254 



Denning: Trichoptera 



fT\ FY\ 



Fig. 10:24. Adult and larval structures of Hydroptilidae. a, 

 Orthofrichia americana, thorax; b, Hydroptila hamata, thorax; c, 

 Stactobiella brustia, thorax; d, Metrichia nigritta, thorax; e, Leu- 

 cotrichia pictipes, thorax; f, Ochrotrichia farsalis, thorax; g, 

 Agraylea multipunctata; h, Oxyethira pallida, thorax; i, Ithytrichia 

 clavata, thorax; /, Leucotri'chi'a pictipes, front coxae; k, Metrichia 

 nigritta, front coxae; /, Ochrotrichia tarsalis, larval metanotum; 

 m, Hydroptila waubesiana, larval metanotum (Ross, 1944). 



— Front tibiae without apical spur 3 



3. Metascutellum almost rectangular (fig. 10:24a) .... 



Orthotrichia Eaton 1873 



— Metascutellum pentagonal to triangular (fig. 10:246) 



Hydroptila Dalman 1819 



4. Metascutellum wide, short, and rectangular (fig. 10:24c) 



Stactobiella Martynov 1924 



— Metascutellum either triangular (fig. 10:24c?) or narrower 

 than scutum (fig. 10:24^) 5 



5. Front tibiae with an apical spur 6 



— Front tibiae without an apical spur 7 



6. Front coxae wide (fig. 10:24/) 



Leucotrichia Mosely 1934 



— Front coxae narrow (fig. 10:24&). . .Metrichia Ross 1939 



7. Hind tibiae with 1 preapical spur 



Neotrichia Morton 1905 



— Hind tibiae with 2 preapical spurs 8 



8. Middle tibiae without a preapical spur 



Mayatrichia Mosely 1937 



— Middle tibiae with a preapical spur 9 



9. Mesoscutellum with a linelike fracture dividing the 

 sclerite almost equally (fig. 10:24/) 



Ochrotrichia Mosely 1934 



— Mesoscutellum without such a transverse groove .... 10 



10. Mesoscutellum narrow and diamond-shaped, postero- 

 dorsal edge widely separated from posterior margin 

 (fig. 10:24c') Agraylea Curtis 1 834 



— Mesoscutellum wider, posterodorsal edge close to or 

 touching posterior margin 11 



11. Posterodorsal edge of mesoscutellum touching posterior 

 margin on meson (fig. 10:24A) . . . Oxyethira Eaton 1873 



— Posterodorsal edge of mesoscutellum separated from 

 posterior margin by a narrow strip (fig. 10:24t) 



Ithytrichia Eaton 1873 



Known Larvae 11 



1. Abdomen enlarged, at least some part of it much 

 thicker than thorax (fig. 10:3a); living in case (later 

 instars) 2 



— Abdomen slender, not appreciably thicker than thorax; 

 free living, not with case (early instars) not keyed 



2. Each segment of abdomen with a dark, sclerotized 

 dorsal area 3 



— Abdomen with at least segments 2-7 without dark, 

 sclerotized dorsal area, at most with a small, delicate 

 ring 4 



3. Aodomen with dorsal sclerites solid; segments 1 and 2 

 small, 3-6 greatly expanded. Case translucent, ovoid 

 (fig. 10:36) Leucotrichia Mosely 1934 



— Abdomen with dorsal sclerites membranous across 

 middle; segments 1-6 evenly expanded 



Ochrotrichia Mosely 1934 



4. Abdominal segments with lateral projections 



Ithytrichia Eaton 1873 



— Abdominal segments without lateral projections 5 



5. Middle and hind legs almost 3 times as long as the 

 front legs Oxyethira Eaton 1873 



— Middle and hind legs not more than 1M> times as long 

 as front legs 6 



6. Middle and hind legs with very long, slender tarsal 

 claws which are much longer than tarsi; case purselike 



Agraylea Curtis 1834 



— Middle and hind legs with tarsal claws shorter or 

 stouter; cases of various types 7 



7. Anal legs distinctly projecting from body mass; 8th 

 abdominal tergite with a brush of setae 8 



— Anal legs apparently combined with body mass and 

 only the claws projecting; 8th abdominal tergite with 

 only 1 or 2 pairs of weak setae 9 



8. Thoracic tergites clothed with long, slender, erect, 

 inconspicuous setae; case of sand grains, evenly 

 tapered, and without posterior slit 



Neotrichia Morton 1905 



— Thoracic tergites clothed with shorter, stout, black 

 setae which are conspicuous and appressed to the 

 surface of the body; case translucent, evenly tapered, 

 and with dorsal side either ringed or fluted with raised 

 ridges Mayatrichia Mosely 1937 



9. Tarsal claws with long, stout inner tooth; case purse- 

 like, robust Stactobiella Martynov 1924 



— Tarsal claws without prominent inner tooth; case 

 either purselike or cylindrical 10 



10. Middle and hind legs with tibiae cylindrical and long; 

 case long, smooth and round in cross section, tapered 

 at each end and with an indented slit at both ends 

 Orthotrichia Eaton 1873 



— Middle and hind legs with tibiae stout and widened at 

 apex; case of purse type 11 



'Adapted from Ross (1944). 



