267 

 Denning: Trichoptera 



Fig. 10:34. Genitalia and other structures of male Trichoptera. o, Seri'cosfoma gr/seo/um, 

 genitalia, lateral; a„ clasper, dorsal; a 2l ventral plate, ventral view; b, Mystacides sepulchral/ s, 

 genitalia, lateral; b lt ninth sternite; c, Mystacides longicornis, ninth sternite; d, Oecetes avara, 

 genitalia, lateral; e, Lepidostoma liba, head; f, Theliopsyche sp., head; g, Helicopsyche borealis, 

 genitalia, lateral; h, Lepidostoma errigena, genitalia, lateral; h u clasper, ventral; i, Lep/c/osroma 

 mira, genitalia, lateral; i„ tenth tergite, dorsal; i" a , first antennal segment (o, Kimmins and 

 Denning, 1951; b-g, Ross, 1944; h,i, Denning, 1954b). 



Keys to Genera 19 



Adulti 



1. Head with posterior warts fairly wide, triangular or 



curved (fig. 10:34e) Lepidostoma Rambur 1842 



— Head with posterior warts long, narrow, and straight 

 (fig. 10:34/) Theliopsyche Banks 1911 



Genus Lepidostoma Rambur 1842 



Of the forty-five known Nearctic species only twelve 

 have been recorded from California. Although the 

 larvae superficially resemble some of the Limnephili- 

 dae they may be readily separated by the absence of 

 1 the dorsal spacing hump (fig. 10:6), and by the prox- 

 imity of the antennae to the eye (fig. 10:5k). An 

 example of the larval case is shown in figure 10:2k. 



"Adapted from Ross (1944). 



Key to Adult Moles 20 



1. Front wing with entire costal cell reflexed, turned 

 back as a flap at least over subcostal cell 2 



— Front wing with at most only a small basal portion 

 of the costal cell reflexed 4 



2. Tenth tergite having ventrolateral portion forming a 

 broad, flat divergent flange (fig. 10:33e); Santa Cruz 

 County lotor Ross 1946 



— Tenth tergite with only a short sharp spur projecting 

 from the ventrolateral portion 3 



3. Tenth tergite with a large prominent dorsal lobe (fig. 

 10:34 A); San Bernardino, Los Angeles, and San Diego 

 counties errigena Denning 1 954 



— Tenth tergite with at most only a short, sharp spur 

 dorsally (fig. 10:33^); Mono, Sierra, and Placer counties 



rayneri Ross 1941 



4. Base of 10th tergite with a pair of heavy ventral spurs, 

 laterad in position; clasper with only a dorsal finger- 

 like process near base (fig. 10:33a); Monterey, Contra 

 Costa, Los Angeles counties cantha Ross 1941 



'Adapted from Ross (1946). 



