2 PROCEEDINGS OP THE NATIONAL. MUSEUM vol. 69 



loch recognized 3 genera and 31 species for the same region, 5 of 

 which are here considered as synonyms. 



The chief differences between Malloch's and the present treatment 

 are in the arrangement of the gi-oups and species and the gi-eatly 

 extended distribution of species which the great abundance of ma- 

 terial now at hand affords. 



For specific differentiation, characters of the female hypopygium 

 have been employed, as well as those of the male, which has enabled 

 more accurate differentiation of some of the similar species. 



Attention should be called to A. W. Jobbins-Pomeroy's publica- 

 tion.- Detailed accounts of the biology and figures of the larva, 

 pupa, and male genitalia of SiTiiulmm venustu7n, S. jenningsi 

 (=ive7iustuvij, S. hracteatuni (■=^E. aureum)^ and S. pictipes are 

 given. 



A. E. Cameron in a bulletin ^ gives a very extended account of the 

 morphology and biology of Shnuliuin simile Malloch {=a?'cticum 

 Malloch). 



In certain of the descriptions of reared species following, where 

 the characters depend upon miscroscopic preparations, we have in 

 some cases mounted more than one specimen of a series. In these 

 cases the mounted specimens are designated as " types," the rest 

 of the series which agree macroscopically, but have not been mounted, 

 as " paratypes." 



TABLE OF GENERA OF SIMULIIDAE 



Radius setose on its entire lengtli. 

 Radius joining costa at middle of coastal vein ; radial sector forked ; antenna 



10-jointed Parasimulium Malloch. 



Radius joining coastal vein far beyond its middle. 



Radial sector with long fork ; hind basitarsus not produced apically ; second 

 hind tarsus without dorsal incision and much longer than width of 



basitarsus ; front usually broad Prosimulium Roubaud. 



Radial sector simple ; hind basitarsus produced or not produced apically, 

 second hind tarsus with or without dorsal incision and less than twice 



the width of the basitarsus ; front narrowed Eusimulium Roubaud. 



Radius bare between the stem vein and base of radial sector; radial sector 

 simple ; hind basitarsus produced apically ; the second hind tarsus with 

 dorsal incision and less than twice the width of basitarsus. 



Simulium Latreille. 



Genus PARASIMULIUM Malloch 



Parasimulium Malloch, U. S. Dept. Agr., Bur. Ent. Tech. Ser., No. 26, 

 1914, p. 24. 



Very small brownish species; antennae 10-jointed, large, being 

 longer than fore basitarsus and twice as long as the dorso-lateral 

 thoracic sclerite. Front broad, widened above ; clypeus very narrow, 



' U. S. Dopt. A^., Bull. No. 329, March, 1916. 



» Dom. Canada, Dept. Agric, Bull. No. 5, New Series, 1922. 



