118 IGUANIDZ. 
Nostril considerably nearer the tip of the 
snout than the orbit; tibia nearly as long * 
as the head; ventral scales nearly smooth 2. bibroniz, p. 119. 
Nostril nearly equally distant from the orbit 
and the tip of the snout; tibia shorter 
than the head; ventral scales strongly 
keeled. seunwdan ddaw sane chee 3. iheringit, p. 120. 
Nostril nearer the orbit than the tip of the 
snout; ventral scales keeled.........- 4, ccerulescens, p. 120. 
II. Lateral scales sharply keeled, very much smaller than those of 
the middle of the back. 
Sides with large black vertical spots, sepa- 
rated from the vertebral zone by a light 
longitudinel band; belly with white and : 
brown longitudinal bands ...........- 5. fitzingert, p. 121. 
Brownish or olive, spotted with black, or 
with two wavy blackish lateral bands .. 6. undulatus, p. 121. 
1. Enyalius catenatus. 
Enyalius rhombifer, Gray, Cat. p. 195. : 
Agama catenata, Wied, Reisen. Bras. ii. p. 247, and Abbild. — 
Lophyrus rhombifer, Spr, Spec. Nov. Lacert. Bras. p. 9, pl. Xi. 
margaritaceus, Spir, 1. c. p. 10, pl. xii. fig. 1. 
— albomaxillaris, Spex, J. c. p. 11, pl. xiii. fig. 2. 
brasiliensis, Less. § Garn. Voy, Coquille, Rept. pl. i. fig. 3. 
Uraniscodon rhombifer, Kap, Isis, 1826, p. 90. 
margaritaceus, Kaup, 1. c. i 
catenata, Kaup, l. c. p. 91. 
Ophryoessa catenata, Fitsing. N. Class, Rept. p. 48; Peters, Mon. 
Berl, Ac. 1877, p. 407. 4 
—— margaritacea, Fitzing. 1. ce. x 
Enyalius rhombifer, Wagl. Syst. Amph. p. 150; Guichen. in Casteln. 
Amér, Mér., Rept. p. 19. 
Ophyessa rhombifer, Gray, Griff. A. K. ix. Syn. p. 40. 
brasiliensis, Gray, l. ¢. 
Hypsibatus (Enyalius) catenatus, Fitzing. Syst. Rept. p. 57. 
(Enyalius) margaritaceus, Fitzing. l. c. p. 58. 
Enyalius bilineatus, part., 4. Dum. Cat. Méth. Rept. p. 64. 
Head moderately large, longer than broad; snout short, as long 
as or a little shorter than the diameter of the orbit; canthus ros- 
tralis angular; nostril nearer the tip of the snout than the orbit; 
eye large; tympanum large, vertically oval. Upper head-scales 
small, smooth or feebly keeled; occipital scarcely enlarged ; supra~- 
ocular scales either all very minute or with three or four longitudinal 
rows of larger ones; ten or eleven upper and as many lower labials. 
Gular scales small, granular, enlarged and keeled on the sides near 
the jaws, and in front of the gular fold. Nape and back with a 
series of oval keeled scales, forming a more or less marked denti- 
culation. Dorsal scales very small, granular, smooth, smallest on 
