DeRyke and Scott 27 



42 mm. Eye stalks and antennae of a very young cray-fish; 14 Hyalella. 

 35 mm. 1 haliplidae larva; 10 Hyalella. 



53 mm. 1 fish 15 mm. long; 1 piece of fish flesh 3 cmm.; 2 Leuceruthrus 



micropteri. 

 31 mm. 3 Hyalella; 4 partially digested cladocera; 1 Leuceruthrus 



micropteri. 

 37 mm. 1 Hyalella. 



52 mm. 4 cmm. of fish flesh; 2 Leuceruthrus micropteri. 

 Etheostoma caprodes Raf. (log perch). 



70 mm. 11 Hyalella; 1 ephemerid nymph; 1 tricopteron larva, 



75 mm. 1 Chironomus larva; 4 caddis worms and cases; 25 Hyalella; 



several grains of sand. 

 77 mm. 1 neuropteron larva; 2 ephemerida larvae; 29 Hyalella; 8 



Chironomus larvae; 1 ostracod; several grains of sand. 

 62 mm. 1 Chironomus larva; 1 ephemerid larva; 3 caddis worms and 



cases; 22 Hyalella; sand and debris. 



66 mm. 12 Hyalella; 3 tricoptera larva; 1 tricopteron case. 



69 mm. 12 Hyalella; 2 ephemerida larvae; 1 Chironomus larva; 1 tricop- 



teron and case. 

 64 mm. 9 Hyalella; 1 tricopteron and case; several legs of a small insect. 

 62 mm. 24 Hyalella. 



70 mm. 3 tricoptera and cases; 17 Hyalella; grains of sand and debris. 

 62 mm. 10 Hyalella; 4 cmm. of animal tissue. 



62 mm. 11 Hyalella; 4 tricoptera larvae. 



61 mm. 1 ephemerid; 17 Hyalella. 



43 mm. 1 ephemerid larva; 15 Hyalella; grains of sand and debris. 

 70 mm. 31 Hyalella. 



72 mm. 2 Chironomus larvae; 4 Hyalella. 

 Labidesthes sicculus Cope (skipjack). 



67 mm. Empty. 



Collection S3 



July 16, 1921. Algae, Ceratophyllum, Potamogeton; sand and marl; 

 three feet; clear; extremely hot and clear; 10:30 a. m. ; seine. 



Fishes ex.uniined in litis- collection 



Lepomis pallidus Mitchill (bluegill). 



101 mm. 25 Chironomus larvae; 3 ostracods; mass of partially-digested 

 animal tissue; sand and debris. 

 75 mm. 6 Chironomus larvae; other contents digested beyond possibility 



of identification. 

 61 mm. 1 small snail; 1 tricopteron case; 10 Chironomus larvae; 9 



ostracods. 

 59 mm. 17 cladocera; 42 ostracods; 8 Chironomus larvae; 3 Physa; 1 

 Planorbis snail; 1 tricopteron and case. 

 Ill mm. 41 Chironomus larvae; 2 tricoptera larvae; 3 ephemeridae lar- 

 vae; 7 ostracods; 3 Chironomus larvae; 2 Hyalella; algae; sand; silt 

 and debris. 



