265 

 Denning: Trichoptera 



Fig. 10:32. Male genitalia, a, Athripsodes annul icornis, lateral; a,, clasper, caudal view; b, 

 Trianodes frontalis, clasper, lateral; c, Athripsodes transversus, lateral; d, Athripsodes tarsi- 

 punctatus, lateral; d lt clasper, caudal view; e, Oecetis ochracea, lateral; e lf claspers, ventral; 

 f, Oecetis inconspicua, lateral; f„ claspers, ventral; g, Mystacides alafimbriata, ventral (o-f, 

 Ross, 1944; g. Ling, 1938, unpublished fig.). 



- Mesonotum without such a pair of sclerotized bars . . 5 



5. Anal segment developed into a pair of sclerotized, 

 concave plates, with spinose dorsolateral and mesal 

 carinas, and an overhanging ventral flap 



Setodes Rambur 1842 



- Anal segment convex and without carinae between 

 anal hooks 6 



6. Hind tibia entirely sclerotized, without a fracture 



in middle; abdomen without gills 



Leptocella Banks 1899 



- Hind tibia with a fracture near middle which appears 

 to divide tibia into 2 segments; abdomen with at least 

 a few gills 7 



7. Hind tibia with a regular fringe of long hair 



Triaenodea McLachlan 1865 



- Hind tibia with only irregularly placed hairs 



Mystacides Berthold 1827 



Key to Adult Males 



1. Apical process of 9th sternite forked (fig. 10:346) 



2 



— Apical process of 9th sternite not forked (fig. 10:34c) 

 simple and wide; eastern half of U.S 



longicornis (Linneaus) 1758 



2. Forked apical process of 9th sternite with arms long 

 and slender, only slightly divergent (fig. 10:346), 

 Nevada County sepulchralis ( Walker) 1852 



— Forked process of 9th sternite with arms widely 

 divergent (fig. 10:32o); northern California and Fresno 

 County alafimbriata Griffin 1912 



Genus Oecetis McLachlan 1877 



Genus Athripsodes Billberg 1820 



Although there are about thirty species in the genus, 

 only three are known to occur in the state. Several 

 times that number will be eventually collected. 



annulic ornis (Stephens) 1836 Placer County 



(fig. 10:32a) 



tarsipunctatus (Vorhies) 1909 (fig. 10:32a") Stanislaus 



transversus (Hagen) 1861 (fig. 10:32c) Lake County 



Genus Mystacides Berthold 1827 



This is a small genus with only three Nearctic spe- 

 cies. Members of the genus may occur in abundance, 

 especially along the shores of some lakes. Larval 

 and pupal cases are cylindrical, slightly tapering, 

 and composed of small grains of sand (fig. 10:2c?). 



Only three of the eighteen Nearctic species have 

 thus far been recorded from California. Some of the 

 most widely distributed and most abundant caddis- 

 flies, such as 0. inconspicua (Walker), belong to this 

 genus. 



disjuncta (Banks) 1920. Northern California, 



Fresno County 



This species may be a color variant of avara (Banks); 



the genitalia are very similar, that for avara as in fig. 



10:34a 1 . 

 inconspicua (Walker) 1852 Widespread in California 



(fig. 10:32/) 

 ochracea (Curtis) 1825 (fig. 10:32e) Shasta County 



Genus Triaenodes McLachlan 1865 



Only one of the nineteen described Nearctic species 

 is known to occur in California, and that species, 

 T. frontalis Banks 1907 (fig. 10:326) (Ventura, Mono, 



