Chap. XIL 



Reptiles. 



355 



Fig. 3"*. Sitana minor. Male with the 

 gular pouch expanded (from Giinther's 

 ' Reptiles of India '). 



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 

 colours baffle description, are 

 furnished with skinny appen- 

 dages 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 developed when the male 

 arrives at maturity, at which 

 age the middle appendage is 

 sometimes twice as long as the head. Most of the species like- 

 wise 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.' 57 



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 impu- 

 " nity," — I presume from despair. 68 



There are other and much more 



remarkable differences between the 



sexes of certain lizards. The male 



of Ceratophora aspra bears on the 



extremity of his snout an appendage 



half as long as the head. It is 



cylindrical, covered with scales, 



flexible, and apparently capable of 



erection: in the female it is quite 



rudimental. In a second species 



of the same genus a terminal scale 



forms a minute horn on the summit of the flexible appendage ; 



67 All the foregoing statements nificent work on the ' Reptiles of 



and quotations, in regard to Cophotis, British India,' Ray Soc. 1864, pp. 



Sitana and Draco, as well as the 122, 130, 135. 



following facts in regard to Cerato- 68 Mr. Swir.hoe, ' Proc. Zoolog. 



phora and Chamaeleon, are from Dr. Soc.' 1870, p. 240. 

 Giinther himself, or from his mag- 



Fig. 34. Ceratophora Stoddartii 

 Upper figure, male ; lower figure, 

 female. 



