455 



Station jo. — Sail Fork 100 feet below (east of) Spoon River, Sep- 

 tember 16. The water is high and very muddy but when the bottom is 

 disturbed it churns up black. The pure water of Spoon River undoubt- 

 edly helps very considerably in ])urifyin,e; the waters of the Fork but these 

 are still polluted, at least at this season. 



Hemiptera. Corixidae : adults and nymphs. 



Coleoptera. I^ytiscidae: Laccopliihts proxiiiius Say, adults. 



L. maadosus (Germ.), adults. 

 Hydrophilidae : Tropistcnius [i I a b c r (Ilbst.). 

 adults. 

 T. lateralis (Fabr.), adults. 

 Enochnts ochraccus (Melsh.), adults. 

 Diptera. Chironomidae : Chironoiiius .sp., larvae abundant. 



No sludge-worms were noted today. 



Station j/. — Collections made in the Salt Fork 100 feet below (east 

 of) the entrance of the Boneyard stream, September 2'.]. Water very 

 foul, all stones being draped with the foul-water fungus, Spliacrotilus 

 natans Kutzing. 



Diptera. Chironomidae: Chironomus sp., a few larvae. 



No sludge-worms noted. 



Station ^s. — Collection made 100 feet above (west of) the Boneyard 

 stream, September 23. The water looks clear but along the margins the 

 net stirs up black clouds as in a polluted stream. 



Odbnata. Cocnagrionidae : Iscluutra vcrticalis (Say), na- 



iades. 

 Coleoptera. Hali|)lidac: Pcltodylcs TJ-piinctatiis (Say), adults. 



Hydro])hilidae : Tropistcrnus g lab e r (Hbst.) , 

 adults. 

 Ascllus is very common here. 



Station j?J. — Collection made in the Salt Fork 250 feet above (west 

 of) the entrance to the Boneyard stream, September 2:5. The water here 

 is comparatively pure, the stones being draped with green algae, with 

 beds of Elodca growing along the margin. 



Hemiptera. N'eliidac: Rtnujovclia obcsa Uhl, adults. 



Trichoptcra. 1 lydropsychidai- : Hydropsychc sp., larvae and 



nets. 



Coleoptera. llaliplidae: Pcltodytcs i^-punctatiis (Say), adults. 



Cambarns sp., young and adults, and Asellus are very common at 

 this point. 



