SIMULIUM. 29 



on joints 1 and 3; hind tarsus of the normal shape for this genus; 

 tarsal claws simple (PI. II, fig. 12). Wings with dark brown hairs 

 on veins. 



Length, 4 mm. 



Type.— Cat. No. 15407, U. S. National Museum. 



Locality' : Sierra Madre, Mexico, head of River Piedras Verdes, 

 altitude about 7,300 feet. In ear of horse (C. 11. T. Townsend), 

 one female. 



I do not think that this can possibly be the species described as 

 cinisreum by Bellardi from Mexico, which is stated to attack horses. 



A translation of Bellardi's description is as follows: 



Male and female: Gray, antennae black, first joint pale. Thorax fuscous 

 and gray pollinose, the humeri pale; pleura light gray, scutellum pale at the 

 tip; halteros white. Abdomen blackish. The front coxse pale, the middle and 

 hind pairs grayish brown; the femora pale at base, their tips black; tibire 

 black, their middle section pale; front tarsi wholly black, the middle and hind 

 pairs with the bases of first and second joints pale. Wings hyaline. Length 

 of body 3 mm. ; extent of wings 9 mm. 



It is possible that this may prove to be identical with Mppovorwn^ 

 but Bellardi's description might apply to more than one species in 

 the genus equally well. I consider it better to have this species 

 clearly described and give it a name by which it may be distin- 

 guished than to accept it as Bellardi's species, which may very prob- 

 ably prove to be something entirely different. 



The early stages are unknown. 



The name cinereum was preoccupied when Bellardi used it, and 

 the change of name introduced by Speiser is given in the catalogue 

 at the end of this paper. 



GROUP B. 



In the species of Group B the thorax, abdomen, and legs are mostly 

 yellow. The ground color of all the Species is j^ellow, with the 

 thorax brown, or white, vittate, and the abdomen and legs more or 

 less darkened. 



TABLE OF SPECIES. 



1. Scutum with three dark vitta* 2 



Scutum with white vitt;e or with only two anterior marginal spots 3 



Scutum with three chocolate-colored stripes; abdomen much obscured 



with brown trivittatum, p. 30. 



Scutum with three deep black stripes; abdomen with three rows of 



black distinct It III, p. 30. 



3. Scutum with only anterior spots notatuiii, p. 32. 



Scutum vittate 4 



4. Larger species (from Mexico), claws with subbasal tooth^.oclirarcum, p. 30. 

 Smaller species (from New Mexico and Colorado) ; claws simple. 



hiviftatuin, p. 31. 



Neither the males, except of nofafnm and d'lstinctuni^ nor the early 

 stages of any of these species are known. 



