OF WASHINGTON, VOLUME XVII, 1915 199 



Can. Ent., vol. 25, 1893, p. 183; Chittenden and Titus, Bui. 54, U. S. 

 D. A. Bur. Ent. 1905, p. 40-43; Fletcher, 33d Ann. Kept. Ent. Soc. 

 Ontario 1902 (1903) p. 86; 34th 1. c. 1903 (1904), p. 70; Harrington, 

 33d Ann. Rept. Ent. Soc. Ontario 1902 (1903), p. 100; Webster. H. L., 

 Jn. Econ. Ent., vol. 1, 1908, p. 310. 



gylogaster abnormis Provancher, Addit. fauna Can. Hyrn. 1885, p. 10; 

 Dyar, Tr. Amer. Ent. Soc.', vol. 25, 1895, p. 311-312; Can. Ent., vol. 

 27, 1895, p. 340; Jn. N. Y. Ent, Soc., vol. 5, 1897, p. 199. 



TWO NEW SPECIES OF SIMULIUM FROM TROPICAL AMERICA. 



BY ALLAN H. JENNINGS, Bureau of Entomology. 



During 1913 a commission headed by Dr. Louis W. Sambon 

 was sent from England to the West Indies and adjoining regions 

 to investigate pellagra and its manner of transmission. Through 

 invitation the writer was able to accompany this expedition with 

 the special object of investigating the insects that might have 

 a bearing on the transmission of the disease. Special attention 

 was given to Simulium and among the material collected were 

 the two new species described below. I am much indebted to 

 Mr. Knab for assistance in this connection. Details of the biol- 

 ogy of these species will be published in another place. 



Simulium samboni new species. 



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

 pollinose. Antenna; rather stout, brownish yellow, darker distally, I lie 

 first two joints honey yellow and smooth, the others clothed with short 

 whitish pile. Palpi blackish. Mesonotum bright orange-ferruginous, 

 with four narrow, pollinose, grayish-silvery stripes, the miter ones at the 

 lateral margins, the inner pair sinuate, extending nearly to the scutellum 

 and dividing the disk into three nearly equal parts; vestiture of fine, evenly 

 distributed golden hair-scales not forming regular series. Scutellum 

 paler than mesonoturn, honey yellow; transverse hair-scales on the disk 

 golden, the marginal bristles black. Postnotum ferruginous. IMeiine 

 ocher-yellow, strongly infuscated on the mesosternum. Abdomen sub- 

 cylindrical, black and gray; segments '2 to "> black and with the margins 

 and two longitudinal stripes gray, thus delimit ing three series of large 

 black spots; sixth segment shining, mostly gray. Anterior co\;r yellow, 

 the others infuscated. Legs bright ocher-yel|o\\ , the hind pair with the 

 apices of the femora infuscated and the distal halves of the tibia- blackish, 

 their basal halves with whitish luster: front tarsi blackish, the first joint 

 tinged basally with luteous; mid tarsi with the first joint pale, its distal 

 fourth blackish, the second joint pale on basal half, the last three joints 

 wholly blackish; hind tarsi with the first joint pale, infuscated along its 

 lower margin and on apical third, the second joint pale on basal half, the 

 last three joints wholly blackish; appressed hair-scales partly pah- ami 

 partly black, in correspondence with the ground-color. Claws simple, 

 thickened at base. Wings hyaline, the venation normal; thick veins pale 

 yellow; anal field without iridescent spot. Hal teres pale yellow. Length: 

 Body about 1.5 mm., wing 2 mm. 



