LIZARDS. 211 



Dark olive, with pale edges to the scales, and a black keel ; 

 head blackish-dotted ; beneath yellowish olive or dark green bron- 

 zed ; scales of the back large, rhombic, elongate, acutely keeled, 

 dagger-pointed ; scales of the sides of the neck large, and si- 

 milar to those of the back, of the tail smaller, of the lower side of 

 the base narrow, smooth ; ears with 2 conical scales below, and a 

 broad concave one above, in front ; tail round, or slightly polyhe- 

 dral at the end, tapering. 



a. Stuffed. N. Chili, Guasco. From M. Bibron's collection. 



b — d. In spirits. Tail broken or reproduced. N. Chili, Guasco. 



e,f. In spirits, e. Tail reproduced and forked. N. Chili. Present- 

 ed by Charles Darwin, Esq. 



g. Young? or var., in spirits. Pale brown, with scattered black 

 spots on the back. Chili. Presented by J. E. Gray, Esq. 



Gravenhorst's Leiodera. Leiodera Gravenhorstii. 



Pale olive with bluish reflections ; back black-varied, generally 

 with a broad central and narrow lateral black streaks ; beneath, 

 greenish bronzed ; head dark olive, black varied ; scales of the 

 back very large, rhomboid, strongly keeled, dagger-pointed, of the 

 sides of neck and nape rather smaller, of the sides larger, nearly 

 smooth, of the tail very large, of the under side of the base of the 

 tail rhombic, and a little way further on, distinctly keeled ; tail 6 

 or 10 angular at the end, from the ridges of the keels of the scales; 

 ears with several small scales in front. 



a, b. Adult, in spirits. Chili. From Mr. Cuming's collection. 



c, d. Young. Pale olive, with 7 broad dark streaks. From Mr. 

 Cuming's collection. 



e,f. Young, in spirits. Pale brown, with interrupted black bands, 

 tail with 3 brown streaks. Chili. Presented by Charles Dar- 

 win, Esq. 



Proct. Chileusis, var. Bell^ MSS. 



The Slender Leiodera. Leiodera gracilis. Proctotretus 

 gracilis. Bell, Zool. Beagle, Rept. 4, t. l,f. 2. 



Olive, with 2 pale streaks on each side ; slender ; front edge 

 of the ears minutely 2 or 3 toothed ; scales imbricate ; of the back 

 small, rhomboidal, flat, with a low keel, not pointed at the tip ; 

 of the sides of the throat uniform and similar but rather smaller ; 

 of tail more pointed. 



a. In spirits. Patagonia, Port Desire. Presented by C. Dar- 



win, Esq. 



b. In spirits. Valparaiso. Presented by C. Darwin, Esq. 



See also Proctotrepe mosaique, H. et J. Vog. a Pol Sud, t. 2, 

 /. 1 , not described. 



