 type nearly bare. Posterior orbits yellowish, occiput gray, rather thinly 

 clothed with whitish hairs. Thorax gray pollinose, four distinct black vit in- 

 visible extending nearly to scutellum where each outer pair is approxi- 

 mated but not joined. Scutellum triangular, gray pollinose, bearing three 

 marginal pairs, also a discal pair; apicals absent. Dorso-central bristle 

 three, sternopleurals three. Abdomen elongate ovate, black, intermedi- 

 ate segments broadly gray pollinose on basal two-thirds extending almost t <> 

 posterior margins at center and on the extreme sides of segment . A narrow 

 med'.an vitta apparent on intermediate segments. Fourth segment black 

 and grayish pollinose at base, yellow on apical third, anal plate yellow. 

 First and second segments destitute of true median marginal or disr.-i! 

 macrochaetae, third bearing a median marginal pair but without diseaU. 

 fourth with both discals and the usual row of stout marginals. 



The two intermediate segments each bearing on its ventral surf a > 

 median keel armed with backward curving short stout spines precisely as 

 in concinnaia; apical segment armed with a curved chitinized piercer. Legs 

 black, middle tibiae bearing a single stout macrochajta on the front side near 

 the middle, hind tibiae subciliate. 



Wings hyaline, first posterior cell narrowly open in margin, distinctly 

 before tip of wing; fourth vein shortly rounded at bend; costal spine obso- 

 lete. Calypters whitish nearly transparent, edges yellowish. 



Described from a single female reared from Cirphis latiuscula 

 H. S.,at Rio Piedras, Porto Rico, January 30, 1912, by Mr. T. H. 

 Jones. 



The species described above resembles Compsilura concinnata 

 rather strongly, the chief differences are as follows: Front and 

 posterior orbits yellow pollinose; eyes nearty bare; apical pair 

 of scutellar bristles absent; discal macrochsetse of intermediate 

 abdominal segments absent; cheeks not more than one-sixth eye 

 height; tip of fourth abdominal segment and anal plate yellow. 

 The genus Compsilura has hitherto not been reported from this 

 country, except of course as artificially introduced into the Nc\\ 

 England States, and some of the characters above enumerated 

 are by a few authors regarded as of generic value. But as the 

 proposed species is based upon a single reared female specimen, 

 the habitus and main structural characters of which agree exactly 

 with Compsilura, I think that it would better be referred hen-. ;tt 

 least until such time as the male becomes known. 



