36 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



eighth segment simple in structure, with 

 very long, fine hair. 



Allotype, female, — Gatlinburg, Tennes- 

 see: Sept. 4, 1940, B. D. Burks. 



Our only Illinois records are a single 

 mature male pupa taken under a damp 

 stone in the dry bed of Gibbons Creek at 

 Herod, October 7, 1937, Ross & Burks, and 

 4 larvae taken in a small, spring-fed stream 

 2 miles away. May 30, 1940, B. D. Burks. 

 These records are from the heart of the 

 Illinois Ozarks region. The main range of 

 glaberrima is in the Appalachian states ; the 

 species is known from Massachusetts, New 

 York, North Carolina, Nova Scotia, Ten- 

 nessee and Virginia. In view of this, our 

 Illinois record is a significant extension of 

 its range. 



Rhyacophila vibox Milne 



Rhyacophila vibox Milne (1936, p. 101); d^, 



Larva. — Length 1 1 mm. Body stout. 

 Head golden yellow with most of dorsal 

 area brownish; pronotum golden yellow; 

 legs and anal sclerites pale yellow. Abdomen 

 whitish with purplish blotches. 



Adults. — Length 8-10 mm. Color of 

 body and appendages various shades of 

 brown; head and wings without definite 

 pattern. Male genitalia, fig. 122, with ninth 

 tergite produced into a long dorsal process 

 bifid at apex; tenth tergite forming a com- 

 plex of small, paired plates; claspers short; 

 aedeagus with a central hook and lateral, 

 spinose lobes. Female genitalia, fig. 128, 

 with eighth sternite stocky, short and simple. 



In Illinois we have taken this species 

 only in the small, spring-fed brooks in the 

 Elgin Botanical Gardens. In view of the 

 other known captures of the species, from 

 Ontario and Quebec, it would appear that 

 the species is chiefly northern and its occur- 

 rence in Illinois represents a localized cap- 

 ture at the extreme edge of the present 

 range. 



lUInois Records. — Elgin: April 19, 

 1939, Burks & Riegel, 1 larva; May 9, 

 1939, Ross & Burks, 5 larvae; May 23, 

 1939, Burks & Riegel, 2 pupae; June 

 6, 1939, Burks & Riegel, 2 $ ; June 13, 1939, 

 Prison & Ross, 3 $ , many $ and 9 pupae ; 

 Sept. 19, 1939, Ross & Mohr, 1 larva; pre- 

 ceding Elgin records from Botanical Gar- 

 dens; Trout Spring, May 7, 1940, Burks 

 & Mohr, 4 larvae. 



Rhyacophila fuscula (Walker) 



Neuroma Juscula Walker (1852, p. 10); cT. 



This species is the most common Rhya- 

 cophila found in a large number of the 

 eastern states. It has not yet been taken in 

 Illinois, but may eventually be found within 

 the state. Known from Maine, Michigan, 

 New Brunswick, New Hampshire, New 

 York, North Carolina, Nova Scotia, On- 

 tario, Pennsylvania, Quebec, Tennessee, 

 Virginia, West Virginia. 



Rhyacophila fenestra Ross 



Rhyacophila fenestra Ross (1938a, p. 102); 

 c?, 9. 



Larva. — Fig. 133. Length 14 mm. Body 

 stocky. Head orange, spotted with brown 

 at the side, most of dorsum brown enclosing 

 an orange spot in the center of the frons; 

 pronotum, front legs and anal hooks orange, 

 pronotum with brown spots; middle and 



Fig. 133. — Rhyacophila fenestra larva. 



