4-n 



Polycentropus species 

 Coleoptera 



BcrosHs species 



Tropistcniiis species 



Pcltodytcs species 



StcncUuis species 



Unidentified parnid, etc., at least two species. 

 Diptera 



Chiroiiotnns teutons Fabricius 



Chiroiiomus viridicollis v. d. \^^ulp 



Chironomus fcrnigincoviltatus Zetterstedt 



CliiroHomiis inodcstjis Say 



Cricotopiis trifasciatiis Panzer 



Corcthra punctipcniiis Say 



Sepedon species 



Odontomyia species 



Unidentified tabanid 



Psychoda species 



4. Illinois River. Matanzas to Bcardstown, inclusive. 

 Twenty-five species; 59 collections; all zones com- 

 bined 

 Mollusca 

 Unionidae 

 Strophitns edentulus (Say). Young 

 Plagiola clegaus Lea. Young 

 Anodonta imhccillis Say 

 Viviparidae 



Vivipara contectoides W. G. Binney 

 Vivipara sitbpurptirca Say 

 Lioplax subcarinatus Say 

 Pleuroceridae 

 Plenrocera elevatum, var. Ictvisii Lea 

 Goniobasis livescens Menke 

 Anmicolidae 



Amnicola emarginafa Kiister 

 S'oinatogynis snbglobosus (Say) 

 Pbysidae 



Apparently at least two species. 

 Ancylidae 



Ancylus species 

 Hirudinea 



At least two species of leeches not recently 

 taken. 

 Insects 



Ephemerida 



Hexaqenia bilincata Say 



