— Apicoventral corner of cerci not so produced (fig. 



10:276); San Bernardino County 



occidentalis (3anks) 1908 



Genus Drusinus Betten 1934 



Except for a doubtful species known only from a 

 female collected in British Columbia, D. edwardsi 

 (Banks) 1920 (fig. 10:30a) (Shasta to Marin counties) 

 is the only western species. The three other species 

 are eastern in distribution. The immature stages have 

 not been described. 



The status of the name Drusinus is in doubt. Schmid 

 (1955) considers Drusinus a synonym of P seudosteno- 

 phylax Martynov 1909. 



Genus Limnephilus Leach 1815 



Approximately ninety species have been described in 

 this dominant genus of the family. Only thirteen spe- 

 cies are recorded from California; doubtless many more 

 remain to be collected. Members of the genus occur 

 along streams, lakes, or ponds. There is still a differ- 

 ence of opinion regarding the limits of Limnephilus, 

 and in the past a wide variety of species have been 

 referred to the genus. Even today a precise definition 

 of the genus is difficult. The larvae (fig. 10:6) of only 

 a few species have been described. 



Key to Adult Moles 14 



1. Front basitarsus as long or longer than next segment 



2 



— Front basitarsus not more than 1/2 length of succeeding 

 segment 9 



2. Front basitarsus subequal in length to 2nd segment 



3 



— Front basitarsus usually V/ 2 times longer than 2nd 

 segment 5 



3. Tenth tergite produced into a sharp recurved tip (fig. 

 10:28A); Marin County lunonus Ross 1941 



— Tenth tergite low and without a sharp tip 4 



4. Clasper triangular, large, and broad (fig. 10:28c); 

 Inyo County acnestus Ross 1 938 



— Clasper straight, fir.gerlike, not particularly large 

 (fig. 10:28Z); Inyo County productus 3anks 1914 



5. Lateral appendages of aedeagus rodlike, crossed over 

 aedeagus (fig. 10:28/); Mono and Tuolumne counties 



coloradensis (Banks) 1899 



— Lateral appendages of aedeagus absent, or if present 

 not crossed over aedeagus 6 



6. Tenth tergite knobbed and large, much larger than 

 cerci which are slender and elongate (fig. 10:28i); 

 Placer County morrisoni 3anks 1920 



— Tenth tergite smaller, or with apex small 7 



7. Tenth tergite slender, long, arched in middle higher 

 than cercus; 8th tergite without apical patch of black 

 setae (fig. 19:28c); Marin County .... nogus Ross 1944 



— Tenth tergite not arched higher than cercus; 8th tergite 

 with a patch of short black or yellow setae 8 



8. Posterior edge of cerci flattened and flangelike; 

 clasper with sharp apical point (fig. 10:28e); Modoc 

 County externus Ilagen 1861 



— Posterior edge of cerci sharp or rounded in cross 

 section, not flanged; clasper without sharp, acute 



261 



Denning: Tricnoptera 



point (fig. 10:28*); Lassen County 



occidentalis Banks 1906 



9. Clasper formed as a narrow sclerite ext 



margin of 9th segment (fig. 10:28"i); Modoo, Placet 

 counties aeoludens Bank 1914 



— Clasper formed as a triangular or thumblike process . 10 



10. Eighth tergite with a mesoapical patch of short dork 

 setae 11 



— Eighth tergite simple, lateral arms of aedeagus with 

 basal half much thicker than remainder (fig. 10:286); 

 Inyo County assimilis Banks 1908 



11. Clasper longer than deep, lobes of 10th tergite with 

 long dorsal process, lateral arms of aedeagus filiform 

 (fig. 10:28;'); Mono County spinatus Banks 1914 



— Clasper shorter than deep, lobes of 10th tergite not 

 produced into a long dorsal process 12 



12. Cerci triangular, small and scarcely surpassing 

 clasper in lateral area (fig. 10:28a"); Stinislaus, 

 Tuolumne, Sacramento counties .... frijole Ross 1911 



— Cerci more or less rhomooidal, much larger than 

 clasper (fig. 10:28a); Tehama and Fresno counties 



aretto Ross 1938 



Genus Lenarchus Martynov 1914 



Eleven species have been assigned to the genus, but 

 only two have been definitely recorded from Cali- 

 fornia. The genus is closely related to the preceding 

 one and may be separated from it mainly on genitalic 

 differences. 



gravidus (Hagen) 1861 (fig. 10:29a) 

 villus (Milne) 1935 (fig. 10:296) 



Madera, Tuolumne, 



Mariposa 



Mariposa, Sierra 



Genus Psychoglypha Ross 1944 



The seven species are western or subarctic except 

 alascensis Banks, which is also recorded from Michi- 

 gan. At present three species are known to occur in 

 California. Front wings are characteristically colored, 

 the stigma is distinct and usually red, and a silvery 

 streak runs through the center. Both wings are long 

 and narrow (fig. 10:266). 



avigo (Ross) 1941 (figs. 10:266, 



10:29c) 

 bella (Banks) 1903 (fig. 10:29c) 



ormiae (Ross) 1938 (fig. 10:29/) 



Plumas Count} 



Placer, Marin, 



Santa Cruz 



Placer, Marin 



Adapted from Ross and Merkley (1952). 



Genus Glyphopsyche Banks 1904 



Only two species have been referred to this genus, 

 one in the Midwest and the other in the West and 

 the Arctic. The single species known from California 

 is G. irrorata (Fabricius) 1781 (fig. 10:29e) (Marin 

 County). 



Genus Oligophlebodes Ulmer 1905 



All five Nearctic species are western in distribution. 

 As yet, only one species, 0. sierra Ross 1944 (fig. 



