SEXUAL SELECTION 461 



and is colored blue, black, and red; but these splendid 

 colors are exhibited only during the pairing season. The 

 female does not possess even a rudiment of this appen- 

 dage. In the Anolis cristatellus, according to Mr. Austen, 

 the throat-pouch, which is bright red marbled with yellow, 

 is present in the female, though in a rudimental condition. 

 Again, in certain other lizards, both sexes are equally well 

 provided with throat-pouches. Here we see with species 

 belonging to the same group, as in so many previous cases, 

 the same character either confined to the males or more 

 largely developed in them than in the females, or again 

 equally developed in both sexes. The little lizards of the 

 genus Draco, which glide through the air on their rib- 

 supported parachutes, and which 

 in the beauty of their colors baffle 

 description, are furnished, with 

 skinny appendages to the throat 

 "like the wattles of gallinaceous 

 birds." These become erected 

 when the animal is excited. They 

 occur in both sexes, but are best 



, , -, , , , , . Fio. 83. — Sitana minor. Male with 



developed when the male arrives the guiar pouch expanded (from 



7 . . , , . , , , Qimther's '^Eeptiles of India"). 



at maturity, at which age the 



middle appendage is sometimes twice as long as the head. 

 Most of the species likewise have a low crest running 

 along the neck; and this is much more developed in the 

 full-grown males than in the females or young males." 



A Chinese species is said to live in pairs during the 

 spring; "and if one is caught, the other falls from the tree 

 to the ground, and allows itself to be captured with im- 

 punity" — ^I presume from despair. °° 



There are other and much more remarkable differences 

 between the sexes of certain lizards. The male of Gerato- 



^' AH the foregoing statements and quotations, in regard to Oophotis, 

 Bltana, and Draco, as well as the following facts in regard to Ceratophora and 

 Ohamseleon, are from Dr. Giinther himself, or from his magnificent work on the 

 "Reptiles of British India," Bay Soc, 1864, pp. 122, 130, 135. 



«8 Mr. Swinhoe, "Proo. Zoolog. Soc, 1870, p. 240. 



