August, 1944 



Ross: Caddis Flies of Illinois 



175 



but with no suggestion of an apical 

 band cinerea, p. 175 



Phryganea cinerea Walker 



Phryganea cinerea Walker (1852, p. 4); cf, 

 9. 



Larva. — Fig. 561. Length 35 mm. Head, 

 pronotum and legs yellow; head with a 

 mesal dark line down the frons, a pair of 

 oblique dark lines, one on each side of the 

 frons; and a second pair of dark lines, one 

 along each lateral margin of the head. Pro- 

 notum with anterior and posterior margins 

 black, the two lines frequently meeting on 

 meson. 



Case. — Very long, usually 65-70 mm., 

 and of the usual spiral type of construction. 



604 

 A 



CINEREA 



Figs. 603-604. — Phryganea, male genitalia. 

 A, lateral aspect; B, claspers, ventral aspect. 



Fig. 605. — Phryganea cinerea, female geni- 

 talia. 



Adults. — Length 21-25 mm. Color pre- 

 dominantly gray or brown, the front wings 

 with an irregular pattern of various shades 

 of brown with light gray patches along the 

 posterior margin, these forming triangular 

 marks when the wings are folded; hind 

 wings uniformly gray, with a few slightly 

 darker darts along the extreme tips of the 

 veins. Male genitalia, fig. 604: tenth ter- 

 gite divided into a pair of cercus-like organs 

 with a short but broad dorsal spur and a 

 group of stout, black spines at apex ; clasp- 

 ers short, somewhat spoon shaped as seen 

 from lateral view, rounded and biscuit 

 shaped as seen from ventral view. Female 

 genitalia, fig. 605, characterized by the tri- 

 dentate apex. 



In Illinois we have taken this species only 

 in the northeastern part of the state where 

 it is apparently confined to glacial lakes and 

 marshes. We reared the species from the 

 Dead River at Zion, where the larvae were 

 taken in aquatic smartweed beds in company 

 with sayi (see p. 11). Our adult records 

 are chiefly from June and July, indicating 

 a heavy early summer emergence with strag- 

 glers beyond that time. 



The adults are crepuscular, flying chiefly 

 in the first hours after dark. During the 

 day they rest on rushes and sedges around 

 lakes or marshes. When at rest, with wings 

 folded, they blend into their surroundings. 



The species is widely distributed through 

 the northern states and Canada, extending 

 as far west as the Rocky Mountains; our 

 Illinois records represent apparently the 

 most southern points at which the species 

 has been taken. Records are available for 

 Alberta, Colorado, Illinois, Maine, Mani- 

 toba, Massachusetts, Michigan, Minnesota, 

 Montana, New York, Ontario, Saskatche- 

 wan, South Dakota, Wisconsin and Wyo- 

 ming. 



Illinois Records. — Antioch : July 1, 

 1931, Frison, Betten & Ross, \$, 1$. 

 Channel Lake: Aug. 13, 1906, 1 $ . Chi- 

 cago: Wescott, \$. Fox Lake: July 1, 

 1931, Frison, Betten & Ross, 1 $ ; June 30, 

 1935, DeLong & Ross, 3 <J . Grass Lake: 

 July 1, 1926, Frison & Hayes, \$, 1$. 

 Northern Illinois: July 28, 1898, 19. 

 ZiON, Dead River: July 7, 1937, Frison & 

 Ross, 4<J, 1$; June 12, 1940, Mohr & 

 Burks, 1 2 (reared) ; June 28, 1940, Mohr 

 & Riegel, 3^, 2$ ; June 16, 1940, Mohr 

 & Burks, 4,5, 3$, 1 <? (reared); July 1, 

 1940, Mohr & Burks, 1 9 . 



