August, 1944 



Ross: Caddis Flies of Illinois 



125 



Tascobia palmata (Ross) 



Stactobia palmata Ross (1938«, p. 116); d^, 

 9. 



Larva. — Length 3.5 mm. Sclerites cream 

 to dusky, with dark lines and spots along 

 sutures. 



Adult. — Size, color and structure as de- 

 scribed for genus. Male genitalia, fig. 460: 

 ninth segment forming a long internal shelf 

 open ventrally; tenth tergite membranous; 

 claspers short, ovate at apex; above them 

 arise a pair of stalked processes divided at 

 apex into three fingers; aedeagus simple and 

 tubular. Female genitalia with a ring of 

 spines at apex of eighth segment; bursa 

 copulatrix as in fig. 463. 



71 r\^ 



DELIRA 



462 



A 



463 

 B 



PALMATA 



Figs. 462-463. — Tascobia, female geni 

 A, ventral aspect; 5, bursa copulatrix. 



talia. 



Figs. 460-461. — Tascobia, male genitalia. 

 A, ventral aspect; fi, lateral aspect; C, aedea- 

 gus. 



Of the three species known in the genus, 

 only this one has been taken in Illinois. 

 Another, delira, occurs north and east of 

 the state and may be taken in future col- 

 lecting. The two species differ radically in 

 genitalia, figs. 460, 461. 



Adults have seldom been taken, but the 

 larvae are found in nurtibers in several 

 small and fairly SvVift streams, notably the 

 Sangamon and Sitlsirlawa rivers. The cases 

 are found on stoties in riffles, and the larvae 

 mature in early Spfing. Mature pupae have 

 been collected ffOftl several localities. 



Originally described from Illinois, Ken- 

 tucky, Tennessee and Wisconsin, the species 

 has since been takett iti Oklahoma. 



Illinois Records. — Apple River Can- 

 yon State Park: May 24, 1940, H. H. 

 Ross, many larvae; June 6, 1940, Mohr & 

 Burks, $ $ , $ 9 . Council Hill, Galena 

 River: June 5, 1940, Mohr & Burks, 2 

 larvae. Eddyville, Lusk Creek: May 24, 

 1940, Mohr & Burks, \$ (reared), 2$, 

 1 ? , 6 pupae, 6 larvae; June 1, 1940, B. D. 

 Burks, 4 larvae, many pupae. Galena: 

 May 23, 1940, H. H. Ross, many larvae. 

 Kankakee, Kankakee River: June 6, 1935, 

 Ross & Mohr, 2$ ; May 31, 1938, Mohr & 

 Burks, \ $ , 3 5. Mahomet, Sangamon 

 River: June 6, 1940, Ross & Riegel, many 

 pupae and larvae. Sugar Grove: June 13, 

 1939, Frison & Ross, 1 $ . 



Ochrotrichia Mosely 



Polytrichia Sibley (1926^, p. 102). Geno- 

 type, monobasic: Ithytrichia confusa Morton, 

 Preoccupied. 



