128 F. Stoliczka — On Indian Lizards. [No. 2, 



one type species, but unless direct transitions, or transmutations, from one form 

 into the other had been proved by observations, we have no right to ignore the 

 distinctions which had been pointed out, and which do in reality exist. 



M. SikJcimensis appears to be, however, more closely related to Mocoa 

 Schlegelii, Giinther (1. c, p. 86), which also has been described from a Sik- 

 kim specimen. In size, form and general structure there does not appear to 

 be a great difference between the two ; the number of longitudinal rows of 

 scales round the body is given as 25, and that between the axil and groin 

 as 35, the latter number is, however, too small for Sikkimensis. The colour 

 of Scldegelii is said to be black above, blackish below, which I certainly 

 never observed among a few hundreds of Sihhvniensis. 



Mocoa sacka, n. sp.* 



PL iv, fig. 4, side view of the animal, natural size ; 4a, 4b, 4c, upper, side, and lower 

 views of the head and neck, enlarged. 



Habit slender, head somewhat depressed, obtuse in front, body shorter 

 than the tail, the latter gradually tapering to a point. No supranasals, eyelid 

 with a perfectly transparent disc ; scales in 22 longitudinal series round the 

 middle of the body, and in 40 transverse series between fore and Mnd-limb. 

 Head shields regular, like in SiTcJcimensis, but the postnasal scarcely reaches 

 the top of head, and the fifth upper labial is comparatively longer than in 

 that species. A few enlarged scales behind the occipitals. Subcaudals single, 

 enlarged, except the two first pairs. A pair of large preanals. Ear in front 

 denticulated with three equal lobules. 



Total length 3.37 inches of which the tail is 2" ; feet slender ; the fore foot 

 reaches to the middle of the eye, when laid forward, the 3rd and 4th fingers are 

 equal or subequal ; the hind foot is two-third the distance between fore 

 and hind limb, or half that between the latter and the ear ; the 4th toe is 

 slightly longer than the 3rd. 



Above, fight iridescent bronze brown, with a few dark brown spots 

 scattered on the head and body, each of these dark spots being accompanied 

 by an indistinct pale spot, on both, or only on one side ; a narrow black band 

 from the rostral through the eye, passing above the ear and becoming 

 indistinct on the sides of the belly ; a white band below the black, best marked 

 through the ear and above the fore foot, but becoming also indistinct on 

 the belly where a few whitish spots separate the lower fight from the upper 

 darker parts ; labials somewhat spotted with dark ; chin white ; breast and 

 belly, below, greenish iridescent white ; femoral region and tail below pale 

 vermihon, that colour passing also on the sides of the tail, where only a few 

 indistinct pale spots exist. 



This species is very closely allied to SiJchimensis, differing from it by 

 its more slender and comparatively longer hind feet, smaller number of 

 * See Proc. A. S. B., September 1871, p. 195. 



