4, monoPLocus.—5. AMEIVA. 343 
transverse rows. Two rows of keeled collar scales, the second 
largest. Gular scales small, equal, smooth. Bluish, with a median 
light band from the middle of the back to the end of the nose, 
covering the muzzle and front as far as the frontoparietal scuta; a 
light band from orbit to near femur and another from tympanum to 
groin, the intervening space crossed by vertical black spots and bars ; 
lower surfaces green. 
This species is established on a single, young, specimen measuring 
40 millim. from snout to vent. 
Moyobamba, Peru. 
4, MONOPLOCUS. 
Monoplocus, Giinth. Proc. Zool. Soc, 1859, p. 404. 
* Tongue elongate, free, not sheathed, terminating in two very 
fine points. Palatine teeth none; the posterior teeth in the jaws 
bi- or tricuspid. Tympanum distinct. Throat with a single fold. 
Scales of the back exceedingly small, those of the sides granular: 
gular and ventral shields keeled. Tail rounded, covered with keeled 
aud verticillated scales of moderate size. Femoral pores none.” 
1. Monoplocus dorsalis. 
Monoplocus dorsalis, Giinth. 1. ¢. 
This species has been identified with Centropywx pelviceps (cf. 
O’Shaughnessy, P. Z.8. 1881, p. 228), from the examination of a 
specimen labelled as the type of Monoplocus dorsahs. Although 
that specimen agrees pretty well in size, proportions, and coloration 
with Giinther’s detailed description, it differs in several points 
which certainly cannot be attributed to difference in the mode of 
describing or to oversight:—1. The tongue is distinctly sheathed 
at the base; 2. Femoral pores are as distinct as can be; 3. There 
aro fourteen instead of eleven rows of ventral shields: 4. The dorsal 
scales are not smooth and imbricate, but strongly keeled and juxta- 
posed, There is therefore no doubt that a young specimen of 
Centropysx pelviceps has been substituted in the bottle containing the 
original Monoplocus dorsalis, which has disappeared from the col- 
lection. 
W. Ecuador. 
5. AMEIVA. 
Ameiva, Cuv. Regne Anim. ii. p.27; Fitsing. N. Classif. Rept. p. 21; 
Dum. & Bibr. v. p.92; Gray, Cat. p.17; Cope, Proc. Ac. Philad. 
1862, p. 61; Bocourt, Miss. Sc. Mex., Rept. p. 250. 
Tejus, part., Merr, Tent. Syst. Amph. p. 60. 
Cnemidophorus, part., Wagler, Syst. Amph. p. 154; Wiegm. Herp. 
Mex. p. 9. 
Holcosus, Cope, /.c. p. 60. 
Tongue long, narrow, more or less retractile at the base. Lateral 
