334 



THE DESCENT OF MAN. 



in Mr, Bates' collection, are generally redder but rather 

 duller than the females, the latter being colored of a more 

 or less splendid golden-green. On the other hand, in one 

 species the male is golden-green, the female being richly 

 tinted with red and purple. In the genus Esmeralda the 

 sexes differ so greatly in color that they have been ranked 

 as distinct species; in one species both are of a beautiful 

 shining green, but the male has a red thorax. On the 

 whole, as far as I could judge, the females of those 

 Prionidae, in which the sexes ditfer, are colored more richly 

 than the males, and this does not accord with the common 

 rule in regard to color when acquired through sexual 

 selection. 



[K most remarkable distinction between the sexes of many 

 beetles is presented by the great horns which rise from the 

 head, thorax and clypeus of the males; and in some few 

 cases from the under surface of the body. These horns 

 in the great family of the Lamellicorns, resemble those of 

 various quadrupeds, such as stags, rhinoceroses, etc., and 

 are wonderful both from their size and diversified shapes. 

 Instead of describing them, I have given figures of the 

 males and females of some of the more remarkable forms. 

 (Figs. 16 to 20.) The females generally exhibit rudiments 



Fig. 16. Chalcosoma atlas. 



Upper figure, male (reduced;: lower figure, female 

 (natural sige). 



