August, 1944 



Ross: Caddis Flies of Illinois 



191 



This species has been taken at various 

 points in the northeastern quarter of the 

 state. Dr. Betten found it abundant in the 

 ravines at Lake Forest, Illinois, but in our 

 recent collections we have taken adults only 

 in small numbers at various localities. Lloyd 

 (1921) has described the immature stages. 

 Our adult records for Illinois are scattered 

 from early June to late August. 



The range of the species occupies most of 

 the Northeast; records are available from 

 Illinois, Maine, Michigan, New Hampshire, 

 New York, Ontario and Wisconsin. 



Illinois Records. — Chicago: Aug. 3-12, 

 W. J. Gerhard, 1 ^ , 2 9, fm. Kankakee: 

 June 17, 1939, B. D. Burks, \$. Palos 

 Park: June 19, 1933, Ross & Mohr, 2 9 ; 

 Sept. 11, 1910, W. J. Gerhard, 1$, fm. 

 Seymour: June 13, 1929, Frison & Hottes, 

 U , 19. Urbana: Aug. 24, 1896, at light, 

 C. A. Hart, 1^. Waukegan: July 6, 

 1932, Frison et al., 2 $ . 



Limnephilus indivisus Walker 



Limnephilus indivisus Walker (1852, p. 34). 

 Limnephilus subguttatus Walker (1852, p. 

 34). 



Larva. — Length 20 mm. Head and pro- 

 notum with a pattern of light and dark 

 markings as in fig. 649. Legs and other scle- 

 rites yellow with indefinite brown marks. 



Case. — Length 20 mm. Constructed in 

 log-cabin style, as in fig. 833, of small twigs, 

 grass stems and other short and narrow 

 pieces. 



Adults. — Length 15-16 mm. Color in 

 general tawny to straw color, the front 

 wings with scattered irregular brown marks 

 which give a slightly banded impression. 

 Setae of head and thorax ftawny. Front 

 basitarsus longer than the succeeding seg- 

 ment. Male genitalia, fig. 658: cerci short 

 and triangular, narrow at base, the posterior 

 margin bearing sclerotized teeth, the mesal 

 face with a row of sclerotized teeth near 

 base; tenth tergite with lobes long and nar- 

 row; claspers short, lateral arms of aedea- 

 gus sclerotized, with a sharp dorsal fin. 

 Female genitalia, fig. 668, with the parts 

 compactly arranged to give the general im- 

 pression of a tube. 



Our only Illinois record of this species is 

 a single male collected at Antioch, August 

 1, 1930, Frison, Knight & Ross. The spe- 

 cies is widely distributed through the North- 

 east with about the same range as that for 



the preceding. Lloyd (1921) has described 

 the immature stages. 



Limnephiltis hyalinus Hagen 



Liynnephilus hyalinus Hagen (1861, p. 258); 

 cT. 



Larva. — Unknown. 



Adults. — Length 13-14 mm. Entire in- 

 sect straw colored except for the black 

 spines on the middle and hmd legs; front 

 wings usually without any pattern, hyaline; 

 with very sparse, short hair; sometimes with 

 faint brownish markings along the posterior 

 margin. Front basitarsus longer than suc- 

 ceeding segment. Male genitalia, fig. 657, 

 with cerci short, narrow at base, and with 

 a mesal ridge of sclerotized teeth near base, 

 this ridge, continuing faintly near ventral 

 margin to postero-ventral corner; lobes of 

 tenth tergite fairly wide but short, claspers 

 wide and short, the apex emarginate; aedea- 

 gus with lateral arms terminating in an 

 extensile membranous organ tipped with a 

 diamond-shaped brush of spines. Female 

 genitalia, fig. 665, with ninth tergite and 

 cerci short and broad, tenth segment de- 

 veloped into a pair of long and needle-like 

 processes. 



The only Illinois record for this species is 

 a single female in the Field Museum Col- 

 lection taken at Chicago, August 29, W. J. 

 Gerhard. The species has a very widespread 

 range extending across the entire northern 

 portion of the continent, with records from 

 British Columbia, Colorado, Illinois, New 

 York, the Northwest Territory (Canada) 

 and Ontario. 



Limnephilus moestus Banks 



Limnephilus moestus Banks (1908^, p. 62); 



&, 9. 



Limnephilus hingstoni Mosely (1929, p. 504); 



Larva. — Unknown. 



Adults. — Length 12-13 mm. Color dark 

 brown; front wings with cubital and anal 

 areas tawny, remainder of wing chocolate 

 brown with cream-colored spots, some of 

 these spots forming a fairly large, light area 

 around the cord. Front basitarsus of male 

 longer than succeeding segment. Male geni- 

 talia, fig. 659, with very long and slightly 

 sinuate cerci, long and pointed tenth tergite, 

 and claspers reduced to a small plate bear- 



