266 



Denning: Trichoptera 



Fig. 10:33. Genitalia and other structures of male Lepidostoma. a, cantha, lateral; o„ tenth 

 tergite, dorsal; b, cascadensis, lateral; c, jewetti, lateral; d, podager, lateral; c/,, dorsal view; 

 d 3 , maxillary palpus; d it labial palpus; d 4 , fore tibia and tarsus; e, lotor, clasper, ventral; e lr 

 tenth tergite, dorsal; e a , ninth and tenth tergite, lateral; f, strophis, tenth tergite, dorsal; f Xl 

 genitalia, lateral; g, rayneri, genitalia, lateral; g lf dorsal view; h, un/co/or, genitalia, lateral; 

 i, roafi, genitalia, lateral (a,g, Ross, 1941; b,f, Ross, 1938; c,h, Ross, 1946; d-d s , Kimmins; 

 and Denning, 1951; d 4 , e,f,h,i, Ross, 1946). 



and Monterey counties), is widely distributed in the 

 West. Most of the larvae build cases in a spiral pattern 

 (fig. 10:3d). 



Family LEPIDOSTOMATIDAE 



Two genera and forty-nine species are recognized. 

 One genus, Lepidostoma, is widespread in the United 

 States and Canada and contains forty-five species; 

 Theliopsyche is apparently restricted to the eastern 

 states and contains four species. One genus and 



twelve species are recorded from California. 



Sexual dimorphism has been developed to such an 

 extent in the genus Lepidostoma that a large number 

 of very unusual and bizarre characters are to be 

 found in the males. Some of the more unusual develop- 

 ments are seen in the maxillary palpi, the basal 

 segment of the antennae, and the legs and wings. 

 In some of the furrows and reflexed portions of the 

 wings, scales occur that are somewhat similar to 

 those of the Lepidoptera. This group has exceeded 

 all others in the Trichoptera in development of sec- 

 ondary sexual characters. 



