HABITS OF YELLOW PERCH. 307 
Jn tie PER AR TK A, AA AQ SMOOWNY @ 
50 
is 
40 ae 
Fig. 14. es 
30 CorethraLarva ; 
Fig 10. 
Ephemerid Nymphs 
* Se o . Fi 5 /6. 
. Odonata Nymphs 
fo Ae Fig. ff 
ue Neale Leeches 
oS ADO K 
5 \ on fis 
15 : if a Fig. 18. 
40 
Fics. 14 to 18.—Percentage by volume of five constituents of perch food which increased markedly during the spring or autumn, 
-0-0-0-, Lake Mendota, ro1s;, -- ---- , Lake Mendota, 1916; .....-, Lake Wingra, 1916-17; , average. 
