August. 1944 



Ross: Caddis Flies of Illinois 



183 



Glyphotaelitis Stephens 



GlyphotaeltHS Stephens (1837, p. 211). Geno- 

 type, monobasic: Limnephilus pellucidus De 

 Geer (spelled pellucidulus by Stephens). 



Glyphidotaulius Kolenati (1848, p. 36). 

 Emended name. 



ti 



Only one species has been recorded from 

 North America, hostilis. This species has 

 not been taken in Illinois but is distributed 

 throughout the Northeast. 



Astenophylax Ulmer 



Astenophylax Ulmer (1907i^, p. 51). Geno- 

 type, monobasic: Phryganea arga Harris. 



The genus contains only one species, 

 argus, which has not yet been taken in Illi- 

 nois. 



This large and very showy caddis fly has 

 been taken throughout the northeastern 

 states from Maine to Wisconsin. The wings 

 are medium brown with large areoles which 

 are almost transparent, and the apical third 

 of the wing is almost entirely transparent 

 except for the brown veins. 



Hesperophylax Banks 



Hesperophylax Banks (1916, p. 118). Geno- 

 type, by original designation: Platyphylax oc- 

 cidentalis Banks. 



The adults of this genus usually have a 

 longitudinal silvery mark on the front 

 wings; this is very prominent in the larger 

 western species. The genitalia of both sexes, 

 fig. 935, are uniform in general structure 

 throughout the entire genus. 



Of the described North American species 

 only one occurs in Illinois. 



Hesperophylax designatus (Walker) 



Limnephilus designatus Walker (1852, p. 24); 

 d', 9. 



Larva. — Length 15 mm. Head, thoracic 

 sclerites and legs yellowish brown; head and 

 pronotum speckled with irregular small 

 brown spots; legs with an orange tinge. 

 Pronotum with a transverse crease. Ab- 

 dominal gills mostly branched, the dorsal 

 gills and meso-ventral gills of the first few 

 segments with five or six branches and form- 

 ing a fan, fig. 615. First abdominal sternite 

 with many black, conspicuous setae. 



Case. — Length 18 mm., constructed chief- 

 ly of small stones and sand grains; in very 

 young forms the case is strongly tapered and 

 almost horn shaped; in mature specimens it 

 is nearly cylindrical but slightly curved. 



Adults. — Fig. 643. Length 20 mm. Color 

 brown, the wings with a definite pattern of 

 light and dark brown, and in addition a 

 silver stripe through cell first R.. Male 

 genitalia, fig. 935: claspers appearing some- 

 what triangular from lateral view; tenth 

 tergite produced into a dorso-mesal knob; 

 claspers elongate, tapering from base to a 

 narrow apex; aedeagus with a pair of 

 bunches of sclerotized, serrate and appressed 

 spurs. Female genitalia, fig. 938, without 

 conspicuous or complicated processes. 



Structurally this species is closely related 

 to others in the genus. In the past there has 

 been considerable confusion as to whether 

 or not certain forms were varieties or spe- 

 cies, but differences in the cerci and tenth 

 tergite appear to separate these clearly. A 

 key to the Nearctic species is given on page 

 281. 



Our Illinois records are all from the 

 spring-fed brooks in the Botanical Gardens 

 at Elgin. The species is very abundant in 

 this set of streams (see p. 7), and larvae, 

 pupae and adults have been collected there. 

 Our adult emergence was apparently con- 

 fined to May. 



The species is widely distributed through 

 the Northeast ; records are known from Illi- 

 nois, Michigan, New Hampshire, New 

 York, Nova Scotia, Ontario and Wisconsin. 



Fig. 643. — Hesperophylax designatus c?. 



