REPTILES. 



351 



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 impunity"— I presume from 

 despair.™ 



There are other and much more remarkable differences between 

 the sexes of certain lizards. The male of Ceratophora aspera 

 bears on the extremity of his snout an appendage half as long 



Fig. 33. Sitana minor. Male with 

 the gular pouch expanded 

 (from Gunther's 'Reptiles of 

 India'). 



Fig. 34. Ceratophora Stod. 

 dartli. Upper figure, 

 male; lower figure, fe- 

 male>. 



as the head. It is cylindrical, covered with scales, flexible, and 

 apparently capable of erection: in the female it is quite rudimen- 

 tal. In a second species of the same genus a terminal scale forms 

 a minute horn on the summit of the flexible appendage; and in a 

 third species (C. Stoddartii, fig. 34) the whole appendage is con- 

 verted into a horn, which is usually of a white color, but assumes 

 a purplish tint when the animal is excited. In the adult male of 

 this latter species the horn is half an inch in length, but it is of 

 quite minute size in the female and in the young. These appen- 

 dages, as Dr. Giinther has remarked to me, may be compared with 

 the combs of gallinaceous birds, and apparently serve as orna- 

 ments. 



" All the foregoing statements and quotations. In regard to Cophotis, 

 Sitana and Draco, as well as the following facts in regard to Cerato- 

 phora and Chamaeleon, are from Dr. Gunther himself, or from his 

 magnificent work on the 'Reptiles of British India,' Ray Soc. 1864, 

 pp. 122, 130, 135. 



»« Mr. Swinhoe, 'Proc. Zoolog. Soc' 1870, p. 240. 



