SIMULIUM. 43 



Slosson). There are several specimens of both sexes in the collection 

 of the Illinois State Laboratory of Natural Histor}'^ from Algonquin, 

 111. (Nason). 



This species attacks horses and is a persistent biter in South 

 Carolina, according to the observations of Messrs. Jennings and 

 King. Their data for the adults of the species on which observa- 

 tions were made are as follows: 



Lot 382. Gramlin, S. C, August 39, 1912. Two dozen Simulinm adults col- 

 lected in ears of a horse. Owner lives some distance out in the country. lie 

 gave a history of being bitten by these flies. His team had come fi"om the 

 farm a couple of hours before. No larvse or pupae. 



Lot 383. Gramlin S. C, August 19, 1912. SimiiUum adults from ears of a 

 horse, collected as horse was passing along the road. No larvse or pupae. 

 Driver gave no history of being bitten by the flies. 



Lot 214. Flat Rock, N. C, June 5, 1912. Simulinm adults taken while attack- 

 ing a horse. Were entering ears and biting on face, neck, and shoulders also. 

 (No larval or pui)al material.) 



Lot 220. Flat Rock, N. C., June 4, 1912. Simulium adults taken while attack- 

 ing a horse. After removal of horse they continued to dance in small swarms 

 about the same spot. Situation shaded by tall trees. (No larval or pupal 

 material.) 



The dates of occurrence of this species range from May 6 on the 

 Louisiana specimens to September 21 on those from Beltsville, Md., 

 and from the continuity it is evident that there must be many broods 

 or an unintermittent reproduction during the entire summer. 



The figures given on page IG of Bulletin 159 of the Kentucky Agri- 

 cultural Experiment Station by Garman are evidently details of the 

 larva of this species, though the pupa figured on page 15 belongs 

 either to meridionale or venustum. 



Simulium venustum Say. 



Female. — Black; frons glossy black, with very little dusting, face 

 black, distinctly white dusted, antenna? with basal three joints yel- 

 lowish, palpi black. Scutum shining black, with slight whitish 

 pollinosity, especially anteriorly and on sides, prescutum yellowish 

 or brownish, pleura3 black, white dusted, scutellum opaque black. 

 Abdominal basal scale opaque black or brown, basal four segments 

 velvety black, apical four glossy black. Legs yellowish, black as 

 follows : Mid and hind coxa? ; femora more or less at apices ; tibia? or 

 apical halves; entire fore tarsi ; apices of basal, most of second, and all 

 last three joints of mid and hind tarsi. All tibi;v silvered on dorsal 

 surfaces. Wings clear, basal portion and thick veins brown. Hal- 

 teres whitish yellow. 



Frons verj' sparsely haired on sides only, about one-half as wide 

 above antenna? as at vertex; face nearly as broad as frons at vertex 

 and very slightly longer than broad measured from highest point 

 in center to mouth margin, the surface hairs black; antennal pilosity 



