41 
a southern form. Its known area of distribution extends from 
Alaska, Hudson Bay, and New Hampshire, to Mississippi and 
Louisiana, and from Massachusetts and Connecticut to Kansas 
and Missouri. It is a single-brooded species so far as known. 
Fig. 10 The Buffalo-gnat, Simulium pecnarum, larva, lateral 
view. X 10. (From H Garman ) 
S. pictipes Hagen (Figs, xi, 12 ).—Pictipes is represented in 
our collection only by a single specimen of the adult fly obtained 
by Dr. Nason at Algonquin, Ill. Outside this state it occurs from 
New York to Idaho, Kentucky, Texas, and California. In New 
York it is locally very abundant in swift and rocky streams; and 
Fig. 11. Simulium pictipes , front of head 
of female. X 35. (Not reliable as to struc¬ 
ture of palpi.) 
it has been studied with unusual care at Cornell University. There 
are several generations—probably three—in a single season, the 
egg stage lasting eight days, the larval stage, three weeks, and 
the pupal stage, four. These are given as the periods for warm 
summer weather. They are doubtless longer when the water is 
Fig. 12. Simulium pictipes, larva. X 10. (From H. Garman.) 
