August, 1944 



Ross: Caddis Flies of Illinois 



47 



larva, 1 pupa. Eichorn : May 11, 1935, 

 C. O. Mohr, 1 larva. Elizabethtown, 

 Hog Thief Creek: May 10, 1935, C. O. 

 Mohr, many larvae. Golconda: May 11, 

 1935, C. O. Mohr, many larvae; April 30, 

 1940, Burks & Mohr, many larvae. Herod, 

 Gibbons Creek: March 10, 1935, C. O. 

 Mohr, 1 pupa; May 10, 1935, C. O. Mohr, 

 many larvae, 1 pupa; May 29, 1935, Ross 

 & Mohr, 6 pupae; May 26, 1936, Mohr & 

 Burks, 1 (J (reared); May 29, 1936, Ross 

 & Mohr, 5^,89; May 15, 1941, Mohr & 

 Burks, 1 larva. Karbers Ridge: May 11, 

 1935, C. O. Mohr, 1 pupa. Waltersburg: 

 April 30, 1940, Mohr & Burks, 1 larva. 



Dolophilus moestus (Banks) 



Paragapetus moestus Banks (1914, p. 202); 



Dolophilus breviatus Banks (1914, p. 254); 

 d', 9. 



Larva. — Length 10-11 mm. Similar in 

 size and general structure to shawnee, dif- 

 fering in lacking the stout coxal spine on 

 the front legs and in having the transverse 

 bars of the frons only faintly indicated. 



Adults. — Size 6-8 mm. Similar in gen- 

 eral appearance and structure to those of 

 shawnee. Male abdomen with long apical 

 processes on seventh and eighth sternites; 

 genitalia, fig. 167, with short, stocky clasp- 

 ers. 



Our only Illinois records are from a 

 group of small, spring-fed brooks in the 

 Elgin Botanical Gardens, where we have 

 taken larvae, mature pupae and adults. This 

 species shares with Chimarra feria the dis- 

 tinction of being one of the earliest Illinois 

 caddis flies to appear on the wing, adults 

 having been taken as early as March 7. 



The species is widespread throughout the 

 eastern portion of the continent. In addition 



to Illinois, it is known from Georgia, Indi- 

 ana, New York, North Carolina, Ohio, 

 Ontario, Tennessee, Virginia, West Vir- 

 ginia and Wisconsin. 



Illinois Records.— Elgin : May 9, 1939, 

 Ross & Burks, 2$ ; May 23, 1939, Burks 

 & Riegel, 1 $ ; June 13, 1939, Frison & 

 Ross, 3 9 ; Sept. 19, 1939, Ross & Mohr, 1 

 larva, 1 pupa, 2 $ , 1 9 ; preceding Elgin 

 records from Botanical Gardens; Trout 

 Spring, March 7, 1940, Burks & Mohr, 3 9 . 



Trentonius Betten & Mosely 



Trentonius Betten & Mosely (1940, p. 11). 

 Genotype, by original designation: Philopota- 

 mus distinctiis Walker. 



Apparently only the genotype occurs in 

 the northeastern states. For many years 

 this genus has been identified in North 

 American literature as Philopotamus. 



Trentonius distinctus (Walker) 



Philopotamus distinctus Walker (1852, p. 

 104); d^, 9. 



Philopotamus americanus Banks (1895, p. 

 316); ^. 



This species has not yet been captured 

 in Illinois, but is known from Turkey Run 

 State Park, Indiana, which is only 17 miles 

 from the Illinois state line. It is distributed 

 throughout the northeastern states, with 

 records available for Indiana, Maine, Mary- 

 land, Michigan, Minnesota, New Bruns- 

 wick, North Carolina, Nova Scotia, On- 

 tario, Pennsylvania, Tennessee and Virginia. 



This species is remarkable because of the 

 production of adults during the entire year, 

 including the winter months, and the wing- 

 less condition of most of the females, fig. 

 171. Extensive records in the Illinois Nat- 

 ural History Survey files indicate that fe- 



Fig. 171. — Trentonius distinctus. 



