257 

 Denning: Trichoptera 



Fig. 10:27. Male genitalia, a, Hesperophylax incisus, lateral; Oj, tenth tergite, lateral; b, 

 H. occidenfa/is, lateral; b,, tenth tergite, lateral; c, H. magnus, lateral; c 1( tenth tergite, lateral; 

 a", Desmond bethula, male genitalia, lateral; n\, aedeagus; e, Banksiola crotchi, male genitalia, 

 lateral; e, claspers, ventral (o-c, Ross, 1944; d. Denning, 1954a; e, Celeste Green, 1955). 



3. Mesonotum with a pair of small sclerites near anterior 

 margin 4 



— Mesonotum without a pair of sclerites, sometimes 

 with a very small sclerotized area around the base of 

 1 seta 5 



4. Mature larvae attaining length of 30 mm 



Eubasilissa Martynov 1930 



— Mature larvae attaining length of only 20 mm 



Oligostomis Kolenati 1848 



5. Pronotum with anterior margin black, and without a 

 diagonal black line Agrypnia vestita (Walker) 1852 



— Pronotum with a diagonal black line, anterior margin 

 mostly yellow 6 



6. Diagonal marks on pronotum meeting at posterior 

 margin to form a V-mark Phryganeid Genua A 



— Diagonal marks on pronotum not reaching posterior 

 margin but joining each other on meson to form an 

 arcuate mark Ptilostomis Kolenati 1859 



Genus Agrypnia Curtis 1835 



Nine species are known from the Nearctic region but 

 only a single species, A. glacialis Hagen 1864 (fig. 

 10:26A;) (Shasta County), has been reported from 

 California. 



Genus Phryganea Linneaus 1758 

 Three species of this genus are known from the 



Nearctic region and a single species, P. californica 

 Banks 1907, is known from California. This species 

 was described from a single female labeled "Cali- 

 fornia," and the species remains unidentifiable. 



Genus Banksiola Martynov 1924 



Eight species have been placed in this genus and 

 only a single species, B. crotchi Banks 1943 (fig. 

 10:27e) (Lassen County), has been recorded from 

 California. 



Family LlMNEPHIL IDA E 



This family probably contains more species than 

 any other in the Nearctic region. There are about 

 forty-five genera and two hundred and fifty species. 

 At present only sixteen genera and thirty-eight species 

 are known from California. All the larvae build cases 

 (fig. 10:2c, g) and are found in a variety of habitats, 

 ranging from temporary spring ponds to clear, cold, 

 swiftly flowing mountain streams. The larvae which 

 build the so-called "log-cabin type" cases belong to 

 this family. Adult males may be distinguished by the 

 maxillary palpi which are never more than three- 



