STUDIES OF VARIATION IN INSECTS 



in fig. 34), and the length of the sharply subtended part of 

 another vein indicated as D in fig. 34. The differences in. the 

 measurements of length and breadth indicate variations in actual 



FIG. 38. Frequency polygon of the variation in length of the right fore 

 wings of 182 male black ants collected at one time in one place; mean 90 

 micrometer units ; index of variability 3.61 ; coefficient of variation 4. 













FIG. 39. Frequency polygon of the variation in width of left fore wings of 

 192 male black ants collected at one time in one place ; mean 27.03 micrometer 

 units; index of variability T.IQ; coefficient of variation 4.4. 



