96. ARRHYTON. 251 
Snout shorter than in JL. torquatus; upper portion of rostral as 
long as its distance from the frontal; prefrontal separated from the 
eye by asmall preocular. Scales in 17 rows. Ventrals 191; sub- 
caudals 93. Uniform grey-brown above, yellowish white beneath. 
Total length 346 millim.; tail 105. 
Isthmus of Tehuantepec. 
3. Leptocalamus sclateri. (Prare XII. fig. 1.) 
Rostral smaller than in ZL. torquatus, nearly twice as broad as 
deep, the portion visible from above measuring about one third its 
distance from the frontal; internasals shorter than the preefrontals, 
which largely enter the eyes; frontal large, kite-shaped, slightly 
longer than broad, much longer than its distance from the end of 
the snout, as long as the parietals; supraocular very small; loreal 
longer than the nasals; no preocular; two postoculars ; temporals 
1+2; seven upper labials, third and fourth entering the eye; five 
small equal chin-shields, the anterior a pair in contact with three 
labials. Scales in 15 rows. Ventrals 144; anal divided; sub- 
caudals 98. Uniform dark brown above ; head yellow, with a black 
blotch on the snout and another round each eye; lower parts uni- 
form yellowish. 
Total length 380 millim.; tail 150. 
S. America. 
a. 9 (V. 144; C. 98). S. America. P. L. Sclater, Esq [P.]. 
96. ARRHYTON. 
Arrhyton, Giinth. Cat. Col. Sn. p. 244 (1858). 
Cryptodacus, Gundl. § Peters, Mon. Berl. Ac, 1861, p. 1002; Bocourt, 
Miss. Sc. Mex., Rept. p. 560 (1883). 
Colorhogia, Cope, Proc. Ac. Philad. 1862, p. 81. 
Maxillary bone short, with 8 small teeth, followed, after a con- 
siderable interspace, by a strongly enlarged fang; palatine and 
pterygoid teeth few ; mandibular teeth small, equal. Head slightly 
distinct from neck; eye rather small, with round pupil; nasal 
entire orsemidivided. Body cylindrical, moderately elongate ; scales 
smooth, without apical pits, in 15 or 17 rows; ventrals rounded. 
Tail moderate ; subcaudals in two rows. 
Cuba, 
Synopsis of the Species. 
Nasal semidivided ; prefrontals distinct, in 
combacy with: labrals y's. sls doce os wen 1. teniatum, p. 252. 
Nasal entire; prefrontals and loreal distinct. 2. vittatum, p. 252. 
Nasal entire; prefrontals coalesced ; loreal 
Gaptinet 265 ise. to OR i Bene eee 3. redimitum, p. 252. 
