STUDIES OF VARIATION IN INSECTS 



Class A : 81 individuals (5 1 males, 26 females, and 4 so broken 

 as to make it impossible to determine the sex) had all the feet 5- 

 segmented. 



Class B : 10 (8 males, 2 females) had the left hind foot 4- 

 segmented. 



Class C : 5 (2 males, 2 females, i broken) had right hind 

 foot 4-segmented. 



Class D : 5 (4 males, i female) had left middle foot 4-seg- 

 mented. 



Class E: 2 (i male, i female) had right middle foot 4-seg- 

 mented. 



Class F : 4 (3 males, i female) had right fore foot 4-seg- 

 mented. 



Class G : 3 (2 males, i female) had left fore foot 4-segmented. 



Class H : 2 (i male, i female) had both hind feet 4-seg- 

 mented. 



Class I : i (female) had both middle feet 4-segmented. 



Class J : i (male) had both fore feet 4-segmented. 



Class K : i (male) had left hind foot and left fore foot 4-seg- 

 mented. 



Class L : i (female) had left hind foot and left middle foot 

 4-segmented. 



Class M : i (female) had right hind foot and left fore foot 4- 

 segrnented. 



Class N: i (female) had both hind feet and right middle 

 foot 4-segmented. 



Thus 71 per cent, had all the feet 5-segmented, which con- 

 dition is one of the structural characteristics assigned by ento- 

 mologists, not alone to this species or even genus of cock- 

 roaches, but to the whole cockroach family, the Blattidae. The 

 remaining 29 per cent, had one foot (29 cases), two feet (7 

 cases), or three feet (i case) 4-segmented. Of the varying 

 individuals 24 are males, 12 females, and five are so broken as 

 to make the sex indeterminable, while of the normal individ- 

 uals, 51 are males and 26 are females, a practically identical 

 proportion, and considered in the light of the total numbers of 

 males and females in the lot, a proportion indicating that the 

 varying individuals are almost exactly evenly distributed be- 

 tween the two sexes. 



