118 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



4. Abdominal segments with lateral pro- 

 jections, fig. 456 



Ithytrichia, p. 1 23 



Abdominal segments without lateral 

 projections, fig. 541 5 



Middle and hind legs with tarsal claws 

 shorter or stouter, figs. 427, 429; 

 cases of various types 7 



7. Anal legs distinctly projecting from 



body mass, fig. 422; eighth abdomi- 

 nal tergite with a brush of setae, 



fig. 433 8 



Anal legs apparently combined with 

 body mass and only the claws pro- 

 jecting, fig. 541; eighth abdominal 

 tergite with only one or two pairs of 

 weak setae, fig. 541 . 9 



8. Thoracic tergites clothed with long, 

 slender, erect, inconspicuous setae, 

 fig. 431; case of sand grains, evenly 

 tapered and without posterior slit 

 Neotrichia, p. 154 



Thoracic tergites clothed with shorter, 

 stout, black setae which are con- 

 spicuous and appressed to the sur- 



Fig. 424. — Oxyethira dualis larva, legs. 

 Fig. 425. — Agraylea multipunctata larva, 

 legs. 



Fig. 426. — Mayatrichia ayama larva, legs. 



5. Middle and hind legs almost three 



times as long as front legs, fig. 424 



Oxyethira, p. 133 



Middle and hind legs not more than 

 one and one-half times as long as 

 front legs, fig. 425 6 



6. Middle and hind legs with very long, 



slender tarsal claws which are much 

 longer than tarsi, fig. 425; case 

 purselike, fig. 465 Agraylea, p. 122 



Fig. 427. — Neotrichia sp. larva, legs. 

 Fig. 428. — Orthotrichia sp. larva, legs. 

 Fig. 429. — Hydroptila ajax larva, legs. 

 Fig. 430. — Ochrotrichia unto larva, legs. 



