Chap. XII.] 



REPTILES. 



31 



nishecl with a crest, which runs along tlie back and tail, 

 and can be erected at pleasui'e ; but of this crest the female 

 does not exhibit a trace. In the Indian Cophotis ceylanica, 

 the female possesses a dorsal crest, though much less de- 

 veloj)ed than in the male ; and so it is, as Dr. Giinther in- 

 forms me, with the females of many Iguanas, Chameleons, 

 and other lizards. In some species, however, the crest is 

 equally developed in both sexes, as in the Iguana tubercu- 

 lata. In tlie genus Sitana, the males alone ai'e furnished 

 with a large throat-pouch (Fig. 33), which can be folded 

 up like a fan, and is colored blue, black, and red; but 

 these splendid colors are exhibited only during the pair- 

 ing-season. The female does not possess even a rudiment 

 of this appendage. In the Anolls cristatellus, according 

 to Mr. Austen, the throat-pouch, which is bright red mar- 

 bled with yellow, is present, though in a rudimental con- 

 dition, in the female. Again, in certain other lizards, both 

 sexes are equally well provided with throat-pouches. Here, 

 as in so many previous 

 cases, we see, with species 

 belonging to the same 

 group, the same character 

 confined to the males, or 

 more largely developed in 

 the males than in the fe- 

 males, or 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 be- 

 come erected when the animal is excited. They occur in 

 both sexes, but are best developed in the male when ar- 



FiG. 33. — Sitana minor. Male, with tlie 

 gular pouch expanded (from Gun- 

 ther's 'Keptiles of India'). 



