REPTILES. 
15 
Description. — The general form of this new species is similar to that of Pr, Weigmannii^ but less 
elongate and somewhat more depressed, resembling in general appearance some of the forms 
of the genus Sceloporus. Plead covered with rather small and consequently numerous scales, 
slightly elevated, and separated from each other by distinct and deep lines. A single series of 
small scales between the labial scales and the orbit. The exterior margin of the ear is entire 
and even. Scales of the temple and at the sides of the neck wholly granular, the latter very 
small. The scales of the back are small, flat, with a very low carina, and not pointed at the 
posterior extremity. There are about twenty rows of dorsal scales. The posterior surface of 
the thighs is granulated, excepting a small patch near the tail of imbricated scales, similar to 
those of the inferior surface, as in Pr. Weigmannii. The tail is of moderate length, and the 
scales which cover it are short, depressed, and obtuse in comparison with those of several other 
species. The pre-anal pores, which are peculiar to the male, are about ten in number. 
The general colour is gray, with two light longitudinal lines on each side, and a row of 
black spots along the inner margin of the dorsal ones. The under surface is nearly white, with 
black dots under the throat. 
The anterior legs, when stretched backwards against the side, reach about two- thirds 
towards the thigh ; and the posterior when stretched forwards, extend to the shoulder. 
DIMENSIONS. 
Inches. Lines. 
Length of the head 0 5 
of the body 1 6 
of the tail 3 4 
Total length .... 5 5 
Length of anterior extremities 0 8 
O 
of posterior extremities 1 2 
It is at first sight extremely difficult to distinguish this species from younger 
individuals of Pr. Fitzingerii, from which, however, it differs in the more linear 
form of the supralabial scales, in the absence of imbricated scales on the lateral 
fold of the neck, the more entire margin of the ear. In the existence of a patch 
of larger imbricated scales on the posterior surface of the thighs, it resembles 
Pr. Weigmannii; from which, however, it may be at once distinguished by the 
single row of supralabial scales, the later species having a double row. 
Proctotretus Weigmannii. 
Plate VIII. — Fig. 1, 2. 
Capite squamis Icevihus non imhricatis tecto; auribus I'otundis margine anteriore 
