778 DR. A. GUNTHER ON A NEW INDIAN LIZARD. [Nov. 15, 
When I first observed a spur from the subcostal in form 1 of 
the above species, I supposed that it was an ordinary monstrosity ; 
but finding that exactly one-sixth of the specimens in the Museum 
collection possessed the same character, more or less developed 
from the same nervure, I thought it a fact of some significance 
and worthy of being recorded. It is well known that the greater 
number of the genera of diurnal Lepidoptera are founded upon neural 
characters, and in the genus Jéhomia the species are separated chiefly 
by slight modifications in the venation of the hind wing. If, then, 
any species can be proved to exhibit inconstancy in the venation of 
its hind wings, it must, at the least, cast the shadow of a doubt 
upon the value of species which are precisely alike in every character 
but this. 
Secondly. I think the above modifications interesting, as showing 
how characters do occur which, if of any advantage to the species, 
may be further developed by natural selection, and thus result in 
forming distinct genera. Ina paper which I have recently published 
upon the genera of the Pierinz (a subfamily which I maintain to be 
most constant in neuration) I have found it necessary to divide the 
genera into three groups, distinguished from each other by the num- . 
ber of branches to the subcostal nervure in the front wings; an 
additional branch to the subcostal in the hind wings would be quite 
as important a character, and would have the effect of widely sepa- 
rating two genera, otherwise allied, in any systematic arrangement 
founded upon structural characters. ; 
7. Description of a New Indian Lizard of the Genus Calotes. 
By Dr. A. Gtnrner, F.Z.S. &c. 
(Plate XLV.) 
Mr. Jerdon has brought home with him a considerable number of 
examples of Khasyan Calotes, and has convinced me that two spe- 
cies have been hitherto confounded under the name of Calotes maria 
(Gray). The one has the scales of the throat of rather small size ; 
the supertympanic series of spines is at a distance from the tym- 
panum; the nuchal spines are narrow, slender, very rigid, and not 
flexible ; besides, this form has never a black streak through the eye. 
To this form belongs the largest of the four typical examples of 
Calotes maria, which name, therefore, must be retained for it. Mr. 
Blyth’s diagnosis of his Calotes platyceps agrees entirely with this 
form, and not with the next, as supposed by Mr. Jerdon (Proce. As, 
Soc. Bengal, 1870, p. 77). 
The second form, Mr. Jerdon informs me, remains always of 
smaller dimensions; the nearly perfect identity of coloration of cer- 
tain specimens with others of C. maria is a very surprising fact, the 
differences from this species being solely structural. Its gular scales 
are large; the supertympanic series of spines is immediately above 

