306 BULLETIN OF THE BUREAU OF FISHERIES. 
FLL (Al geld AEA ee, 
WB, 
n 
20 us 
Fig./0 " 
Caddis Fy He 
Larvae neh 
‘ \ 
15 we 
| \ 
i] \ 
il 
k | \ 
a ROA! 
r \ ! \ 
© ° \ 
10 rh 
| 1 ' \ 
j \ { \ 
Sa, 
¢ ! f 
. ; 
ot ‘ ! 
O = at psec: 
Fig. l/. 
Corerthra 
45 Adults ad Ne 
cA v 
4) crmalgee ae 
iT) 
: Fig, 12, OP at 
2 raytishes if 
Qo ——= 
/0 a ang Fig. 13. 
“  \ Lamelibranchs 
5 
Fics. 10 to 13.— Percentage by volume of four constituents of perch food which increased markedly during the summer. -0-0-0-, 
Lake Mendota, to1s; - - - - - - , Lake Mendota, 1916; ....... , Lake Wingra, 1916-17; 
, average. 
