264 



Denning: Trichoptera 





Fig. 10:31. Structures of adult Trichoptera. a, Heferop/ecfron ca/iforn/cum, wings of male; a w 

 male genitalia, lateral; a 2 , male genitalia, dorsal; a 1 , ventral; b, Parthina linea, forewing; b„ 

 male genitalia, dorsal; t> 2 , female genitalia, lateral; b,, female genitalia, dorsal; c, Hydatophylax 

 hesperus, male genitalia, lateral; c lf tenth tergite, dorsal; d, Triaenodes injusia, wing; e. Oecefis 

 inconsp/cua, wing; f, Athripsodes tarsi-punctatus, head (o, Kimmins and Denning, 1951; b. Den- 

 ning 1954a, c, Schmid, 1950b; d-f, Ross, 1944). 



Family LEPTOCERIDAE 



Four of the seven genera of Leptoceridae and nine 

 species are known to occur in the state. The larvae 

 are found in lakes, ponds, or streams and all build 

 cases (fig. 10:3c,d). Some members of the family are 

 widely distributed and occur in abundance. The adults 

 are slender and possess long, slender antennae. 



Key to the Genera 

 Adults 17 



1. Front wing with stem of media atrophied (fig. 10:31<i) 



Triaenodes McLachlan 1865 



— Front wing with stem of media present 2 



2. Media apparently not branched (fig. 10:3 le) 



Oecetis McLachlan 1877 



— Media obviously branched 3 



3. Head with epicranial stem distinct, lateral sutures 

 absent or indistinct 4 



— Head with epicranial stem absent or indistinct, lateral 

 sutures distinct (fig. 10:31/) 5 



4. Color yellowish to light brown . . . Setodes Rambur 1842 



— Color dark brown to bluish-black 



Mystacides Berthold 1827 



"Adapted from Ross (1944). 



5. Color whitish, most ofRsof hind wings and its branches 

 atrophied Leptocella Banks 1899 



— Color brownish, Rs and its branches in hind wing 

 present 6 



6. Front tibiae with 2 apical spurs 



Athripsodes Billberg 1820 



— Front tibiae with no apical spurs 



Leptocerus Leach 1815 



Larvae" 





1. Middle legs with claw stout and hook-shaped, tarsus 

 bent; case transparent Leptocerus Leach 1815 



— Middle legs with claw slender, slightly curved, tarsus 

 straight; case seldom transparent ' 2 



2. Maxillary palpi nearly as long as stipes; mandibles 

 long, sharp at apex, the teeth considerably below apex 



Oecetis McLachlan 1877 



— Maxillary palpi short, about '/£ length of stipes; man- 

 dibles shorter, blunt at apex, the teeth near or at apex 



3 



3. Head with a suturelike line paralleling the epicranial 

 arms (fig. 10:5t) Athripsodes Billberg 1820 



— Head without a suturelike line in addition to the epi- 

 cranial arms 4 



4. Mesonotum membranous with a pair of sclerotized, 

 narrow, curved, or angled bars (fig. 10:5t) 



Athripsodes Billberg 1820 



'From Ross (1944). 



