2 5 



KELLOGG AND BELL 













Clas 

 tift 



I 



H 



FIG. 40. Frequency polygon of the variation in width of the right fore wings 

 of 194 male black ants, collected at one time in one place; mean 27.02 microm- 

 eter units; index of variability 1.14; coefficient of variation 4.22. 





FIG. 41. Frequency polygon of the variation in measurement C (see fig. 34) 

 in left fore wings of 194 male black ants, collected at one time and in one place ; 

 mean 13.34 micrometer units; index of variability, 1.119; coefficient of varia- 

 tion 8.4. 



