! Fig. 10:25. Distinguishing structures of Trichoptera. a, Oxye- 

 i'iSiro pallida, aedeagus; b, Leucotrichia pictipes, male genitalia, 

 sterol; c, Ochrotrichia mono, male genitalia, lateral; c„ tenth 

 ^rgite; d, Ochrotrichia lometa, male genitalia, lateral; d u tenth 

 jrgite; e, Ochrotrichia trapoiza, male genitalia, lateral; f, Hydro- 

 tila acorna, male genitalia, lateral; f u aedeagus; g, Chyranda 

 entralis, head of male; h, Agraylea saltesea, male genitalia, 

 literal; h u ventral view; h 2 , style of seventh sternite; h s , aede- 

 gus; i, Hydroptila rono, male genitalia, lateral; i x , aedeagus; /, 

 hydroptila xera, male genitalia, lateral; j u aedeagus; / 2 , tenth 

 srgite; j i , claspers, ventral; k, Hydroptila argosa, male genitalia, 

 iteral; k u aedeagus; kj, claspers, ventral; fe } , eighth tergite of 



255 

 Denning: Trichoptera 



11. Metanotum with a distinct, widened ventrolateral area 



(fig. 10:240, case as in fig. 10:2i 



Ochrotrichia Mosely 1934 



— Metanotum without a widened, lateral area (fir;. 10:24t») 

 Hydroptila Dalman 1819 



Genus Oxyethira Eaton 1873 



Although about twenty-four Nearctic species occur 

 in this genus, only one, 0. pallida (Banks) 1904 

 (fig. 10:25a) (Riverside County), is known to occur 

 in California. It is certain that additional species 

 will be collected in the state. 



Genus Leucotrichia Mosely 1934 



Four species have been assigned to this genus. 

 One species, L. pictipes (Banks) 1911 (fig. 10:256), 

 is transcontinental in distribution and is recorded 

 from California (Placer and Tulare counties). The 

 other three species occur in the Rocky Mountain 

 region and Texas. 



Genus Ochrotrichia Mosely 1934 



Of the twenty-two species in this genus, only three 

 have been collected in California. Generally the 

 species are found in clear, cold, rapidly flowing 

 streams. They may be identified by reference to 

 figures of the male genitalia. 



lometa (Ross) 1941 (fig. 10:25<f) 

 mono (Ross) 1941 (fig. 10:25c) 

 trapoiza Ross 1947 (fig. 10:25<?) 



Mono County 

 Mono County 

 Mono County 



Genus Agraylea Curtis 1834 



Three Nearctic species belong to the genus. In the 

 Midwest and certain of the Mountain States members 

 of this genus are often abundant along lakes or other 

 permanent bodies of water. The only species known 

 from California is A. saltesea Ross 1938 (fig. 10:25A) 

 (Tuolumne and Madera counties). 



Denning (1937) has described the egg-laying habits 

 of a closely related species, A. multinunctata. One 

 female is recorded as remaining submerged for one 

 hour and eight minutes. 



Genus Hydroptila Dalman 1819 



This is the largest genus in the family, containing 

 about fifty species. Four species have thus far been 

 collected in California. Since the genus is so abun- 

 dant and widespread it is probable that many more 

 species will eventually be collected in the state. 



female; k 4 , eighth sternite of female (a,b,g, Ross, 1944; c,d,i, 

 Ross, 1941; e, Ross, 1947; f, Denning, 1947a; h,,,k, Ross, 1938). 



