August, 1944 



Ross: Caddis Flies of Illinois 



179 



Adults 



1. Front wings with apical abscissa of 



vein 2A atrophied, fig. 626 



Platycentropus, p. 181 



Front wings with vein 2/i complete, 

 fig. 628 2 



2. Front wings with Sc ending in a short, 



straight, oblique crossvein, fig. 627 



Radema, p. 181 



Front wings with Sc not ending in an 

 oblique crossvein, figs. 628, 629. . . 3 



3. Hind wings with M1+2 undivided, fig. 



637; head with a small pair ot warts 

 between lateral ocelli and posterior 



warts Neophylax, p. 202 



Hind wings with Mi-f2 divided into Mi 

 and M2, fig. 638; head without warts 

 between lateral ocelli and posterior 

 warts 4 



4. Apex ot front wings scalloped and 



posterior corner sharp, fig. 628. . . . 

 Glyphotaelius, p. 183 



626 



629 



630 



Limnephilidae Front Wings 



Fig. 626. — Platycentropus radiatus. 

 Fig. 627. — Radema stigmatella. 

 Fig. 628. — Glyphotaelius hostilis. 

 Fig. 629. — Phanocelia canadensis. 

 Fig. 630. — Chilostigma areolatum. 



184 



Fig. 631. — Limnephilidae front wings. A, 

 Glyphopsyche missouri; B, Glyphopsyche irro- 

 rata; C, Grensia praeteritum\ D, Frenesia miss a. 



Apex of front wings either evenly 

 rounded or incised without scalloped 

 condition, figs. 629, 6315 5 



5. Dorsum of head and pronotum greatly 



lengthened, with a deep, narrow 

 groove running their entire length, 



fig. 644 Leptophylax, p. 



Dorsum of either head or pronotum, 

 or both, much shorter, and head 

 without mesal groove 



6. Front wings with fork of Mi-|-2 con- 



siderably beyond crossvein r-m, fig. 



629 Phanocelia, p. 



Front wings with fork of M1-1-2 at or 

 near crossvein r-m, fig. 630 



7. Dorsum of head bright yellow, highly 



polished and with only a few short, 



black setae Astenophylax, p. 183 



Dorsum of head either dark, dull or 

 with long or abundant setae 



8. Vertex and anal portion of front wings 



covered with close, appressed, silky 



hair Hesperophylax, p. 



Vertex without close, appressed hair 



9. Front wings with a short, rounded 



stigma (bordered below by Ri) and 

 with R2 also curved parallel with it 

 or even more curved, figs. 630, 631; 

 never with a longitudinal silvery 



line 



Front wings either with a longitudinal 

 silvery line, fig. 633, or with stigma 



201 



7 



8 



183 

 9 



10 



