DeRyke and Scott 31 



57 mm. 1 fish 15 mm. long; 1 fish 10 mm. long. 



52 mm. Stomach well filled with fish flesh. 



48 mm. 3 odonata larvae; 2 Hyalella knickerbockeri. 



50 mm. Stomach well filled with fragments of 3 may-fly larvae. 



38 mm. 1 bluegill 14 mm. long; several small pieces of fish flesh. 



56 mm. 1 bluegill 15 mm. long; about 5 cram, of fish flesh. 



51 mm. 1 fish 15 mm. long; 1 ephemerid nymph; 2 very small pieces of 



plant stem. 



41 mm. 3 odonata larvae; 2 Hyalella knickerbockeri; 1 cladoceran; 2 



ephemerida larvae. 



66 mm. Well filled with fish flesh. 



57 mm. 1 fish 30 mm. long; 3 Leuceruthrus micropteri. 



39 mm. 1 odonatid nymph. 

 Etheostoma caprodes Raf. (log perch). 



67 mm. 25 Hyalella; 1 tricopteron larva; abdomen of Haliplus beetle 



larva. 



78 mm. 2 odonata nymphs; 13 Hyalella; 2 Chironomus larvae. 



70 mm. 4 Chironomus larvae; 1 Chironomus pupa; 1 Hyalella knicker- 

 bockeri. 



42 mm. 1 Hyalella knickerbockeri; 3 cladocerans; 7 Chironomus larvae; 



1 may-fly larva. 

 !)() mm. 7 Hyalella knickerbockeri; 1 ostracod; 2 tricoptera larvae; 1 



Planorbis. 

 44 mm. 3 cladocera; 3 Hyalella knickerbockeri; 2 ephemerida larvae; 2 



Physa. 

 46 mm. 4 ephemerida larvae; 4 Hyalella knickerbockeri; 1 ostracod; 1 



tricopteron larva. 

 Eupomotis gibbosus Linnaeus (sunfish). 



68 mm. 8 partially-digested snails. 



Collection 35 



July 27, 1921. Chara, rushes and Potamogeton ; marl; two feet; clear; 

 clear; hot; 3:00 p. m. ; seine. 



Fishes examined hi this collection 



Perca flavescens Mitchill (yellow perch). 



145 mm. Fragments of a cray-fish; 11 Physa, average 2 mm. in diameter; 



1 Chironomus larva; small pieces of plant tissue. 

 147 mm. 1 tricopteron larva; 1 cray-fish 25 mm. long. 

 121 mm. 9 Physa, average 3 mm. in diameter. 

 172 mm. 1 cray-fish 40 mm. long; 1 Chara bud. 

 103 mm. 4 Physa, diameter of each was 3 mm. 



115 mm. 1 fish 10 mm. long; 11 Physa, average 2 mm. in diameter; 2 

 Chara buds. 

 87 mm. 1 cray-fish 30 mm. long. 

 Lepomis pallidus Mitchill (bluegill). 



55 mm. 502 Chydorus and Pleuroxus striatus; 51 ostracods; 1 tricopteron 

 larva; a few algal filaments. 



