190 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



and silvery setae. Front basitarsus of male 

 longer than second segment. Male genitalia, 

 fig. 653, with cerci deeply incised to form 

 long dorsal and ventral lobes; tenth tergite 

 large and stocky; claspers with wide base 

 and fairly long apical portion; lateral arms 

 of aedeagus with a wide foliaceous apex 

 bearing rows of spines. Female genitalia, 

 fig. 663, with cerci long and slender, tenth 

 segment short and forming a wide tube. 



Dr. Betten (1934) reports this species 

 from Lake Forest, Illinois, in June. In 

 addition to this record, we have a single 

 female bearing the data "Northern Illinois," 

 a male collected at Zion, Illinois, June 26, 

 1936, Frison & DeLong, and a female col- 

 lected at Chicago, Illinois, May 17, W. J. 

 Gerhard, fm. 



The species has been recorded from scat- 

 tered localities over a very wide range from 

 Greenland, across America, to Japan; on 

 the North American continent records are 

 available for Alaska, Illinois, Maine, Mas- 

 sachusetts, Newfoundland, New Hampshire, 

 New York and Ontario. 



Limnephilus rhombicus (Linnaeus) 



Phryganea rhombica Linnaeus (1758, p. 548). 

 Limnephilus combinatiis Walker (1852, p. 

 28); d^. 



Larva. — Length 20 mm. Head, thoracic 

 sclerites and legs yellowish brown with scat- 

 tered brown dots; head with a distinct 

 brown area down the center of the frons, 

 a pair of brown lines on each side of the 

 frons, and an irregular brown area occupy- 

 ing much of the lateral and ventral portions 

 of the head; pronotum sometimes with an- 

 terior half dark. 



Case. — Fig. 672. Length 20 mm., stout 

 and round, constructed of short wood frag- 

 ments woven together in an irregular pat- 

 tern. 



Adults. — Length 19-20 mm. Color 

 brownish yellow, the wings with a distinct 

 pattern of cream color and chocolate brown 

 arranged in somewhat oblique stripes. Head 

 and thorax armed with silvery or tawny mac- 

 rochaetae. Front basitarsus of male longer 

 than succeeding segment. Male genitalia, 

 fig. 654, with very long, wide cerci which 

 have a row of ventro-mesal sclerotized 

 teeth; tenth tergite very small, claspers 

 small. Female genitalia, fig. 667, with mi- 

 nute ninth tergite, long and spindly cerci and 

 stout tenth segment. 



We have taken this species in Illinois 

 only in the spring-fed brooks in the Botani- 

 cal Gardens at Elgin (see p. 7). To date 

 we have actually captured only three larvae 

 and one female of this species there, so that 

 it is a rarity with us. 



This species is widely distributed through- 

 out the Northeast. All stages were described 



Fig. 672. — Limnephilus rhombicus^ case. 



by Vorhies (1909) and Lloyd (1921), and 

 records are available from Greenland, Illi- 

 nois, Maine, Newfoundland, New York, 

 Saskatchewan and Wisconsin, in addition to 

 records from Eurasia. 



Illinois Records. — Elgin : Botanical 

 Gardens, June 19, 1939, H. H. Ross, 1 5 ; 

 Trout Spring, March 7, 1940, Burks & 

 Mohr, 3 larvae. 



Limnephilus consocius Walker 

 Limnephilus consocius Walker (1852, p. 33); 



d". 



Colpotaulius medialis Banks (1905^, p. 8); 



d'. 



Larva. — Length 20 mm. Head and pro- 

 notum yellow, with small brown spots scat- 

 tered over the entire surface, fig. 646. Other 

 sclerites yellow with variable brown spots. 



Case. — Length 20 mm. Constructed chief- 

 ly of wood and leaf fragments, irregular in 

 outline, but fairly stoutly constructed. 



Adults. — Length 14—16 mm. Color al- 

 most entirely a rich reddish brown, the front 

 wings finely marbled with a darker shade 

 of brown but without a definite pattern. 

 Setae of head and thorax reddish brown. 

 Front basitarsus longer than the succeeding 

 segment. Male genitalia, fig. 656, with cerci 

 short and broad at apex, the posterior mar- 

 gin heavily sclerotized along the mesal edge; 

 claspers narrow, with a pair of sclerotized 

 points at apex; tenth tergite projecting be- 

 yond cerci; aedeagus with stout, curved, 

 spinose, lateral arms. Female genitalia, fig. 

 669, with cerci stout and tenth tergite with 

 the lateral halves thick and pyramidal; ninth 

 sternite developed into large rounded pro- 

 tuberances. 



