144 ON LIZARDS FROM THE MUSEUM OF HALLE. [Mar. 19, 



lamellae. Head covered with large granules anteriorly, posteriorly 

 with minute granules intermixed with round tubercles ; rostral 

 quadrangular, nearly twice as broad as long, with median cleft 

 above : nostril pierced between the rostral, the first labial, and 

 three nasals ; eight or nine upper and six lower labials ; mental 

 trapezoid, followed by three transverse series on enlarged flat granules. 

 Body covered above with small granules and large trihedral tuber- 

 cles, which are about as broad as long, and form sixteen longitudinal 

 series. Abdominal scales large, cycloid, imbricate, smooth, in sixteen 

 longitudinal series in the middle of the body. No femoral or prae- 

 anal pores. Tail cylindrical, with rings of large keeled tubercles. 

 Pale brown above, with seven darker transverse bands separated by 

 narrow interspaces ; a dark band on each side of the head, from the 

 nostril, through the eye, to above the ear; tail with five dark-brown 

 cross bands ; lower surfaces white. 



millim. 



From snout to vent 15 



Head 17 



Width of head 10 



Fore limb 19 



Hind limb 27 



Tail .59 



A single male specimen from Mendoza. 



Closely allied to G.fasciatus, but differing in the larger granules 

 on the forehead, the larger ventral scales, and the absence of regular 

 chin-shields. 



6. Urostrophus scapulatus. (Plate XV. fig. 2.) 



Leiosaurus scapulatus, Burmeister, Reise La Plata, ii. p. .522 ( cJ). 



Leiosuurus multipunctatus, Burm., ibid. p. 524 ( $ ). 



Leiosaurus marmoratus, Burm., ibid. p. 524 (young). 



Head once and two fifths as long as broad; snout rounded, with 

 very short canthus rostralis ; nostril nearer the end of the snout 

 than the orbit ; tympanum oval, larger than the eye-opening ; upper 

 head-scales smooth, smallest on the supraorbital region, in two or 

 three series between the orbits ; occipital not enlarged ; a series of 

 enlarged infraorbitals, second largest ; eleven upper and as many 

 lower labials. Gular scales small and granular, enlarged and flat 

 near the labials and in front of the gular fold. Body subcylindrical ; 

 scales on upper surface very small, granular, of lower surfaces flat, 

 slightly imbricate, all smooth. The adpressed hind limb reaches 

 the ear in the male, the gular fold in the female. Tail as long as or 

 shghtly longer than head and body, not curly, covered with verticils 

 of small, squarish, smooth scales. Pale olive above, uniform in the 

 male, black-spotted in the female and young ; tail with more or less 

 distinct darker rings ; lower surfaces whitish, throat of female spotted 

 with black ; a black vertical bar in front of the shoulder. 



