August, 1944 



Ross: Caddis Flies of Illinois 



189 



slightly emarginate at apex, fig. 664 



sericeus, p. 192 



Dorsal portion of tenth tergite either 

 divided at least half way to base, 

 fig. 665, or not much produced be- 

 yond ventral margin 14 



14. Dorsal portion of tenth segment modi- 



fied into a pair of narrow, needle- 

 like blades, fig. 665. . . .hyalinus, p. 191 

 Dorsal portion of tenth segment with 

 wide blades, fig. 666 15 



15. Ninth sternite prolonged into long, 



finger-like processes, the apices of 

 which are separated by half the 

 width of the segment, as in fig. 666 



moestus, p. 191 



Ninth sternite forming a pair of short, 

 stocky processes, figs. 667-671.... 16 



16. Cerci long, slender, spindly, and wide- 



ly separated to base, tenth tergite 

 very much stouter, its halves ap- 



pressed, fig. 667 rhombicus, p. 190 



Cerci stout, shorter and wider, fig. 

 668, tenth tergite not stouter than 

 cerci 17 



17. Cerci close together at base and apex, 



forming with the tenth segment a 

 definitely conical structure, fig. 668 



indivisus, p. 191 



Cerci either diverging, fig. 671, or wide 

 apart at base, fig. 669 18 



18. Ninth tergite with only a small scle- 



rotized button, cerci wide apart at 

 base; ninth sternite with lobes 

 rounded ventrad, tenth tergite with 

 lateral halves solid and pyramidal, 



fig. 669 consocius, p. 190 



Ninth tergite with a fairly large, tri- 

 angular sclerite, cerci fairly close 

 together at base; ninth sternite with 

 lobes angular ventrad, tenth tergite 

 with lateral halves thin and curved, 

 fig. 671 19 



19. Cerci with a large, nearly bulbous 



basal portion which narrows to a 



small, short apex, fig. 670 



bimaculatus, p. 189 



Cerci with a small basal portion and 



a long, thin apex, fig. 671 



sordidus, p. 1 89 



Ltmnephilus sordidus (Hagen) 



Anabolia sordida Hagen (1861, p. 264); cf. 

 AnaboUa longicercus Denning (1941rt, p. 

 195); 0^,9. 



Larva. — Unknown. * 



Adults. — Length 16-18 mm. Color dark 

 reddish brown, the dorsum and antennae al- 

 most black, the front wings very dark brown 



with irregular light dots scattered over the 

 entire surface of the wing, giving it a salt- 

 and-pepper appearance. Head and thorax 

 with black dorsal macrochaetae, those on 

 head sparse. Front basitarsus of male much 

 longer than succeeding segment. Male geni- 

 talia, fig. 660, with long cerci which are 

 narrowed at apex and have a few small 

 sclerotized teeth along the apico-mesal mar- 

 gin; lobes of tenth tergite also long and 

 reaching nearly to apex of cerci; claspers 

 smooth, long and sharp; lateral arms of 

 aedeagus sclerotized, curved, widened and 

 obliquely truncate at apex. Female geni- 

 talia, fig. 671, with ninth tergite triangular, 

 cerci long and diverging, lateral halves of 

 tenth segment thin and long, ninth sternite 

 produced into large angulate protuberances. 



Our only Illinois record of this species 

 is a female collected at Galena, Illinois, 

 bearing the number 1062; this specimen was 

 recorded by Hagen and is probably part of 

 the Kennicott Collection. 



The range of this species is poorly under- 

 stood. It was originally described from the 

 Red River valley (North Dakota-Minne- 

 sota), but undoubtedly specimens of this 

 species had been recorded under the name 

 bimaculatus, and few definite locality rec- 

 ords can be given until this material is re- 

 studied. 



Ltmnephilus bimaculatus Walker 



Ltmnephilus bimaculatus Walker (1852, p. 

 30); d^. 



This species occurs throughout the north- 

 ern states from Colorado to the Atlantic 

 Coast. Betten mentions a record from 

 northern Illinois in Hagen's specimens, but 

 these specimens are the preceding species, 

 sordidus. We have no definite Illinois rec- 

 ords of this species, although it might be 

 taken in future collections. 



Limnephilus ornatus Banks 



Limnephilus ornatus Banks (1897, p. 27); 9. 

 Limnephilus elegans Mosely (1929, p. 504); 



Larva. — Unknown. 



Adults. — Length 17-18 mm. Color yel- 

 lowish brown, the front wings with longi- 

 tudinal silvery stripes which contrast with 

 the chocolate brown ground color. Dorsum 

 of head and thorax with a mixture of tawny 



