28 LACERTILIA. 
5. Cnemidophorus mariarum. (Tab. XX.) 
Hab. Mexico, Tres Marias Islands (Forrer). 
Abdominal scutes in eight longitudinal and in thirty-eight transverse series. Scales 
of the middle of the throat but little larger than the others. Collar covered by three 
or four series of enlarged scales. Nostril in one scute. Snout narrow and long in 
adult specimens, and comparatively shorter in young ones. Loreal with the postero- 
inferior angle detached. Supraorbitals four; temporal scales granular; scales of the 
body unusually small; the scales of the tail with a rather weak keel, which runs nearly 
parallel to the lateral margins of the scale. Humeral scutes in five or six longitudinal 
series, separated from the pectoral scutes by a granular fold; femoral scutes in ten or 
twelve series. Femoral pores twenty-one. ‘Three preanals. 
The young have six narrow whitish lines, of which the dorsal pair are very faint ; 
the two outer lines take their origin from behind the eye, and are separated by 
a blackish band; the lower parts are uniform white. In very large specimens 
(44 inches long, without tail) the bands have nearly disappeared, the sides being 
coarsely marbled with greenish-white and black; upper side of the hind legs with 
round greyish-white spots; lower parts nearly uniform black, or black marbled with 
ereenish-white. 
Herr Forrer brought five specimens of different sizes and ages. 
6. Cnemidophorus guttatus. (Tab. XXI.) 
Cnemidophorus guttatus, Wiegm. Herpet. Mex. p. 29; Peters, Berl. MB. 1869, p. 62. 
Cnemidophorus microlepidopus, Cope, Proc. Amer. Phil. Soc. xvii. 1877, p. 93; Sumichrast, Bull. 
Soc. Zool. Fr. 1880, p. 177. 
Cnemidophorus unicolor, Cope, 1. c.; Sumichrast, 1. ¢. 
Hab. Mexico, Tehuantepec and Huamelula (Sumichrast), Vera Cruz (rit. Mus.). 
Abdominal scutes in eight series; scales of the middle of the throat somewhat 
enlarged, and gradually passing into the small lateral scales. Collar covered by three 
or four series of enlarged scales. Nostril in one scute; supraorbitals three. Humeral 
scutes in three or four longitudinal series, separated by a narrow granular fold from the 
pectoral scutes; three large preanals. The scales of the tail are strongly keeled, the 
keels not projecting behind, and having a subdiagonal direction. Young specimens 
have the lines of the body very indistinct, but there is generally a white line running 
along the middle of the posterior side of the thigh, and continued along the side of 
the tail. They have also frequently four spots on the edge of the ear-opening, and 
one or two others between the ear and the eye. In old specimens the longitudinal 
lines may disappear altogether, or be indicated by series of white spots only. 
