1872.] F. Stoliczka — On Indian Lizards. 87 
In connexion with the descriptive details, (often necessarily tedious), I 
have noted the geographical distribution of most of the species, as far as I 
had been able to obtain reliable information. 
Fam. LACEBTIDAE. 
From observations which I made on Tachydromus, Ophiops, and Acan- 
thodactylus, I presume that the form, size and number of shields on the 
antero-superior part of the head, and also partially the nasal shields are un- 
reliable for generic, and often even for specific, distinctions. 
Tacuyurowus sexlinicatus (I. R., # p- 69.) 
I have from the low valleys of Sikkim 25 specimens which I believe 
to be Daudin’s T. sexlincafws ; they certainly belong to the same species 
which occurs in Asam and in Burma, those from the latter piovince avm 0 
also been referred to the above named species by Dr. Gunther ■, and another 
specimen of the same species was noted by Blyth from Mergui. (Jouin. A. 
S. B., 1855, xxix, p. 71G). 
The Sikkim specimens present, however, certain variations. which deserve 
special notice, because they arc important as regards comparison with allied 
forms. The two nasals generally form a distinct suture between rostral and 
anterior frontal, rarely do these four shields meet in one point. In one spe- 
cimen the anterior frontal is regularly divided into two shields. The nasal 
is followed at the hinder inferior edge by a triangular shield, which rests on 
the posterior upper half of the first upper labial. In two specimens e 
anterior comer, and in one the upper corner is detached from the inferior 
postil asal and forms a separate little shield by itself. One specimen has on 
one side 3, on the other 4 chin-shields, and four specimens have regularly 4 
pairs of chin-shields, the two first pairs representing m size exactly, or very 
nearly, the first pair of such specimens as have only 3 pairs of clim-shields. 
There are always 8 longitudinal rows of enlarged scales on the upper 
side of the neck, separated from the occipitals by only a few smaller scales. 
Of those 8 rows the outermost on each side has the smallest scales and, al- 
though it can generally be traced at the side of the body, it always remains 
indistinct, somewhat irregular and is occasionally broken up, an t e scales 
never enlarge in size. The other six rows are well marked on the neck and 
have most probably given rise to the specific name sexlmeatus. The outer 
row on each side becomes somewhat obsolete before it reaches the shoulder, 
while the remaining four rows of enlarged scales continue on the body, and 
down to the tip of the tail. To these four rows Daudin’s name quadnhnea. 
tus evidently applies. 
* The reference 1 1. R.’ stands for Dr. Gunther’s ‘ Reptiles of British India.’ 
