250 



Denning: Trichoptera 



Fig. 10:19. Male genitalia of Tinodes. a, provo, lateral; o lt 

 ventral view; b, parvula, lateral; b w sheaths, dorsal; c, sigodana, 

 lateral; c„ claspers, ventral (a,c, Ross and Merkley, 1950; b. 

 Denning 1950b). 



Genus Psychomyia Pictet 1834 



The genus contains only three North American spe- 

 cies. One species, P. nomada (Ross), is eastern and 

 one species, P. lumina (Ross) (fig. 10:18), is known 

 only from Oregon but probably will be found in Cali- 

 fornia. The only species known from California is 

 P. jlavida Hagen 1861 (fig. 10:17c) (Siskiyou and 

 Shasta counties). Because of the small size of the 

 adults, Psychomyia are frequently confused with the 

 Hydroptilidae. 



Genus Tinodes Stephens 1829 



All six of the Nearctic species occur only in the 

 western states. Thus far, five of the six species 

 have been taken in California. None of the larvae 

 has been described. Adults of this typically western 

 genus are frequently found along warm, slowly flowing 

 streams and are often found in abundance. 



Key to the Adult Males 



1. Apical segment of the clasper pointed and oblique at 

 apex with a dorsal spur near apex (fig. 10:19c); Los 

 Angeles County . sigodana Ross 1950 



— Apical segment of clasper rounded or truncate at apex 



2 



2. Apical segment of clasper rounded 3 



— Apical segment of clasper truncate (fig. 10:196); 

 •southern California parvula Denning I960 



3. Apical segment of clasper elongate, sinuous, as long 

 or longer than basal segment (fig. 10:17d); Shasta 

 County to Sonoma County belisa Denning 1950 



— Apical segment not any longer than basal segment, 

 somewhat sausage-shaped 4 



4. Mesal process of basal segment of clasper short and 

 wide from lateral aspect (fig. 10:19a); widespread 



provo Ross & Merkley 1950 



— Mesal process of basal segment long and narrow 

 (fig 10:17c); widespread . . . .consueta McLachlan 1871 



Family HYDROPSYCHIDAE 





This is world-wide in distribution and is one of the 

 larger families in the order. There are eleven Nearctic 

 genera containing about one hundred and fourteen 

 described species. The known California fauna con- 

 sists of seven genera and twenty-one species. Most of 

 the species are found along streams, and some mem- 

 bers of the two dominant genera, Hydropsy che and 

 Cheumatopsyche, become very abundant. 



The larvae are very active and possess a bushy gill 

 along each abdominal segment. They prefer fast- 

 flowing streams where they build a net under or on 

 logs, stones, or other submerged objects. Near these 

 nets the larvae spin ovoid cocoons for pupation. 



Key to the Genera 8 

 Adults 



1. Head with anterior warts large; posterior warts much 

 smaller Macronemum Burmeister 1839 



— Head with anterior warts small or indistinct; posterior 

 warts large 2 



2. Front wings with R 4 and R 5 very close together at 

 base, forming a long, narrow V 



Smicridea McLachlan 1871 



— Front wings with R 4 and R 5 widely divergent at base, 

 not running close together 3 



3. Hind wing with Sc and B.^ bowed deeply at apex .... 4 



— Hind wing with Sc and Ri not bowed, or both wings 

 with apical margin incised 5 



4. Hind wing with apex round, Sc and Rj bowed deeply 

 at apex Diplectrona Westwood 1840 



— Hind wing with Sc joining R, at base of stigmal re- 

 gion, then separating and diverging again 



Homoplectra Ross 1938 



5. Second segment of maxillary palpi distinctly shorter 

 than 3rd 6 



— Second segment of maxillary palpi as long as or longer 

 than 3rd 7 



6. Eighth sternite forming a short wide projection extend- 

 ing under the genital capsule, 5th segment of maxillary 

 palpi longer than the other 4 



Parapsyche Betten 1934 



— Eighth sternite not projecting under genital capsule, 

 5th segment of maxillary palpi shorter than other 4 



Arctopsyche McLachlan 1868 



7. Front tibiae without apical spurs 



Potamyia Banks 1 900 



— Front tibiae with well-developed apical spurs 8 



'Adapted from Ross (1944). 



