August, 1944 



Ross: Caddis Flies of Illinois 



159 



Neotrichia vibrans Ross 



Neotrichia vibrans Ross (1938rt, p. 119); cf. 



Adults. — Length 2 mm. Body and ap- 

 pendages mottled with black, brown and 

 whitish. Male genitalia, fig. 548: eighth 

 sternite with an apico-mesal lobe; genitalia 

 with claspers small, curved and hooklike, 

 arising from a platelike, basal sclerite; tenth 

 tergite produced into a pair of widely diver- 

 gent pointed lobes; lateral appendages long 

 and fusiform ; aedeagus with a broad base, 

 very narrow neck bearing a long, slightly 

 curved, spiral process, and a long, narrow 

 apical portion which has its tip enlarged and 

 ovate, and bears a pair of prominent setae. 

 Female genitalia similar to those of okopa 

 in structure of eighth segment and bursa 

 copulatrix ; differing in lacking dark colora- 

 tion so that the sternite has no distinct pat- 

 tern. 



Allotype, female. — Hollister, Missouri: 

 July 14, 1938, Mrs. Vitae Kite. 



Originally described from a single male 

 from Oakwood, Illinois, this species has 

 since been collected in large numbers at 

 Hollister, Missouri. The Illinois records in- 

 dicate a preference for small, clear streams. 

 Little can be said regarding the range of the 

 species. 



Illinois Records. — Muncie: June 27, 

 1932, H. H. Ross, 1 9 . Oakwood, Middle 

 Pork River: Sept. 7, 1936, DeLong & Ross, 



u. 



Neotrichia falca Ross 



Neotrichia Jalca Ross (1938rt, p. 119); d" . 



Adults. — Length 2.5 mm. Color a salt- 

 and-pepper mixture of cream and brown. 

 Male genitalia, fig. 544: tenth tergite mem- 

 branous; cerci long, slightly sinuate and with 

 sparse setae; claspers short, the apical mar- 

 gin steplike and with two black, sclerotized 

 cushions; above them membranous folds end 

 in a pair of blunt black lobes and a pair of 

 small black hooks; above these are a pair of 

 ovate membranous lobes tipped by a seta; 

 aedeagus with flared base, a long finger-like 

 lobe rising from neck and a slender, curved 

 apical portion with two teeth which are al- 

 most superimposed one over the other. Fe- 

 male genitalia, fig. 552: eighth sternite with 

 a central sclerite with arcuate apical margin 

 and a minute incision at tip; bursa copu- 

 latrix as in fig. 5525. 



Allotype, female. — Quincy, Illinois, 

 stream near Cave Spring: July 6, 1939, 

 Mohr & Riegel. 



We have taken this species in scattered 

 localities in the northern two-thirds of the 

 state, in every case along a small and fairly 

 clear stream. Adult emergence is continu- 

 ous throughout the warmer months, with 

 records from June through most of Septem- 

 ber. No collections are known outside Illi- 

 nois. 



Illinois Records. — Council Hill, Ga- 

 lena River: June 26, 1940, Mohr & Riegel, 

 \$. Momence: June 22, 1938, Ross & 

 Burks, $ $, 9 9. Muncie, Stony Creek: 

 Sept. 20, 1935, Frison & Mohr, 1 $ . Quin- 

 cy: stream near Cave Spring, July 6, 1939, 

 Mohr & Riegel, $ $ , 9 9; Burton Creek, 

 June 25, 1940, Mohr & Riegel, 1 9 . Sugar 

 Grove: June 13, 1939, Frison & Ross, 1 i . 

 White Pines Forest State Park: Aug. 

 13, 1937, Ross & Burks, 49. 



Neotrichia riegeli Ross 



Neotrichia riegeli Ross (1941^, p. 61); cf', 9. 



Adults. — Length 2.0-2.5 mm. Straw col- 

 ored, with irregular light brown marks on 

 body and wings. Male genitalia, fig. 545: 

 similar in general structure to falca; clasp- 

 ers short, nearly quadrate, with a dense 

 black area at apex; above, the black hooks 

 are large with a black cushion at base; aede- 

 agus with sclerotized hooks set one beyond 

 the other. Female genitalia, fig. 551 : eighth 

 sternite with a large, sclerotized mesal lobe 

 with the arcuate apical margin thickened; 

 bursa copulatrix as in fig. 5515. 



This species is known only from the type 

 series, containing a large collection of males 

 and females, from Lusk Creek near Eddy- 

 ville, Illinois, June 19-20, Mohr & Riegel. 

 Mature pupae also were collected here, link- 

 ing larval and adult forms. This set was 

 taken in company with collata and okopa. 



Neotrichia collata Morton 



Neotrichia collata Morton (1905, p. 72); cT, 

 9. 



Adults. — Size 2.0-2.5 mm. Color mottled 

 brown and tawny. Male genitalia, fig. 543: 

 tenth tergite membranous; cerci fairly long; 

 claspers long and tapering, with a small 

 mesal tooth at apex; above it is a rectangu- 

 lar plate with a pair of apical setae; aedea- 



