42 
Psyche 
[Vol. 87 
E 
E 
E 
E 
E 
E 
E 
rTEm 
3 4 5 6 7 8 
BODY LENGTH, 
* 10 11 12 
MM 
Figure 1. Size-class distribution of nymphs of Baetisca berneri based on body 
length. The number of individuals each month is in parenthesis. 
