Fig. 10:14. Male genitalia of Agapeius. a, malleatus, lateral; 

 b, mar/o, lateral (Celeste Green, 1955). 



— Clasper, at most, directed only slightly dorsad 2 



2. Apex of clasper decidedly emarginate, forming a dis- 

 tinct projection 3 



— Apex of clasper with no projection 4 



3. Apical emargination of clasper forming a ventral, finger- 

 like projection (fig. 10:13A); southern California .... 



celatus McLachlan 1871 



— Apical emargination of clasper forming a long, curved, 

 acute dorsal projection (fig. 10:146); Santa Clara 

 County to Monterey County marlo Milne 1936 



4. Clasper longer than 10th tergite, gradually tapering 

 toward apex 5 



Fig. 10:15. Male genitalia, a, Agapetus taho, lateral; a 1# clasper, 

 ventral; b, A, orosus, lateral; b,, clasper, ventral; b 2 , mesal 

 process of sixth sternite; b 3 , tenth tergite, dorsal; c, Dolophilodes 

 dorcus, lateral; c lf tenth tergite, dorsal; d, D. ,novusamericanus, 

 lateral; d lt claspers, ventral; e, D. pallidipes, lateral; e w tenth 

 tergite, dorsal; f, D. aequa//s, tenth tergite, dorsal; g, Chimmara 

 si'vo, lateral; g lf tenth tergite, dorsal (a, Ross, 1947; b, Denning, 

 1950b; c, Ross, 1938a; d-g. Denning, 1949c). 



247 

 Denning: Trichoptero 



— Clasper only slightly longer than 10th tergite, apical 

 half widened, apex truncate, (fig. 10:14a); Mariposa 

 County to Los Angeles County. . .malleatus Banks 1911 



5. Clasper long, slender, mesally curved, dorsodistal 

 corner of 10th tergite bearing a pair of spines (fig. 

 10:156); Los Angeles County.... orosus Denniny 1950 



— Clasper wide throughout, apex of 10th tergite with a 

 long ventral projection (fig. 10:15a); Placer and Modoc 

 counties taho Ross 1 94 7 



Family PHILOPOTAMIDAE 



The Philopotamidae is a small family of world-wide 

 distribution. The thirty-two known Nearctic species 

 are arranged in five genera. Most of the known larvae 

 are found in rapid streams where they construct long, 

 narrow silken nets (fig. 10:2e). Pupation occurs in 

 cocoons of small stones and debris. The adults are 

 rather small, blackish, and secretive. Three of the 

 five genera are found in California and contain a total 

 of thirteen species. 



Key to Genero 4 

 Known Larvo* 



1. Apex of frons asymmetrical. . . .Chimarra Stephens 1829 



— Apex of frons only slightly or not at all asymmetrical 2 



2. Apex of frons slightly asymmetrical 



Dolophilodes Ulmer 1909 



— Apex of frons perfectly symmetrical 



Wormaldia McLachlan 1865 



Adults 



1. Wings reduced to stubs 



Dolophilodes Ulmer 1909 (some) 



- Wings normal, reaching beyond apex of abdomen .... 2 



2. Front tibiae with 1 apical spur or none, clasper 1- 

 segmented Chimarra Stephens 1829 



- Front tibiae with 2 apical spurs, clasper 2-segmented. 3 



3. Front wing with Sc 2 deeply bowed near apex, R! sin- 

 uate, the two nearly touching or touching 



Gatlinia Ross 1948 



- Front wing having Sc and R t nearly straight, not close 

 to each other 4 



4. Rj» 3 either not branched, or branching at or near radial 

 cross veins Wormaldia McLachlan 1865 



- R,« 3 branched near margin of wing 



Dolophilodes Ulmer 1909 



Genus Dolophilodes Ulmer 1909 



There are five species described from the Nearctic 

 region and four have been recorded from California. 

 The fifth species, D. distinctus (Walker), occurs in 

 the eastern half of the United States and is of interest 

 in that adults occur throughout the year and most of 

 the females are apterous. 



Key to Adult Males 

 1. Apical segment of clasper considerably narrowed, 



"Adapted from Ross (1944). 



