28 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



88 89 



87 ., 90 



Adult Pro- and Mesonota 

 Fig. %Q.-^-Hydropsyche simulans. Fig. 85. — Helicopsyche borealis. 



Fig. 81. — Psychomyia flavida. Fig. 86. — Psilotreta frontalis. 



Fig. 82. — Athripsodes tarsi-punctatus. Fig. 87. — Ganonema americanum. 



Fig. 83. — Beraea gorteba. Fig. 88. — Sericostoma crassicornis. 



Fig. 84. — Brachycentrus numerosus. Fig. 89. — Goera calcarata. 



Fig. 90. — Theliopsyche sp. 



more than one and one-third times 



as long as fourth, fig. 62 6 



fej" Maxillary palpi with second segment 

 short, subequal to first, fig. 62; 

 labrum evenly rounded and fairly 



wide, fig. 67 



Rhyacophilidae, p. 30 



Maxillary palpi with second segment 

 much longer than first, figs. 63—65; 

 labrum with a wide basal portion 

 set off by a crease from a long, 

 tonguelike apex, fig. 68 7 



7. Anterior tibiae with 2 or more spurs; 



middle tibiae with 4 spurs 



Phryganeidae, p. 161 



Anterior tibiae with at most 1 spur; 

 middle tibiae with 2 or 3 spurs. . . . 

 Limnephilidae, p. 176 



8. Maxillary palpi with 5 or more seg- 



ments, figs. 59, 60 9 



Maxillary palpi with less than 5 seg- 

 ments, figs. 64-66 12 



9. Terminal segment of maxillary palpi 



much longer than preceding and 

 with close, suture-like, cross striae, 

 which are not possessed by the other 



segments, figs. 214, 321 10 



Terminal segment of maxillary palpi 

 without such striae and similar in 

 general structure to fourth segment. 



