August, 1944 



Ross: Caddis Flies of Illinois 



83 



Sternal plates of eighth segment sep- 

 arated only two-thirds distance to 



base of segment, fig. 390 



Hydropsyche, p. 86 



Parapsyche Better) 



Parapsyche Betten (1934, p. 181). Geno- 

 type, monobasic: Arctopsyche apicalis Banks. 



No species of this genus have been re- 

 corded from Illinois. Two species, apicalis 

 and cardis, are recorded from the eastern 

 states. 



Arctopsyche McLachlan 



Arctopsyche McLachlan (1868, p. 300). Gen- 

 otype, monobasic: Aphelocheira ladogensis Kol- 

 enati. 



As with the preceding, no species of this 

 genus have been taken in Illinois. Two east- 

 ern species, ladogensis and irrorata, have 

 been recorded from the eastern states and 

 eastern Canada. 



Oropsyche Ross 



Oropsyche Ross (1941^, p. 79). Genotype, 

 by original designation: Oropsyche howellae 

 Ross. 



This primitive genus has not yet been 

 taken from Illinois and is known only from 



Fig. 336. — Oropsyche howellae, male geni- 

 talia. A, lateral aspect; B, aedeagus, ventral 

 aspect; C, tenth tergite. 



the genotype, described from North Caro- 

 lina. The distinctive genitalia, fig. 336, will 

 serve to verify identifications of this species. 



A phro psyche Ross 



Aphropsyche Ross (1941i^, p. 78). Genotype, 

 by original designation: Aphropsyche aprilis 

 Ross. 



Only one species of this genus is known, 

 the genotype, described from Tennessee. 

 The male genitalia, fig. 337, are distinctive. 



Fig. 337. — Aphropsyche aprilis, male geni- 

 talia. A, lateral aspect; B and C, aedeagus, 

 dorsal and lateral aspects. 



Although we have no definite adult record 

 for this species in Illinois, there is consider- 

 able suspicion that the larva of the genotype 

 might be Genus A described below. This 

 larva was found in the stream at Parksville, 

 Tennessee, along which the type series of 

 the genotype was collected. 



Hydropsychid Genus A 



Larva. — Fig. 338. Head bright brownish 

 yellow with a few darker suffusions along 

 the frontal area; thoracic shields and legs 

 brownish yellow with irregular darker 

 markings. Head with gula small and tri- 

 angular, frontal area without prominent 

 carinae ; mandibles stout, fig. 282, the left 



Fig. 338. — Hydropsychid Genus A, head. 



