STUDIES OF VARIATION IN INSECTS 



22^ 



The frequency polygon showing graphically the variation in 

 the vein part y^o* (see fig. ii) is as follows (fig. 14): 



"f-f I JH" fb "tl ^-v; 



Fig. 14. Frequency polygon of the variation in measurement y^^ (see fig. 

 11) in the right fore wings of 212 drone honey bees taken from laboratory hive 

 at one time; mean length of this vein part 42.1 micrometer units; index of 

 variability 2.027; coefficient of variation 4.81. 



Fig. 15. Frequency polygon of the variation in measurement ^-A (see fig. 

 11) in the right fore wings of 208 drone honey-bees taken from laboratory hive 

 atone time; mean length of this vein part 21.9 micrometer units; index of 

 variability 1.61 ; coefficient of variation 7.3. 



