7. CALLOPISTES. S. UICRODON. 377 



More slender, resembling a Varanus. Vertex with numerous 

 small plates, similar to those on the snout ; a few slightly enlarged 

 supraocular plates, separated from the plates on the vertex by two 

 or three rows of granules; lorcal plates small, numerous, irregular; 

 two rows of small scales between the labials and the infraorbitals. 

 Dorsal scales granular, oval. Blackish-brown above, dotted with 

 yellow ; lower surfaces yellow, the throat marbled, and the belly 

 more or less irregularly spotted with brown. 



millim. millim. 



Total length 925 Fore limb 100 



Head 70 Hind limb 172 



Body 180 Tail 630 



Peru. 



8. DICRODON. 

 Dicrodon, Du7n. (§• Bibr. v. p. 137 ; Grar/, Cat. p. 23. 



Tongue moderately elongate, not retractile, widened and emargi- 

 nate posteriorly. Lateral teeth compressed transversely, bicuspid. 

 Head with large regular shields ; nostril pierced in the anterior 

 nasiil. Eyelids developed. Ear exposed. Limbs well developed, 

 each with five digits. Dorsal scales small ; ventral plates large, 

 subquadraugular, smooth, forming regular series. A double collar- 

 fold. Femoral pores. Tail cyclotetragoual. 



Peru. 



1. Dicrodon giittulatum. 



Dicrodon guttulatum, Gray, Cat. p. 23. 

 Dicrodon guttulatum, Bum. i!)- Bihr. v. p. 138. 



A single frontoparietal shield, followed by numerous smaU shields ; 

 the anterior head-shields as in the Ameivce; eight upper and six 

 lower Jabials ; chin-shields one anterior and three large pairs, which 

 are followed by smaller ones ; gular scales hexagonal, smooth, 

 smallest between the chin-shields ; mesoptychial scales imbricate, 

 hardly larger than the largest gulars. A row of large transversely 

 dilated brachial plates, followed by other smaller ones ; a row of 

 similar large antebrachials. Six series of femoral plates ; three 

 rows of tibial plates, outer largest. Femoral pores ten. Several 

 large, angular, imbricate x^raianal plates. Caudal scales elongate, 

 quadrangular, keeled. Olive above, the back and sides with round 

 whitish or yellowish spots ; on each side two feebly marked yellowish 

 longitudinal lines, the upper extending from the supraciliaries to the 

 tail, the lower from the shoulder to the hind limb ; a yellow, black- 

 edged band along the hinder side of the thigh ; belly and lower 

 surface of limbs and tail white ; throat, chest, and sides of the belly 

 bluish grey. 



millim. millim. 



Total length 450 Fore limb 45 



Head 29 Hind limb 85 



Body 101 Tail 320 



Peru. 



