August, 1944 



Ross: Caddis Flies of Illinois 



65 



Allotype, female. — Wolf Lake, Illinois, 

 along Hutchins Creek: May 31, 1940, B. 

 D. Burks. 



In Illinois we have taken this species only 

 in the extreme southern portion and in the 

 extreme northwestern corner. In the for- 

 mer area we found the species very abun- 

 dant in Hutchins Creek where larvae, pupae 

 and adults were associated. All our records 

 are along small, fairly clear and rapid 

 streams. 



The range of the species includes the 

 Ozarks and adjacent ranges with a north- 

 eastward extension into New York. We 

 have records from the following states: 

 Arkansas, Illinois, Missouri, New York and 

 Oklahoma. 



Illinois Records. — Galena, Sinsinawa 

 River: June 5-6, 1940, Mohr & Burks, 1 $ . 

 Herod: May 29, 1936, Ross & Mohr, 1 9 . 

 La Rue, McCann Spring: May 26, 1939, 

 Burks & Riegel, 4 cJ , 9 9. Wolf Lake, 

 Hutchins Creek: Oct. 5, 1938, Prison & 

 Burks, 4 9 ; May 25, 1940, Mohr & Burks, 

 19 ; May 31, 1940, B. D. Burks, $ $, 

 9 9. 



Polycentropus pentus Ross 



Polycentropus pentus Ross (1941^, p. 71); 

 cT, 9. 



Larva. — Unknown. 



Adults. — Length 8-10 mm. General col- 

 or mottled brown, the wings with a few 

 light spots along periphery. Male genitalia, 

 fig. 242: cerci narrow, with a finger-like 

 projection near middle, apical filament rela- 

 tively short; ninth segment narrow; claspers 

 long, ventral aspect slightly irregular and 

 tapering slightly toward apex, baso-dorsal 

 appendage long, the apex pointed and the 

 mesal point sharp; aedeagus slightly curved 

 with a large hump on ventral margin near 

 base. Female genitalia, fig. 259: eighth 

 sternite wide, apex fairly evenly curved and 

 slightly produced at tip, lateral lobes long 

 and lanceolate; ninth sternite with a pair 

 of sclerotized bars wide apart at base and 

 converging markedly toward apex; bursa 

 copulatrix conical, its supports poorly de- 

 fined except for the apical rods, which are 

 narrow and sinuate. 



Our only record for this species in Illi- 

 nois is a single male collected at Split 

 Rock Brook, Utica, July 11, 1941, Ross & 

 Ries (see p. 7). 



The range of the species is not well de- 



fined, but it is apparently widely distrib- 

 uted through the Northeast, our Illinois 

 record being the most western point from 

 which it is known. Records are available 

 from Illinois, New Hampshire and Ontario. 



Polycentropus tnaculatus Banks 



Polycentropus maculatus Banks (1908rt, p. 

 65); d^. 



This species has not been taken in Illinois 

 but is distributed through the eastern states. 

 Records are available from Newfoundland, 

 New Hampshire, New York and Tennessee. 

 The male genitalia, fig. 243, are distinctive. 

 The female is similar to the male in color 

 and general structure and is readily distin- 

 guished by the widely separated, narrow 

 and frequently angulate lateral lobes of the 

 eighth sternite and the parallel, rugose, 

 sclerotized bands of the ninth sternite, fig. 

 258. 



Allotype, female. — Chimneys Camp 

 Grounds, Great Smoky Mountains National 

 Park, Tennessee: July 16, 1939, at light, 

 A. C. Cole. 



Polycentropus confusus Hagen 



Polycentropus confusus Hagen (1861, p. 293); 

 cf , 9. 



While not as yet found in Illinois, this 

 species is almost certain to be taken with 

 additional collecting. Its range, apparently 

 general throughout the Northeast, extends 

 southwestward through the Ozarks, and in- 

 cludes Arkansas, Michigan, Missouri, New 

 York, Ohio, Ontario, Quebec and Tennes- 

 see. 



As explained in a previous article (Ross 

 1941^, p. 71), the type male lacks the ab- 

 domen, and the male characters are based 

 on the plesiotype male set up in that paper. 

 Since the specific characters for the female 

 of this species have not been pointed out 

 and illustrated before, I am designating a 

 specimen to represent the female sex. 



Plesio-allotype, female. — Costello Lake, 

 Algonquin Park, Ontario: July 11, 1938, 

 Cage No. 4, W. M. Sprules. 



Polycentropus elarus new species 



Male. — Length 8.5 mm. Color various 

 shades of brown, the hind tibiae not mark- 

 edly annulate, the front wings with numer- 



