STUDIES OF VARIATION IN INSECTS 



225 



The frequency polygon showing graphically the variation in 

 the vein part f-g (see fig. n) is as follows (fig. 14): 



FIG. 14. Frequency polygon of the variation in measurement f-g (see fig. 

 ii ) 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 g-h (see fig. 

 n ) 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 1.6 1 ; coefficient of variation 7.3. 



