August, 1944 



Ross: Caddis Flies of Illinois 



57 



■^ CREPUSCULARIS 



Figs. 225-227. — Neureclipsis, female genitalia. 



row, fig. 225 validus, p. 58 



Eighth sternite without a long niesal 

 ridge, the lateral lobes short and 



wide, fig. 226 5 



5. Apex of eighth sternite projecting be- 

 yond lateral lobes the length of the 

 lobes; ninth sternite with a heavily 

 sclerotized, vasiform structure, fig. 



226 bimaculatus, p. 57 



Apex of eighth sternite projecting only 

 a short distance beyond lateral 

 lobes; ninth sternite with only in- 

 distinct structures, fig. 227 



crepuscularis, p. 57 



Neureclipsis crepuscularis (Walker) 



Brachvcentrus crepuscularis Walker (1852, 

 p. 87); 9. _ 



Neureclipsis parvula Banks (1907i^, p. 163); 



Larva. — Length 12 mm. Head, prono- 

 notum and legs straw color with black setae, 

 the head and pronotum with dark brown 

 spots; those on the frons arranged as in 

 fig. 233 ; body pale with irregular purplish 

 areas on the dorsum and lateral portion 

 of each segment. 



Adults. — Length 7.5 mm. Color reddish 

 brown, the legs and venter straw color. 

 Male genitalia, fig. 224: cerci ovate with a 

 round ventral lobe; claspers long, evenly 

 tapering from base to apex, tip curved 

 mesad ; tenth tergite long, tapering and 

 semimembranous. Female genitalia, fig. 

 227: eighth sternite with distinct corners 

 and a rounded apex projecting a distance 



beyond lateral lobes; lateral lobes fairly 

 broad, rounded at apex and with abundant 

 setae; internal sclerites of ninth segment 

 semimembranous and irregular. 



A study of large series of males and 

 females leaves no doubt regarding the asso- 

 ciation of the two sexes, thus upholding 

 the synonymy of parvula with crepuscularis, 

 as proposed by Milne (1936). 



In Illinois this species is widely distrib- 

 uted over the entire state. It is most abun- 

 dant along the larger rivers. It is seldom 

 taken in large numbers, but we have at 

 times captured large series along the Mis- 

 sissippi River. The adults emerge over a 

 wide period; our records extend from May 

 3 to October 2. The association of larvae 

 and adults is made on the basis of mature 

 pupae collected in Wisconsin and Indiana. 



The range of the species includes most 

 of the Northeast, with a southwestward 

 extension through the Ozarks. We have 

 records from Arkansas, Illinois, Indiana, 

 Kentucky, Michigan, Missouri, New Bruns- 

 wick, New York, North Carolina, Nova 

 Scotia, Ohio, Pennsylvania, Tennessee, Vir- 

 ginia and Wisconsin. 



Illinois Records. — Many males and fe- 

 males, taken May 3 to October 2, are from 

 Alton, Champaign, Danville, Deer Grove 

 (Green River), Elizabethtown, Florence, 

 Fort Massac State Park, Grafton (wing 

 dam). Grand Tower, Hardin (Illinois 

 River), Harrisburg, Havana (Spoon Riv- 

 er), Homer (Salt Fork River), Kamps- 

 ville, Kankakee, Keithsburg, La Rue (Mc- 

 Cann Spring), Milan (Rock River), Mo- 

 mence (Kankakee River), Monticello, 

 Mount Carmel, Morris, Oakwood, Pontiac, 

 Quincy (Burton Creek), Rock Island, Rosi- 

 clare. Savanna, Serena (Indian Creek), 

 Sterling, Venedy Station (Kaskaskia River). 



Neureclipsis bimaculatus (Linnaeus) 



Phryganea bimaculata Linnaeus (1758, p. 

 548). 



Larva. — Similar to that of crepuscularis, 

 according to Ulmer (1909, p. 229). 



Adults. — Length 7.5-9.0 mm. Color 

 brown, the venter and legs straw color. 

 Male genitalia, fig. 223: cerci ribbon-like, 

 produced into long, fairly straight ribbons as 

 long as claspers; claspers slender, elongate 

 and straight; tenth tergite semimembranous, 

 long and slightly rounded at apex ; aedeagus 



