200 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



Male. Holoptic. Antennae much more slender than in the female, 

 Mesonotum strongly convex, the silvery pollinose ornamentation reduced 

 to two short wedge-shaped spots at anterior margin and visible only in 

 certain lights. 



Empire, Canal Zone, Panama, reared from pupae taken from 

 a small tributary of the Comacho River, October 4, 1913 (A. H. 

 Jennings). 



Type: Cat. No. 19996, U. S. Nat. Mus. 



It gives me pleasure to dedicate this handsome species to Dr. 

 Louis W. Sambon. 



Simulium antillarum new species. 



Female. Occiput, frons and face black, densely light silvery gray pol~ 

 linose; frons moderately broad, but very slightly narrowed anteriorly, 

 nearly parallel-sided. Antennae rather short, the first two joints ferrugin- 

 ous and nude, the following ones blackish brown and clothed with short 

 whitish pile. Palpi black. Mesonotum bright orange-ferruginous, the 

 region of the humeri and the lateral margins ochreous yellow, a narrow, 

 wedge-shaped dark spot at the lateral suture in front of insertion of wings; 

 on the anterior half two narrow silvery white pollinose stripes, nearly 

 equidistant from each other and from the lateral margins; these stripes 

 are nearly straight, tapered anteriorly and do not reach the anterior 

 margin; vestiture of very fine, evenly distributed black hairs not forming 

 regular series. Scutellum more yellowish than mesonotum, with trans- 

 verse yellowish hairs on the disk and a series of marginal black bristles. 

 Postnotum ferruginous. Pleurae ochreous yellow, with some silvery 

 pollinose streaks and with the mesosternum strongly infuscated. Abdo- 

 men shining, blackish, tinged more or less with yellow-brown basally and 

 distally, the apical margins of the segments very narrowly pale. Anterior 

 coxae yellow, the others infuscated. All the femora yellow; tibiae more or 

 less infuscated, the middle pair lightest, the posterior pair nearly black; 

 tarsi blackish; femora with yellowish hair-scales, tibia? and tarsi mostly 

 with black hairs. Claws simple, thickened at base. Wings hyaline, the 

 venation normal, the costa infuscated and densely black spinulose, the 

 other thick veins yellowish, a minute dark spot on the crossvein; a large 

 but rather faint reddish iridescent area in the anal field. Halteres pale 

 yellowish. Length: Body about 1.5 mm., wing 2 mm. 



Male. Holoptic. Antennas, much more slender than in the female. 

 Mesonotum strongly convex, the two silvery pollinose marks shorter and 

 broader. Abdomen siender, the first four segments ocher-yellow, the 

 succeeding ones black. 



St. Croix, Danish West Indies, November, 1913; Hope River 

 near Kingston and Roaring River close to the falls, Jamaica, 

 September, 1913 (A. H. Jennings). 



Type: Cat. No. 19997, U. S. Nat, Mus. 



The material was mostly reared from pupae occurring in rapid 

 streams in the above named localities. In St. Croix, on Novem- 

 ber 24 and close by their breeding-place, two specimens were 

 captured while biting man. 



Actual date of publication December 31, 1915. 



