162 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



fig. 561, and without a diagonal 

 black line Phryganea, p. 174 



Pronotum with a diagonal black line, 

 fig. 562, anterior margin mostly 



yellow Banksiola selina, 



p. 169; Agrypnia straminea, p. 165 



Mesonotum with a pair of small scle- 

 rites near anterior margin, fig. 563 4 



Mesonotum without a pair of scle- 

 rites, sometimes with a very small 

 sclerotized area around the base of 

 1 seta, fig. 564 5 



Mature larvae attaining length of 30 

 mm Eubasilissa, p. 168 



Mature larvae attaining length of 

 only 20 mm Oligostomis, p. 167 



5. Pronotum with anterior margin black, 



fig. 564, and without a diagonal 



black line Agrypnia vestita, p. 166 



Pronotum with a diagonal black line, 

 fig. 565, anterior margin mostly 

 yellow 6 



6. Diagonal marks on pronotum meeting 



at posterior margin to form a V- 



mark, fig. 566 



Phryganeid Genus A, p. 167 

 Diagonal marks on pronotum not 

 reaching posterior margin but join- 



562 



563 



564 



565 



566 



Larvae of Phryganeidae 



Fig. 561. — Phryganea sp. 



Fig. 562. — Banksiola selina. 



Fig. 563. — Oligostomis ocelligera. (After Lloyd.) 



Fig. 564. — Agrypnia vestita. 

 Fig, 565. — Ptilostomis bcellifera. 

 Fig. 566. — Phryganeid Genus A. 



