418 



10. Dragon-fly Nymphs (Odonata) 



Ischmira species. Channel, McKinley Bridge, in strong current. 

 Goniphits plagiatus Selys. Channel at Liverpool. 

 Goniphus species. Near shore at Kingston Ferry. 



11. Orl-fly Larvae (Neuropteraj 



Sialis infumata Newman. Near shore, S. W. end lower Peoria 

 Lake. 



Pre-1920 Bottom Species* Recently 



Missing from Illinois River and Peoria Lake 



Dredge Hauls 



From Species Lists of 1913-1915, 



REFERRED TO AS GrOI'P III IN PRECEDING T.\BLES 



1. lllhw'is River and Peoria Lake, Chillicothe to P. P. U. 



Bridge, inclusii'e. Tzvche species; 46 collections; 

 all zones couibined. 

 Mollusca 

 Viviparidae 



Fivipara conteetoidcs W. G. Binney 



Vivipara subpurpurea Say 



Lioplax subcarlnatus (Say) 

 Amnicolidae 



A>nnicola einarginafa Kiister 



Amnicola liniosa (Say) 



Somatogynts siibglobosus (Saj') 

 Ancylidae 



Ancylus species 

 Insects 



Ephemerida 



Hexagenia bilineata Say 



Callibactis species 



Caenis species 

 Diptera 



Chironoinus tentans Fabricius 



Chironomus nigricans Johannsen 



2. Illinois Ri^rr, Pekin to Copperas Creek Daw. inclusive. 



Thirteen species; 30 collections; all cones combined. 

 ^lolhisca 

 LTnionidae 



Anodonta iinbecillis Say 



• No mus.sols included except very young indi\'it1ualR or dwarf 

 species: i. e.. tliose talten witii mud dipper or small iron dredije. 



