The Descent of Man

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. (67. All the foregoing statements and
quotations, in regard to Cophotis, Sitana and
Draco, as well as the following facts in regard
to Ceratophora 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.)
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. (68. Mr. Swinhoe, 'Proc. Zoolog. Soc.'
1870, p. 240.)
[Fig. 34. Ceratophora Stoddartii. Upper figure;
lower figure, female.]
There are other and much more remarkable
differences between the sexes of certain lizards.