Proc eedins's' of 
the United States 
National Museum 
SMITHSONIAN INSTITUTION + WASHINGTON, D.C. 
Volume 113 1962 Number 3464 
LARVAE OF THE CADDIS FLY GENUS RHYACOPHILA 
IN EASTERN NORTH AMERICA 
(TRICHOPTERA: RHYACOPHILIDAE) 
By Ottver S. Fiint, Jr. 
Introduction 
The caddis fly genus Rhyacophila, one of the largest genera in the 
Trichoptera, has at least 250 species. Of the more than 90 species 
known from North America, 26 have been recorded from east of the 
Great Plains. Although nearly a third of the world fauna is found 
in North America, the larvae of only 7 species, 1 from the west and 
6 from the east, have been described. Larvae of 69 species that 
occur in other parts of the world have been described; Ulmer (1957, 
pp. 123-128) gave a complete bibliography to these descriptions. 
The larvae of 17 of the 26 eastern species have been correlated with 
their adults, 11 of these being described here for the first time, and 5 
additional larval forms recognizable in the material at my disposal 
are being described herewith also. Because of lack of material, the 
larvae of fenestra and ledra could not be separated. J am thus able 
to recognize 21 distinct larval forms. I believe I do not have larval 
material for the following four species known from the east: montana 
Carpenter, vuphipes Milne, parantra Ross, and teddyi Ross. 
465 
