STUDIES OF VARIATION IN INSECTS 



249 



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 leny^ih and breadth indicate variations in actual 



fPTasses 8f-g2* g3-g'f: 8?-gfa: Bl-rib t.'i-'Ji.^ ^l-ii 1:5 -'i'i-[ 45-'tt 

 [yariatcs.,.3.,,,.,_l3^.^:;,15___i_.-3g....!„.')ei„.^;..,3L .,L:[2,.^a:,_-^5- .- 



Vi-'-\<i. 100 



^5'^' 



.'ijflQtal Jb2i,:J 



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

 wings of 1S2 male black ants collected at one time in one place; mean 90 

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



C^'ass'es! 1^ 15 



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. 



