DeRyke and Scott 9 



38 mm. 15 Hyalella. 



39 mm. 5 ephemerida larvae; 3 Hyalella. 



51 mm. 1 fish 8 mm.; 1 fish 9 mm.; 1 fish 8 mm.; 3 Leuceruthrus. 

 42 mm. 30 ephemerida larvae. 



47 mm. 15 ephemerida larvae. 



32 mm. 16 ephemerida larvae; 3 Leuceruthrus. 

 44 mm. 10 ephemerida larvae; 1 Chironomus larvae. 

 42 mm. 1 fish 7 mm. ; 1 fish 10 mm. 

 Catostomus nigricans Le Sueur (hog-molly). 



142 mm. Mass of animal tissue; heads and appendages of several beetle 

 larvae were distinguishable, but not clearly enough for identification. 



Collection U 



July 22, 1919. Potamogeton, Chara, Vallisneria, spatter-dock, algae and 

 duck weed; sand; one foot; clear; clear; 10:00 a. m. ; seine. 



Fishes examined in this collection 



Lepomis pallidus Mitchill (bluegill). 



15 mm. 6 Pleuroxus denticulus; 41 Cyclops. 



Collection 5 



July 24, 1919. Potamogeton, rushes; sand; one to two feet; clear; clear; 

 2:30 p. m. ; seine. 



Fishes examined in this col Ice I ion 



Pei-ca flavescens Mitchill (yellow perch). 



84 mm. 81 Sida crystallina; 6 tricoptera larvae; 3 Chironomus larvae; 



2 nematoda. 



72 mm. Fragments of insects or insect larvae. 



86 mm. 25 Chironomus larvae; some insect fragments; 4 Planorbis; 



3 Physa; algal fragments and silt. 



77 mm. Small mass of animal tissue, otherwise empty. 



70 mm. Fragments of insect larvae. 



44 mm. 8 Chironomus larvae and a few algal filaments. 



58 mm. One-half of the contents consists of algal filaments; the rest 

 consisted of 8 Chironomus larvae; 5 ostracoda; 2 Planorbis; 1 Physa. 



49 mm. 1 Planorbis; 3 Chironomus. 



48 mm. 1 Ceratopogon larva; 5 Chironomus larvae; 2 ostracoda. 



53 mm. 3 Chironomus larvae; 2 ostracoda; parts of a large beetle; 1 



Planorbis. 

 46 mm. Mass of animal tissue. 



53 mm. 3 large fragments of insect larvae. 



51 mm. 1 Chironomus larvae; head of Dytiscus larvae; 5 Tanypus larvae. 



75 mm. 4 Hyalella; 2 Chironomus larvae; 1 nematoda; 3 ostracoda. 



54 mm. 1 Ceratopogon larvae and a few fragments of a beetle larvae. 

 Micropterus salmoides Lacepede (large mouth black bass). 



67 mm. 1 bluegill 24 mm.; 1 bluegill 27 mm.; 1 damsel-fly; 1 spider; 

 64 cm. of fish flesh; 12 Leuceruthrus. 



2—22243 



