98 IGUANIDE. 
6. POLYCHRUS. 
Polychrus, Cuv. R. A. ii. p. 40; Merrem. Tent. p. 48 3 Fitzing. N. 
Classif. Rept. p. 17; Wagl. Syst. Amph. p. 149; Wiegm. Herp. 
Mex. p. 16; Dum. § Bibr. iv. p. 63; Fitzing. Syst. Rept. p. 62; 
Gray, Cat. Liz. p.183 ; Bocow't, Miss. Se. Mex., Rept. p. 111. 
Ecphymotes, part., Fitzing. N. Classif. Rept. p. 17; Gray, Ll. c. 
p. 184, le 
Lemanctus, part., Dum. § Bibr. iv. p. 70. 
Ecphymatotes, Fitzing. Syst. Rept. p. 62. 
Spheerops, Gray, l. c. p, 183. 
Ecphymotes, part., Gray, 1. c. p. 184. 
Chaunolemus, Peters, Mon. Berl. Ac. 1869, p. 786. 
Tympanum distinct. Body compressed, covered with small scales ; 
no nuchal or dorsal crest. Head with enlarged scales. No trans- 
verse gular fold ; male with a small gular pouch. Digits compressed, 
with carinated lamelle inferiorly ; four large scales at the base of 
the claw; third and fourth toes equal. Jemoral pores present. 
Tail very long, round. Lateral teeth tricuspid; pterygoid teeth. 
No sternal fontanele. Abdominal ribs. 
Tropical America. 
Synopsis of the Species. 
Ventral scales wunicarinate ; a serrated 
ridge in front of the throat .......... 1. marmoratus, p. 98. 
Ventral scales unicarinate; lateral scales 
larger than median dorsals .......... 2. acutirostris, p. 99. 
Ventral scales multicarinate, smaller than 
the.gulars: sccqeensie daca dd week ences 3. gutturosus, p. 100. 
1. Polychrus marmoratus. 
Polychrus marmoratus, Gray, Cat. p. 188. 
Lacerta marmorata, Linn. S. N. i. p. 368. 
Iguana marmorata, Latr. Rept. i. p. 265. 
Agama marmorata, Daud. Rept. ili. p. 433. 
Polychrus marmoratus, Merr. Tent. p. 48; Spix, Spec. Nov. Lacert. 
p. 14, pl. xiv.; Guér. Icon. R. A., Rept. pl. xi. fig.38; Wied, Beitr. 
p. 110, and Abhild. ; Dum. § Bibr. p.65 ; Bocourt, Miss, Se. Mez., 
Rept. pl. xvii. fig. 6. 
——- virescens, (Wied) Wagler, Icon. Amph. pl. xii. 
strigiventris, Wagl. J. c. 
Snout obtusely pointed ; nostril equally distant from the orbit and 
the tip of the snout ; eye-opening small, smaller than the tympanum ; 
upper head-scales smooth or feebly granulate or striated, very large 
on the snout; regular supraorbital semicircles of large scales, separated 
by one row of scales; supraocular scales small; labials large, few ; 
mental with a median cleft posteriorly. Gular scales smooth or 
feebly keeled, smaller than ventrals, separated by granules on the 
gular pouch ; a median denticulation along the front half of the 
