D. B. CASTEEL AND E. F. PHILLIPS. 



to vary, the workers' wings were quite constant. The greatest 

 range of variation in workers was found to be 13 mm., while the 

 least range in drones was 19 mm. The fact that the average 

 length of the cell in drones was between 96 mm. and 102 mm., 

 while the average length for workers was about 75 mm., will 

 however account for part of this greater range since, with a given 

 range of variability, the greater the length, the less the actual 

 variation. This, however, does not account for the extreme differ- 

 ence which we find and in this case again, as in the first set of 

 measurements, we find a much greater variability in drones than 



in workers. 



TABLE II. 



DIAGONAL CELL J? t . 



Drones. 



1 No individuals found in columns omitted. 



Workers. 



LENGTH OF VEIN M z . 



This is not a specialized vein, and while it has for its anterior 



boundary the edge of the cell R v it shows comparatively little 



abnormality. A few cases of extra veins thrown in in the 



region of this vein will be discussed later, but it is located out- 



