SIMULIUM. 45 



wan, Canada, June, 1907 (F. Ivnab) ; St. Louis, Mo., May 6, 1904 

 (W. V. Warner); Congaree, S. C, March-April, 1912; Abbeville, 

 S. C, April, 1912 ; Greenwood, S. C, xVpril, 1912 ; Columbia, S. C, 

 April, 1912; Tacapaw Mills, S. C, August 28, 1912; Spartanburg, 

 S. C, July 15, 1912 (reared); and Greenville, S. C, May, 1912 

 ("taken ovipositing in stream") (Jennings and King). Specimens 

 in the Illinois State Laboratory of Natural History collection are 

 from Algonquin and Havana, 111. 



The figures given by Garman ^ are evidently those of the larva of 

 jenningsl and not venustum. The larva and pupa described by Jo- 

 hannsen in his paper as venustuin var. «• are those of jemiingsi. 



Simulium piscicidium Riley. 



Female. — Black, subopaque. Frons and face with distinct white 

 pollinosity; antennae brown, basal two joints yellowish; palpi brown. 

 Scutum with white pollinosity on anterior lateral angles posterior 

 to prescutum ; prescutum sometimes brownish or yellowish ; pleurte 

 whitish poUinose ; scutellum brown or yellowish ; postscutum whitish 

 pollinose. Abdomen with basal four segments opaque, the apical 

 four shining, but not glossy; lateral posterior margins of first four 

 segments white pollinose. Legs j^ellow, blackened as follows: Mid 

 and hind coxa? ; apices of femora slightly ; apices of tibiae of all legs 

 distinctly; fore tarsi entirely; entire mid tarsi except base of first 

 joint; hind tarsi except basal two-thirds of first and base of second 

 joint. Wings clear, thick veins yellow, venation normal. Halteres 

 yellow, base of pedicel darkened. 



Frons divergent-sided, one-third as wide at upper angle of eyes 

 as head width, two-thirds as wide at lower angle as at upper, sur- 

 face hairs sparse, white; face as long as frons, about one-third longer 

 than broad, haired as frons; hairs on palpi pale; postocular cilia 

 mostly pale, with a few longer, black hairs intermixed. Scutum with 

 short, hairlike, white, regular pilosity, the hairs on posterior fourth 

 not conspicuous; pleural tuft whitish; postspiracular area sparsely 

 pale haired; scutellum with long, upright, brownish hairs and close- 

 lying pale pilosity. Abdominal basal fringe yellow; surface hairs 

 on segment short, pale, those at apex longer and dark. Legs with 

 pale pilosity and longer, upright, dorsal, brownish hairs; fore tarsi 

 dilated, the apical paired hairs present on joints 1 and 3; claws as in 

 venustuin. Hairs and short bristles on vein surfaces of wings 

 brownish. 



Length, 3-4 mm. 



Male. — Deep black. Face silvery pollinose ; antenna^ entirely black ; 

 palpi black. Scutum, viewed from In front, with two black, sub- 

 triangular marks on the anterior margin, the space between them 

 with a dull brown stripe which shows conspicuously against the white 



1 Bui. 159, Ky. Agr. Exp. Sta., 1912, p. 16. 



