178 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



Dorsal gills of first few abdominal seg- 

 ments with 2 or 3 branches at the 

 most, not spreading fanlike, fig. 614 9 



8. Dorsal gills at base of abdomen with 



about 12 branches each, fig. 616. . . 



Caborius, p. 196 



Dorsal gills at base of abdomen with 

 about 6 branches each, fig. 615. . . . 

 Hesperophylax, p. 183 



9. Head with a narrow, dark line along 



meson of frons and with a dark, U- 

 shaped line running through eyes 



and above frons, fig. 617 



Glyphotaelius, p. 183 



Head either with wider dark areas, fig. 

 648, or without indication of dark 

 lines, fig. 646 10 



10. Prosternal horn short, not projecting 



beyond apexes of front coxae 



Limnephilus, p. 185 



Prosternal horn projecting distinctly 



beyond apexes of front coxae 



Platycentropus, p. 181 



Pupae 



1. Dorsal plates 5P transverse, narrow 



and with two rows of about 24 teeth 



each, fig. 618 Neophylax, p. 202 



Dorsal plates 5P much more ovate or 

 nearer square, fig. 620, with rows of 

 not more than 12 teeth each, fig. 619 2 



2. Dorsal abdominal gills arising in 



groups of 5 or 6 or threadlike, usu- 

 ally crushed into a small, shapeless 



bundle Hesperophylax, 



p. 183; probably Caborius also, p. 196 

 Dorsal abdominal gills finger-like and 

 distinct, figs. 622, 623, never with 

 more than 3 or 4 gills in a group. . . 3 



3. Dorsal abdominal gills stout, very long, 



and arising singly 4 



Dorsal abdominal gills more slender, 

 arising in bunches of two or more. . 5 



4. Dorsal plates 5P, 6 and 7 with about 



17, 5 and 4 teeth, respectively, fig. 



619 Astenophylax, p. 183 



Dorsal plates 5P, 6 and 7 with about 

 7 and 2 teeth and 1 tooth, respec- 

 tively, fig. 621. . . . Pycnopsyche, p. 193 



5. Second antennal segment with a tuft 



of long, black hair, fig. 624 



Dicosmoecus, p. 181 



Second antennal segment with at most 

 a tuft of very short setae, fig. 625. . 6 



6. Postero-dorsal gills of second abdomi- 



nal segment and antero-dorsal gills 

 of third segment with some filaments 

 reaching fifth segment and a few 



others nearly as long, fig. 622 



Platycentropus, p. 181 



Postero-dorsal gills of second abdomi- 

 nal segment and antero-dorsal gills 

 of third never reaching more than a 

 short distance on fourth segment, 



fig. 623 Limnephilus, p. 185; 



Glyphopsyche, p. 200; Frenesia, p. 199 



620 



Fig. 618. — Neophylax autumnus pupa, hook- Fig. 622. — Platycentropus radiatus pupa, 



bearing plates. portion of abdomen. 



Fig. bl9.~Jstenophylax argus pupa, hook- Fig. 623.— Glyphopsyche missouri pupa, 



bearing plates. portion of abdomen. 



Fig. 620. — Limnephilus submonilifer pupa, Fig. 624. — Dicosmoecus sp. pupa, base of 



hook-bearing plates. antenna. 



Fig. b2\.~Pycnopsyche subfasciata pupa. Fig. 625.— Platycentropus radiatus pupa, 



hook-bearing plates. base of antenna. 



