DeRyke and Scott 25 



55 mm. 3 heads of Chironomus larvae; 3 badly torn cladocerans; 2 



macerated Hyalella. 

 62 mm. 1 snail body, 3 mm. in diameter. 

 60 mm. 2 Chironomus larvae; 2 cladocerans. 

 65 mm. 18 Haliplus beetle larvae; grains of sand and debris. 

 69 mm. 5 fragments of partially-digested snails; 1 Hyalella; 3 



ephemerida larvae. 

 65 mm. 6 snail bodies; small piece of plant stem. 

 60 mm. Empty. 

 Labidesthes sicculus Cope (skipjack). 



71 mm. 1 tricoptera larva and case; 1 adult chironomidae ; 5 very small 



aphids. 

 75 mm. 10 aphids. 

 53 mm. 1 small half-digested insect. 

 58 mm. 1 small wasp; 2 ephemerida larvae. 



84 mm. 3 tricoptera cases; 3 aphids; several grains of sand. 



56 mm. A very small, half-digested mass of insect tissue. 

 74 mm. 13 very small cladocerans. 



Collection 31 



July 6, 1921. Potamogeton, Chara, Myriophyllum, Ceratophyllum, spatter- 

 dock; fine sand; two feet; clear; clear; 10:00 a. m. ; seine. 



Fishes examined in this collection 



Perca flavescens Mitchill (yellow perch). 



79 mm. Fragments of odonatid nymph; 3 odonata nymphs; a small piece 

 of plant tissue. 

 Lepomis pallidus Mitchill (bluegill). 



43 mm. 4 ostracods; 1 water mite; 881 cladocerans, Bosmina obtusirostris 



and Pleuroxus denticulatus. 



39 mm. 5 Chironomus larvae; 1 cladocera. 



40 mm. Chironomus larvae; 4 ostracods; 3 Hyalella knickerbockeri ; 2 



cladocera; sand and debris. 

 50 mm. 1 tricopteron and case; 8 water mites; 9 Chironomus larvae; 



1 Hyalella; Spinitectus gracilis. 

 Micropterus salmoides Lacepede (large mouth black bass). 



38 mm. 2 Chironomus larvae; 1 small piece of fish flesh. 

 46 mm. Stomach well filled with fish flesh. 



44 mm. 1 Chironomus larva; stomach well filled with fish flesh. 

 108 mm. Well filled with fish flesh and 24 Leuceruthrus micropteri. 



32 mm. Stomach well filled with fish flesh. 

 Eupomotus gibbosus Linnaeus (sunfish). 



77 mm. 1 Spinitectus gracilis; stomach well filled with partially-digested 

 insect tissue. 

 Catostomus nigricans Le Sueur (hog-molly). 



85 mm. 6 Chironomus larvae; 1 tricopteron case; grains of sand and 



debris. 

 90 mm. 42 Chironomus larvae; grains of sand and debris. 

 108 mm. 9 Chironomus larvae; sand and debris. 



3—22243 



