STUDIES OF VARIATION IN INSECTS 28 1 



right midde pair fused ; 42 individuals showing other miscella- 

 neous variation. 



A lot of 224 individuals from two miles east of Mountain View, 

 California (nine miles from Stanford campus), shows variation 

 frequencies as follows : 



Class A : 130 individuals, with all spots free. Class B : 28 

 individuals, with both middle pairs fused. Classes C and D : 

 23 individuals, with middle pair on either right or left side 

 fused ; 43 individuals, miscellaneous. 



A lot of 145 individuals from Oakland, California (40 miles 

 from Stanford campus), shows variation frequencies as follows : 



Class A : 49 individuals, with all spots free. Class B: 61 

 individuals, with both middle pairs fused. Classes C and D : 

 14 individuals, with either right or middle pair fused; 21 indi- 

 viduals, miscellaneous. 



A lot of 72 specimens from Arcata, California (200, approxi- 

 mately, miles from Stanford campus) shows variation frequen- 

 cies as follows : 



Class A : 7 individuals, with all spots free. Class B : 47 

 individuals with both middle pairs fused. Class C : 6 indi- 

 viduals, with left middle pair fused. Class D : 8 individuals, 

 with right middle pair fused ; 54 individuals, miscellaneous. 



A lot of 103 individuals from Steven's Creek, California, (15 

 miles from Stanford campus), shows the following variation fre- 

 quencies : 



Class A: 59 individuals, with all spots free. Class B: 22 

 individuals, with both middle pairs fused. Classes C and D ; 

 ii individuals, with either left or right middle pair fused; n 

 individuals, miscellaneous. 



A lot of 149 individuals from Menlo Park, California (2 miles 

 from Stanford campus), shows variation frequencies as follows : 



Class A : 49 individuals, with all spots free. Class B : 78 

 individuals, with both middle pairs fused. Class C : 6 indi- 

 viduals with left middle pair fused. Class D: 3 individuals 

 with right middle pair fused ; 13 individuals, miscellaneous. 



A lot of 26 individuals from Pacific Grove, California, 90 

 miles from Stanford campus, shows the following variation fre- 

 quencies : 



Class A : 7 individuals, with all spots free. Class B : 9 



