August, 1944 



Ross: Caddis Flies of Illinois 



217 



Wings either with spots larger or less 

 contrasting, figs. 754, 758 10 



10. Wings with a dorsal pattern of V- 



marks, fig. 754, formed by dark areas 

 along the posterior margin of the 



wings 11 



Wings without conspicuous dark marks 

 on posterior margin, therefore with- 

 out dorsal V-marks when the wings 



are folded in repose, fig. 758 



r. .albida, p. 220 



11. Wings chalky white, with conspicuous 



shoulder marks, spots contrasting 

 and eyes occupying most of lateral 



aspect of head spiloma, p. 219 



Ground color of wings slightly tawny, 

 shoulder mark usually absent and 

 spots not as dark; eyes smaller, not 

 occupying most of lateral aspect of 

 head diarina, p. 218 



Leptocella Candida (Hagen) 

 Setodes Candida Hagen (1861, p. 280); cf. 



L.ARVA. — Length 12 mm. Head and tho- 

 racic sclerites mottled with yellow and 

 brown, as in fig. 748, the frons always with 

 the upper portion almost entirely brown; 

 legs entirely yellow, sometimes with very 

 narrow dark lines at the joints. Hind legs 

 with a long swimming brush of fine hair. 



Case. — About 20 mm. long, constructed 

 of wood and leaf fragments molded into a 

 fairly smooth exterior, frequently with one 

 to several long twigs cemented to side; be- 

 fore pupation the case is reduced in length. 



Adults. — Length 15 mm. Head and scle- 

 rites tawny, covered with white hair. Wing 

 membrane transparent, with a definite pat- 

 tern from a covering of hair; front wings 

 white with rows of gray and black marks, 

 and having four conspicuous tufts of black 

 hair along the hind margin at apex, as in 

 fig. 757. Male genitalia, fig. 751: ninth 

 segment more or less cylindrical, produced 

 into a meso-dorsal hood, below which arise 

 a pair of long fingers; tenth tergite almost 

 ventral in position, broad at base and taper- 

 ing to a slightly upturned and narrow apex; 

 at the base of the tenth tergite arise a pair 

 of filaments curved like a swan's neck and 

 expanded at apex into a reticulate plate ; 

 claspers narrow at base, with a slight pro- 

 jection of the ventral margin, this entire 

 margin bearing rows of long setae; at apex 

 the clasper is divided into a subapical, spoon- 

 like, sclerotized mesal lobe and a lateral 

 apical lobe with a very oblique margin 



clothed with very long setae; between the 

 bases of the claspers arise a pair of very 

 short lobes bearing two or three setae at 

 apex ; aedeagus membranous with a spoon- 

 shaped ventral sclerite. Female genitalia 

 very simple, consisting of one or two incon- 

 spicuous pairs of lobes. 



Allotype, female. — Momence, Illinois: 

 Aug. 16, 1938, Ross & Burks. 



This species is widely distributed over the 

 state. It frequents a wide variety of streams 

 and rivers, ranging from Quiver Creek to 

 the Mississippi River and has been found 

 also in marshes adjoining these streams. 

 Adult emergence continues from early June 

 to late August, indicating more than one 

 generation per year. Both adults and larvae 

 are frequently taken in large numbers. 

 Reared collections of larvae from Quiver 

 Creek have established the association of 

 larval and adult forms. 



This species ranges through the central 

 and southern states, with records from 

 Florida, Illinois, Indiana, Iowa, Kentucky 

 and Ohio. 



Illinois Records. — Many males and fe- 

 males and three pupae, taken May 28 to 

 September 20, and many larvae and four 

 cases, taken May 14 to August 21, are from 

 Council Hill (Galena River), Deer Grove 

 (Green River), Dixon, East Dubuque, Eliz- 

 abethtown, Erie (Rock Creek), Freeport, 

 Hamilton, Havana (Quiver Creek), Henry, 

 Hillsdale, Homer, Jackson Island (in Mis- 

 sissippi River opposite Hannibal, Missouri), 

 Kampsville, Kankakee, Keithsburg, Milan, 

 Momence (Kankakee River), Mount Car- 

 mel, Oakwood, Pontiac, Quincy, Rockford, 

 Rock Island, Rosiclare, St. Joseph, Savanna, 

 Shawneetown, Shelbyville, Vandalia, and 

 Wilmington. 



Leptocella exquisita (Walker) 



Leptocerus exquisita Walker (1852, p. 72); 

 9. 



Larva (not reared, see below). — Length 

 12 mm. Head and thoracic sclerites mottled 

 with yellow and light brown to form pat- 

 tern as in fig. 746; front legs and all coxae 

 yellow, middle and hind legs mostly black 

 beyond coxae. 



Case. — Length 20 mm., made of wood 

 fragments and similar in general to that of 

 Candida. 



Adults. — Length 17 mm., the female usu- 

 ally not over 11 mm. Head and thorax 



