STUDIES OF VARIATION IN INSECTS 24 1 



Considering first variations in character of venation (for the 

 nature of these variations see p. 214, et seq.). 



Of the 7 cases of extreme variation consisting of the interpo- 

 lation of a new complete or nearly complete cell in one or the 

 other of the fore wings (4 in left, 3 in right) in a lot of 300 

 drones from laboratory hive, the opposite wing in 5 cases shows 

 no variation while in 2 it shows only " slight" variation (slight 

 spur at 2, 3 or 4). Of the right fore wings (in this lot) 84 show 

 " var. I complete" (entire absence of a short cross vein) while 

 79 left fore wings show this variation. Of the individuals show- 

 ing this condition in either right or left wing 47 show it also in 

 the opposite wing, while 15 individuals show " var. i complete " 

 in one wing coincidently with *' var. i incomplete " in the other, 

 or " var. i incomplete " in both. 



In the matter of the correlation of the variations in the hind 

 wings in this lot of 300 drones, of the 3 extreme cases of the 

 interpolation of a new complete cell in one wing (2 in left, i in 

 right) in 2, the other wing shows no variation and in i it shows 

 " var. I fair." In 105 right wings there is a spur at i " slight" 

 to " marked," and such a condition occurs in 102 left wings. 

 Of these cases the condition occurs coincidently in both wings 

 in 71 cases. So much for bilateral correlation of variations in 

 character of venation in this lot. 



Considering now the conditions of metameric correlation in 

 the same lot, we note that in the 7 (extreme) cases of interpo- 

 lation of a new cell in the fore wing, the same individual shows 

 in no case the extreme case of the interpolation of a cell in the 

 hind wing of the same side (or of the other side for that matter), 

 so that it is also true that of the 4 cases of an interpolation of a 

 new cell in a hind wing none shows a similar extreme variation 

 in either front wing. 



In the lot of 200 drones taken from cells in another hive, of 

 the 2 cases of extreme variation consisting of the interpolation 

 of a new complete or nearly complete cell in one or the other 

 of the fore wings (i in left, i in right), the opposite wing in 

 neither case shows any variation. In the several (12 in right 

 fore wing, 11 in left fore wing), curious cases of still more ex- 

 treme variation, reaching what may fairly be called a mutilation 



