27. TROPIDURUS. 171 
27. TROPIDURUS. 
Tropidurus, Wied, Abbild. Nat. Bras.; Fitzing. Syst. Rept. p. 71; 
Peters, Mon. Berl. Ac. 1871, p. 644. 
Tropidurus, part., Fitzing. N. Classif. Rept. p. 17; Wagler, Syst. 
Amph. p. 146; Wiegm. Herp. Mex. p. 18. 
Ecphymotes (non Fitz.), Cuv. R. A. 2nd ed. ii. p. 47; Dum. & Bibr. 
iv. p. 842. 
Platynotus, Wagler, J. c. 
Microlophus, Dum. & Bibr. p. 884; Gray, Cat. Liz. p. 221; Peters, 
le 
? Tropidogaster, Dum. § Bibr. p. 329; Gray, lc. p. 227. 
Steirolepis, Fitzing. 1.c. p. 72. 
? Tritropis, Fitzing. 1. c. p. 59. 
Taraguira, Gray, lc. p. 219. 
Eulophus, Tschudi, Faun. Per., Herp. p. 25. 
Craniopeltis, Peters, 1. ¢. p. 645. 
Lemopristus, Peters, 1. ¢. 
Aneuporus, Bocourt, Miss. Sc. Mex., Rept. p. 215. 
Tympanum distinct. Body more or less compressed or depressed, 
without or with a more or less developed dorsal crest. Dorsal scales 
uniform. Upper head-scales enlarged, occipital very large. A 
strong curved or oblique fold on each side in front of the shoulder, 
not extending across the throat; frequently a transverse fold in 
front of the latter; no gular sac. Digits compressed, with keeled 
lamellee inferiorly. No femoral or preanal pores. Tail long, sub- 
cylindrical or compressed. Lateral teeth tricuspid; pterygoid teeth. 
A sternal fontanelle. No abdominal ribs. 
South America. 
Synopsis of the Species. 
I. Nostril above the canthus rostralis; ventral scales smooth. 
A. A dorsal denticulation or crest, distinct at least on the nape. 
1. Dorsal scales larger than ventrals. 
a. A strong oblique antehumeral fold, not meeting its fellow 
on the breast; no transverse gular fold. 
Dorsal scales more than twice as large 
ag ventrals 1.1... cee eee ees 1. grayi, p. 172. 
Dorsal scales little larger than ventrals .. 2. pacificus, p. 173. 
b. A transverse gular fold in front of the oblique ante- 
humeral fold. 
Scales on the snout keeled............ 3. occipitalis, p. 173. 
Scales on the snout smooth .......... 4, bocourti, p. 173. 
2. Dorsal scales not larger than ventrals. 
Dorsal scales smaller than ventrals; sides 
of neck uniformly granular ........ 5. peruvianus, p. 174. 
