August, 1944 



Ross: Caddis Flies of Illinois 



51 



May 11, 1935, C. O. Mohr, 1 larva. Herod: 

 Grand Pierre Creek, July 29, 1898, Hart, 

 many larvae; Gibbons Creek, March 28, 

 1935, Ross & Mohr, $ $ , 9 9, many 

 pupae, pupal skins and larval parts; June 

 21, 1935, DeLong & Ross, i i ; July 11, 



1935, DeLong & Ross, S S, 2? ; May 1, 



1936, Ross & Mohr, $ $ ; May 12, 1936, 

 Mohr & Burks, 2 $ ; June 24, 1936, DeLong 

 & Ross, 5 $ ; Gibbons Creek, Sept. 11, 1937, 

 H. H. Ross, 3 larvae; Oct. 7, 1937, Ross & 

 Burks, 1 $ ; July 27, 1938, Burks k Boesel, 

 3c?, 1 mating pair; Oct. 1, 1941, B. D. 

 Burks, many larvae. Vienna: May 29, 

 1939, Burks & Riegel, $ $ , 9 5,1 mating 

 pair; May 1, 1940, Mohr & Burks, 2$, 

 \9. Waltersburg: March 24, 1939, Ross 

 & Burks, 8 larvae. West Vienna, Branch 

 Cache River: May 13, 1939, Burks & 

 Riegel, $ $ , 6 larvae. 



Chimarra angustipennis Banks 



Chimarrha angustipennis Banks (1903rt, p. 

 242); c^. 



This species, not yet taken in Illinois, 

 occurs in Oklahoma and Arkansas. It is a 

 close relative of the two preceding species. 

 The larva is unknown. 



Chimarra obscura (Walker) 



Beraea? obscura Walker (1852, p. 121); d'. 

 Jl'ormaldia plutonis Banks (1911, p. 358); cf . 

 Chimarrha lucia Betten (1934, p. 175); cT, 9. 



Frequenting rapid and clear streams, this 

 species has been taken at many points in 

 northern, eastern and extreme southern 

 Illinois. In each case our catches have been 

 small, except in a few localities in the Ozark 

 Hills of southern Illinois. Mature male 

 pupae have been collected from many locali- 

 ties. 



This species is the most widely distributed 

 in the genus, fig. 18, being known from Ar- 

 kansas, Illinois, Indiana, Kentucky, Maine, 

 Maryland, Michigan, Minnesota, Missouri, 

 New York, Ohio, Oklahoma, Ontario, 

 Pennsylvania, Texas, Virginia and Wiscon- 

 sin. 



Illinois Records. — Many males and fe- 

 males and three pupae, taken May 11 to 

 October 5, and many larvae, taken April 

 10 to August 27, are from Aurora, Dan- 

 ville (Middle Fork River), Golcondo, He- 

 rod (Grand Pierre Creek), Jonesboro 



(Clear Creek), Kankakee (Kankakee Riv- 

 er, Rock Creek), Momence, Oakwood (Salt 

 Fork River), Oregon, Spring Grove, West 

 Havana, West Vienna, Wilmington (Kan- 

 kakee River), Wolf Lake (Hutchins 

 Creek). 



Chimarra socia Hagen 



Chimarrha socia Hagen (1861, p. 297). 

 Wormaldia femoralis Banks (1911, p. 358). 



Our only records for Illinois are along 

 the Kankakee River. The species is appar- 

 ently restricted to the northern and eastern 

 states, and these collections for Illinois rep- 

 resent a local occurrence at the extreme 

 western edge of its range. Association of 

 larvae and adults is on the basis of a mature 

 male pupa collected at Spooner, Wisconsin. 



Known from Florida, Georgia, Indiana, 

 Kentucky, Maine, Maryland, Michigan, 

 New Brunswick, New York, Ohio, Ontario, 

 Pennsylvania, Quebec, South Carolina and 

 West Virginia in addition to Wisconsin. 



Illinois Records. — Kankakee, Kanka- 

 kee River: Aug. 1, 1933, Ross & Mohr, 

 6 larvae. Momence, Kankakee River: May 

 26, 1936, H. H. Ross, 2^. 



PSYGHOMYIIDAE 



The adults of this family range in size 

 from fairly large species which might read- 

 ily be confused with the Hydropsychidae 

 to very small ones which, in general sorting, 

 are frequently confused with Hydroptilidae. 

 The larva, fig. 188, is active and spins a long 

 silken net ; when taken out of the water 

 the net collapses and appears only as an ir- 

 regular mass from which the larva wriggles 

 free. Certain species are restricted to rapid 

 streams, whereas others have an extremely 

 wide ecological tolerance and are found in 

 situations varying from lakes to rapid rivers. 



The group formerly was divided into two 

 families, the Psychomyiidae, containing 

 Psycliomyia, Lype and Tinodes, and the 

 Polycentropidae, containing Pliyloceniropus, 



Fig. 188. — Polycentropus interruptus larva. 



