THE VAGARIES OF COLOUR AND 

 STRUCTURE IN THE SEXES 



As a rule the male is rather smaller and 

 especially slenderer than the female, but there 

 are notable exceptions ; in one genus of the 

 fossors, Myrmosa for instance, the male is many 

 times larger than the female. In this case the 

 male is winged and the female is wingless. Also, 

 if there is a difference in brightness of coloration 

 between the sexes, as a rule the male is duller 

 than the female this is especially the case 

 among the bees but if there is any eccentricity 

 in the form of the limbs it is almost sure to 

 occur in the male, and I think one would not 

 go far wrong in saying that when peculiar 

 features occur in the female, the reason for them 

 is more or less apparent, whereas for the eccen- 

 tricities of the male there really often seems to 

 be no assignable cause. These male eccentricities 

 are often exceedingly marked. A very good 



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