ist oF Minnesota—l918 
a 
ENTOMOLOC 
SPORT STATE 
E 
R 
NTEENTH 
DEVE 
o 
&4 
eugceeeeauuaeet 
Time in Days.- 
! 
II 
PLATE 
1M 
the small squares, reading 
The record of each beetle is recorded in the ten spaces between the 
Temperature is indicated by the dotted line 
by 
days is indicated 
raphic comparison of the length of various stages in the life cycle of Tribol 
Time in 
the plate. 
ALES 
confuswm under different food cenditions. 
across the top of the plate. 
across 
