164 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



10-12 teeth forming two rows, fig. 

 575; apical projection of first tergite 

 bifid, figs. 572," 573 4 



4. Apical projection of first tergite only 



moderately produced, the apex 



wide, fig. 572 Ptilostomis, p. 171 



Apical projection of first tergite form- 

 ing a long structure with a narrow 

 apex, fig. 573 Eubasilissa, p. 168 



5. Mandibles greatly curved and sickle 



shaped, fig. 569; fourth tergite with 

 a normal sized, hook-bearing, scle- 

 rotized plate, fig. 576, which nearly 

 equals size of anterior plate on fifth 



tergite Phryganea, p. 174 



Mandibles only slightly curved, fig. 

 568; fourth tergite with hook-bear- 

 ing plate absent or not more than 

 half size of anterior plate on fifth 

 tergite, fig. 577 Agrypnia, p. 165 



Adults 



1. Maxillary palpi 4-segmented, fig. 64; 



genitalia with an aedeagus, figs. 580, 



594 (males) 2 



Maxillary palpi 5-segmented; genitalia 

 without an aedeagus, figs. 582, 598 

 (females) 8 



2. Ninth sternite produced as a toothed 



shelf beyond the bases of the clasp- 



ers, fig. 594 Ptilostomis, p. 171 



Ninth sternite not shelflike, figs. 580, 

 585 3 



3. Claspers produced posterad into a 



short, slightly upturned point, but 

 rounded and low dorsad, appearing 

 spoon shaped from the side and bis- 

 cuit shaped from below, figs. 603, 



604 Phryganea, p. 174 



Claspers produced dorsad into either 

 a long process or into appendage- 

 like blades, figs. 580, 585 4 



4. Tenth tergite forming two long, black, 



sclerotized rods, fig. 590; ninth ster- 

 nite with a pair of sharp points, fig. 

 590. Hind wings banded with black 



and dark yellow, fig. 588 



Eubasilissa, p. 168 



Tenth tergite not rodlike; ninth ster- 

 nite sometimes with 1 mesal point 

 but not 2. Hind wings not so 

 banded 5 



5. Hind wings almost entirely black, fig. 



587 Oligostomis, p. 167 



Hind wings with only black spots or 

 markings on a gray or clear ground 

 color 6 



6. Ninth tergite forming a transverse, 



somewhat hood-shaped area arising 

 above base of tenth tergite and 

 bearing a brush or pair of brushes of 



long setae, figs. 580, 581 



Agrypnia, p. 165 



Ninth tergite continuous with outline 

 of tenth tergite and usually not 

 bearing a brush of long setae 7 



7. Middle tibiae thorny, the black spines 

 sticking out prominently and about 

 as long as the tibia is thick; wings 

 shiny with a conspicuous pattern of 



black markings, fig. 591 



Banksiola, p. 169 



Fig, 578. — Banksiola selina, front wing. 

 Fig. 579. — Ptilostomis semijasciata, front 

 wing. 



Middle tibiae not appearing thorny, 

 the black spines not sticking out 

 prominently, shorter than the tibia 

 is thick; wings dull, tawny brown 

 and with only a faint, fine, irrorate 

 pattern Fabria, p. 166 



8. Ninth sternite divided at apex into 



three long processes, which are 

 stout and close together, figs. 589, 



605 9 



Ninth sternite either not divided into 

 three points or these very short, 

 figs. 586, 601 10 



9. Both wings checkered with black and 



orange, the hind wings black at base 

 with two bands at apex, fig. 588; 

 ninth sternite with apical processes 

 shorter and converging, fig. 589. . . 



Eubasilissa, p. 168 



Neither pair of wings with orange, the 

 hind wings pale at least at base; 

 ninth sternite with apical processes 



longer and divergent, fig. 605 



Phryganea, p. 174 



10. Ninth sternite forming an extremely 



wide, flat, emarginate plate, fig. 



584C Fabria, p. 166 



Ninth sternite not forming such a 

 plate, figs. 582, 593 11 



11. Ninth sternite with a semimembra- 



nous apical lobe set off by a con- 

 stricted neck, fig. 5 82. ..Agrypnia, p. 165 

 Ninth sternite not produced into such 

 a lobe, figs. 586, 593 12 



