202 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



extending past R^ almost to R^ ; the lower 

 portion of the stigma is defined by Rj, which 

 is abruptly sinuate at base of stigma and 

 then curves evenly to the front margin of 

 the wing; R., curves sharply toward R^ and 

 follows parallel to it to the front margin 

 of the wing; the wing is very long and nar- 

 row and characterized by a silvery streak 

 which runs through the first and second R^ 

 cells, usually with a short spur into cell M^. 



Genotype. — Glyphopscyche avigo. 



This genus contains most of the species 

 which have previously been placed in Gly- 

 phopsyche, the genotype of which does not 

 belong here. 



Most of the species are western or Sub- 

 arctic in distribution. None have been taken 

 in Illinois. One, subborealis, occurs in the 

 eastern states and has been taken as far 

 south as central Michigan. 



Drusinus Betten 



Drusinus Betten (1934, p. 359). Genotype, 

 by original designation: Drusinus uniformis 

 Betten. 



In this genus the front wings are broad 

 and anal cells large. The genotype is the 

 only species so far collected in Illinois. The 

 larva of the genus is unknown. 



Drusinus uniformis Betten 



Drusinus uniformis Betten (1934, p. 360); 



Adults. — Length 14—16 mm. Color 

 brown, dorsum darker, front wings with 

 a distinctly purplish cast over the brown. 

 Tibiae and tarsi with numerous black spines. 

 Eighth tergite of male with a bilobed cushion 

 of black, peglike setae. Male genitalia, fig. 

 695, with elongate cerci and stocky tenth 

 tergite which is divided and upturned to 

 form a pair of black, narrow, sclerotized 

 processes. Female genitalia simple, with no 

 long processes. 



The male genitalia are very similar in 

 general structure to those of virginicus; 

 in this latter species, however, the cerci are 

 larger, and the lateral apical processes of 

 the tenth tergite are developed into a distinct 

 shoulder at base, fig. 696. 



Our only Illinois collection of this species 

 was made at Elgin, along one of the small 

 spring-fed brooks in the Botanical Gardens, 

 June 6, 1939, Burks & Riegel, 1 ^ , 1 $ . To 



696 

 A 



VIRGINICUS 



696 C 



Figs. 695-696. — Drusinus, male genitalia. 

 A, lateral aspect; B, aedeagus; C, eighth tergite. 



date we have not found the larva of this 

 species. 



Little is known regarding the range of the 

 species. It is apparently widespread but 

 local, as evidenced by the scattered available 

 records from Illinois, New York and Ten- 

 nessee. 



Neophylax McLachlan 



Neophylax McLachlan (1871, p. 111). Geno- 

 type, monobasic: Neophylax concinnus Mc- 

 Lachlan. 



Acronopsyche Banks (1930iJ, p. 227). Geno- 

 type, by original designation: Acronopsyche 

 pilosa Banks. 



In addition to characters mentioned in 

 the key, the short, triangular front wings 

 are characteristic of the adults. The larva 

 has a unique long head and usually lacks 

 the prosternal horn. 



