7. CALLOPISTEs.—8. DICRODON. 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; loreal 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 
CAL Ss eatiiee Pst asa 70 Hind limb........ L72 
Body cise Bee ees 180 Walls sat aed ate ais 630 
Peru 
8. DICRODON. 
Dicrodon, Dum. § Bibr. vy. p. 187; Gray, Cat. p. 23. 
Tongue moderately elongate, not retractile, widened and emargi- 
nate posteriorly. Lateral teeth compressed transversely, bicuspid. 
Head with large regular shiclds; nostril pierced in the anterior 
nasal. Eyelids developed. Ear exposed. Limbs well developed, 
each with five digits. Dorsal scales small; ventral plates large. 
subquadrangular, smooth, forming regular series. A double collar- 
fold. Femoral pores. Tail cyclotetragonal. 
Peru. 
1. Dicrodon guttulatum. 
Dicrodon guttulatum, Gray, Cat. p. 23. 
Dicrodon guttulatum, Dum. § Bibr. v. p. 188. 
A single frontoparietal shield, followed by numerous small shields ; 
the anterior head-shields as in the Amewe; eight upper and six 
lower labials ; 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 preanal 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 oo. cne esas 29 Hind limb ...... 85 
Body .. ....++-- 101 Hail ieee tar oaiaiee 320 
