160. TomoDoNn. 121 
Head distinct from neck ; eye moderate, with round pupil; nasal 
entire or semidivided. Body cylindrical ; scales oblique, smooth, 
with apical pits, in 17 or 19 rows; ventralsrounded. Tail sponenese 
or short ; subcaudals in two rows. 
South "America, 
Maxillary and mandible of Zomodon ocellatus. 
1. Tomodon dorsatus. 
“Tomodon dorsatum, Dum. § Bibr. vii. p. 934 (1854) ; Giinth. Cat. 
53 (1858) ; Jan, Arch. Zool. Anat. neve ii. 1862, p. 323, and 
bh Gén. 19, pl. vi. fig. 1 (1866). 
Opisthoplus degener, Peters, Sitzb. Ak, Berl. 1889 2, p. 1149, fig. 
Snout short, very convex. Rostral broader than deep, just visible 
-from above ; internasals as long as or a little shorter than the pre- 
frontals ; frontal once and one third to once and two thirds as long 
as broad, longer than its distance from the end of the snout, shorter 
than the parietals ; no loreal; nasal elongate and in contact with 
-the preocular, which is single ; two or three postoculars ; temporals 
‘142; seven (exceptionally six) upper labials, third and fourth (or 
second and third) entering the eye; chin-shields short, the anterior 
in contact with four or five lower labials. Scales in 17 rows. 
Ventrals 134-143; anal divided; subcaudals 53-62. Brown or 
olive above, with a yellow vertebral stripe which may be confined 
to the nape; small blackish spots may be present on the back; an 
oblique dark streak from the eye to the angle of the mouth; 
.yellowish or pale olive beneath, uniform or speckled with darker. 
Total length 610 millim.; tail 150. 
Brazil. 
a. 3 (V.136; C. 62). Rio Janeiro. A. Fry, Esq. [P.]. 
b-c. § (V.139; C.?) & Rio Grande do Sul. Dr. H. v. Ihering [C.]. 
her. (V. 184; C. 53). 
2. Tomodon ocellatus. 
Tomodon ocellatum, Dum. § Bibr. vii. p. 938 (1854) ; Jan, Arch. 
Zool, Anat. Phys. ii. 1862, p. 323, and Icon. Gén. 19, pl. vi. fig. 2 
(1866). 
Snout short, very convex. Rostral broader than deep, just visible 
from above; internasals a little shorter than the prefrontals ; frontal 
once and two thirds to twice as long as broad, longer than its distance 
, from the end of the snout, as long as the parietals; nasal entire or 
* semidivided ; loreal as long as deep or deeper than long; one pre- 
