SEX, 



41 



In many Hf/menoptera tho sexes are very distinct. In the social insects 

 this is carried to a g'reat extreme and we find only a small number o£ 

 individuals with reproductive organs, the majority being- sexless workers 

 (fig's. 51 and 55). In solitary bees and Avasps, there is a distinct male, 

 and in one family the female is wingless, the male Avinged (fig. 40). 

 Beetles display little external difference ; exceptionally the male bears 

 horns (fig. 56) ; in some wood-boring beetles the male is wingless (fig. 86). 



Fia. 56. 

 3Iale Stag Beetle, 



Butterflies display great sexual differences in colour, form, etc. ; we repro- 

 duce one species (figs. 58-59) in which they are very strikingly different. 

 Moths rarelj- display great or noticeable differences, more often small 



