COMPARATIVE VARIABILITY IN THE HONEY BEE. 



side the portion of greatest abnormality of the wing. The prin- 

 cipal reason for the measurement of this vein was to get a ratio 

 with the vein ;//, but as the actual measurements add to the evi- 

 dence, it seems advisable to give the table. The greatest range 

 of variability in workers was 9 mm., the least for drones 1 1 mm., 

 or, if we drop the two quite abnormal cases in Lot V., 9 mm. 

 Taking into consideration the relative lengths of the average veins, 

 34 5 mm. and 45 mm., this makes the greatest variation in workers 

 about equal to the least variation in drones, while the greatest 

 range in drones is over twice that of the greatest range in workers. 



TABLE III. 



VEIN M 



Drones. 



Workers. 



LENGTH OF CROSS- VEIN in. 



This vein shows no abnormalities and may therefore be con- 

 sidered as entirely outside the region so well marked about the 

 cells R and R 5 , which shows so much abnormal variation. If it 

 be argued that, since the more anterior veins tend to be abnormal, 



