192 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



ing numerous short setae and a few long 

 ones. Female genitalia similar to those in 

 fig. 666, with cerci and tenth segment long, 

 and ninth sternite developed into a pair of 

 long, finger-like processes. 



We have only one record of this species 

 in Illinois, a male collected at Dixon, at 

 lights along the Rock River, June 27, 1935, 

 DeLong & Ross. The species is widespread 

 through the northern part of the continent 

 from Greenland to Colorado, with records 

 from Colorado, Greenland, Illinois, New- 

 foundland, Nova Scotia, Ontario, Quebec 

 and Wisconsin. 



Litnnephilus sericeus (Say) 



Phryganea sericeus Say (1824, p. 309). 



Limnephilus despectus Walker (1852, p. 31); 

 cT, 9. New synonymy. 



Limnephilus multijarius Walker (1852, p. 

 32); 9. New synonymy. 



Limnephilus perjoratus Walker (1852, p. 33); 

 ?. New synonymy. 



Limnephilus eminens Betten (1934, p. 323); 

 d^. New synonymy. 



This species has not been taken in Illinois 

 but occurs to the north from Alaska to 

 New York. Records are available for 

 Alaska, Minnesota, New York, Northwest 

 Territory (Canada), Ontario, Pennsylvania 

 and Quebec. 



I am designating as a neotype a female 

 from Duluth, Minnesota, well differentiated 

 on the basis of its genitalia, fig. 664, and 

 characters given in the preceding key. The 

 species was originally described from the old 

 Northwest Territory, which included Min- 

 nesota. Of the various species known from 

 that general region, this particular one fits 

 Say's description quite well, especially in the 

 unusual black mark on the forewing. 



Neotype, female. — Duluth, Minnesota. 



Limnephilus submonilifer Walker 



Limnephilus submonilifer Walker (1852, p 

 33); 9. 



Limnephilus pudicus Hagen (1861, p. 262); 

 cf. 



Larva. — Length 16-17 mm. Head, tho- 

 racic sclerites and legs fairly dark brown; 

 head with frons almost entirely brown and 

 with small light patches at apex and sides, 

 dorso-lateral portions variegated with yel- 

 lowish brown; legs lighter yellowish brown 

 than the head. See fig. 20, page 20. 



Case. — Length 16-20 mm., made of leaf 

 and grass stem fragments neatly arranged 

 in linear order to form a fairly loosely con- 

 structed straight and almost cylindrical case. 



Adults. — Length 13-16 mm., slender. 

 Color brown, the dorsum darker and the 

 wings variegated with irregular lighter 

 and darker spots; leg spines black. Head 

 and thorax armed dorsad with long, stout 

 macrochaetae. Front legs with a linear 

 brush of stout, black spines on underside of 

 femur and tibia; basitarsus only one-half 

 length of next segment. Male genitalia, fig. 

 652, with cerci and claspers triangular, tenth 

 tergite short and hooked dorsad, aedeagus 

 with lateral arms sclerotized, filiform, very 

 long and tipped with a small row of short 

 spurs. Female genitalia, fig. 662, with ninth 

 and tenth segments and cerci fused to form a 

 single tubular structure. 



This is our common temporary pond and 

 marsh species in Illinois. We have taken it 

 at scattered localities throughout the state, 

 especially in the temporary ponds along rail- 

 road rights-of-way and in shallow spring 

 marsh ponds in the northeastern corner of 

 the state. In these situations the larvae are 

 difficult to see since they build their cases 

 from the dead grass stems and leaves in the 

 bottom of the ponds, and, although they 

 frequently practically cover the bottom, it 

 is scarcely possible to detect them until they 

 move. 



This species has two very definite genera- 

 tions, at least in the general region of Illi- 

 nois. The first matures early in spring, 

 in the vicinity of Urbana the adults emerg- 

 ing about the first of May. Soon after this 

 date the ponds invariably dry up, filling up 

 again with the late summer rains. When 

 this occurs, a second generation is developed 

 which matures into the adults in late August 

 and September. This same phenomenon has 

 been noticed by previous writers. Vorhies 

 gave evidence of this two-brooded habit 

 from Wisconsin material, and Betten ob- 

 served the same phenomenon in his studies 

 with the species in the vicinity of Lake 

 Forest, Illinois. 



The range of the species is extensive to 

 the north and east of Illinois; records in- 

 clude the District of Columbia, Illinois, 

 Indiana, Maine, Maryland, Massachusetts, 

 Michigan, Newfoundland, New Hampshire, 

 New York, Ohio, Ontario, Quebec, Rhode 

 Island, South Dakota and Wisconsin. 



Illinois Records. — Many males, females 



