160. TOMonoN. 121 



Head distinct from neck ; eye moderate, with round pupil ; nasal 

 efltire or semidivided. Body cj'lindrical ; scales oblique, smooth, 

 with apical pits, in 17 or 19 rows ; ventrals rounded. Tail moderate 

 X)T short ; subcaudals in two rows. 

 South America, 



Maxillary and mandible of Tomodon ocellatns. 



1. Tomodon dorsatus. 



Tomodon dorsatum, Bum. Sr Bibr. vii. p. 934 (1854) ; Gimth. Cat. 



p, 53 (1858) ; Jan, Arch. Zool. Anat. Phys. ii. 1862, p. 323, and 



Icon. GH. 19, pi. vi. fig. 1 (1866). 

 Opisthoplus degener, Peters, Sitzb. Ak. Berl. 1882, p. 1149, fig. 



Snout short, very convex. Rostral broader than deep, just visible 

 fi-om above ; internasals as long as or a little shorter than the prse- 

 .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 praeooular, which is single ; two or three postoculars ; temporals 

 1+2; 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. S (V. 136 ; 0. 62). Rio Janeiro. A. Fry. Esq. [P.l 



b-c. d (V. 139 ; C. ?) & Rio Grande do Sul. Dr. H. v. Ihering [0.]. 

 hgr. (V. 184; 0. 63). 



2. Tomodon ocellatns. 



Tomodon ocellatum, Dum. S/- Bibr. vii. p. 938 (1854) ; Jan, Arch. 

 Zool. Anat. Phys. ii. 1862, p. 323, and Icon. GSn. 19, pi. vi. fig. 2 

 (1866). 



Snout short, very convex. Rostral broader than deep, just visible 



" from above ; internasals a little shorter than the praefrontals ; 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 



fiemidivided ; loreal as long as deep or deeper than long ; one prse- 



L 



^^ 



