176 



Illinois Natural History Survey Bulletin 



Fol. 23, Art. 1 



Phryganea sayi Milne 



Phryganea interrupla Say (1828, pi. 44); pre- 

 occupied. 



Phryganea sayi Milne (1931, p. 228). New 

 name. 



Larva and Case. — Indistinguishable from 

 those of cinerea. 



Adults. — Length 20-25 mm. In color 

 similar to cinerea, differing chiefly in the 

 hind vikings, which are grayish yellow with 

 the apical third dark brown and forming a 

 distinct band. Male genitalia, fig. 603, with 

 the tenth tergite much broader and shorter 

 than in cinerea. Female genitalia very sim- 

 ilar to those of cinerea in regard to both 

 external and internal parts. 



We have scattered records of this species 

 from the northern half of Illinois. Larvae 

 were collected and reared from the Dead 

 River at Zion, in company with those of 

 cinerea. Our adult records extend from 

 June 6 to August 27. Indications are that 

 this species has a longer adult life than many 

 caddis fly species. The larva illustrated for 

 this species by Lloyd (1921) is apparently 

 a misidentification; his larva, described un- 

 der the old name interrupta, has diagonal 

 marks on the pronotum, whereas Vorhies 

 (1909) found (and we did, also) that the 

 marks followed the margin as in cinerea. I 

 do not know what species Lloyd actually 

 had. 



The range of the species is apparently 

 confined principally to the Northeast. Rec- 

 ords are available from the District of 

 Columbia, Illinois, Massachusetts, Michi- 

 gan, Missouri, New Jersey, New York, 

 Pennsylvania and Wisconsin. 



Illinois Records. — Algonquin: Aug. 27, 

 1908, 1$. Havana: June 12, 1894, C. A. 

 Hart, 1 $ ; June 14, 1894, C. A. Hart, 1 9 ; 

 June 23, 1894, C. A. Hart, 1 i . Oakwood, 

 Salt Fork River: July 18, 1933, Ross & 

 Mohr, 1$. Springfield: July 2, 1885, at 

 light, C. A. Hart, 19. Urbana: Aug. 2, 

 1886, at light, C. A. Hart, 1 5 ; Aug. 

 18, 1886, at light, C. A. Hart, 1 9 ; Aug. 23, 

 1886, at light, C. A. Hart, 1 6 ; Aug. 

 22, 1938, G. T. Riegel, light trap, 19. 

 Zion, Dead River: June 6, 1940, Mohr & 

 Burks, U , 19; June 12, 1940, Mohr 

 & Burks, M (reared); June 16, 1940, 

 Mohr & Burks, 1 ^ (reared), 1 9 (reared), 

 2$, 29 ; June 28, 1940, Mohr & Burks, 

 \$; July 1, 1940, Mohr & Burks, 19; 

 July 15, 1940, Mohr & Burks, \$. 



LIMNEPHILIDAE 



This is one of the largest families of 

 caddis flies in North America, represented 

 by over 20 genera and nearly 200 species. 

 It is characterized by having the maxillary 

 palpi of the male three segmented, by dis- 

 tinct ocelli in both sexes, and other struc- 

 tural characters as outlined in the key. 

 The larvae are quite variable in many char- 

 acters, but in all of them the antennae are 

 situated midway between the eye and the 

 base of the mandible. All species are case 

 makers, many of which are illustrated by 

 Lloyd (1921). 



Discovery of its larva shows that the 

 genus Neothremma, previously placed in 

 the Sericostomatidae, belongs definitely in 

 the Limnephilidae. The genus Farula also 

 was placed in the Sericostomatidae, but since 

 it possesses distinct ocelli, I am removing it 

 tentatively to the Limnephilidae. 



Most of the genera and species of the 

 Limnephilidae are western or northern in 

 distribution, and Illinois occurs on the south- 

 ern fringe of the main range of the family. 

 Only a small proportion of the species have 

 been taken in Illinois, and many of these 

 are rare or locally distributed. 



In many cases the genera are only im- 

 perfectly defined, and we are awaiting in- 

 formation on females or larvae, which are 

 as yet unknown for many genera and species. 



KEY TO GENERA 



Larvae 



1. Anterior margin of mesonotum with a 



mesal, rectangular emargination, 

 fig. 606; at this point it is connected 

 to pronotum by a short, sclerotized 

 strap; head with malar space nearly 

 twice height of head above eye, fig. 



609 Neophylax, p. 202 



Anterior margin of mesonotum evenly 

 rounded and not emarginate, fig. 

 607; head with malar space no longer 

 than height of head above eye, fig. 

 610 ^ 2 



2. Front femora slender, the apical mar- 



gin short, fig. 611; pronotum slightly 

 incised along anterior margin; 

 always with sclerotized portions of 

 head and body black or nearly so. . 



Dicosmoecus, p. 181 



Front femora somewhat chelicerate, 

 widened, with the apical margin 

 very oblique and nearly as long as 

 the lower margin, fig. 612 3 



