187. XENOPHOLIs. 231 
c. No well-defined markings, 
e-f. 6 (V.170; C.38) Yucatan. 
& 2 (V.173; C. 28). : 
g. & (V. 162; C. 38). Tapana, Tehuan- M. Sumichrast [C.]; 
tepec. F. D. Godman & 
7. eit Esqrs. 
A 
h. f (V.171; C. 36). Cartago, Costa Rica. 
t. 6 (V. 151; C. 46). —? Prof. Grant [P.]. 
k. &, skeleton. Yucatan. 
187. XENOPHOLIS. 
Xenopholis, Peters, Mon. Berl. Ac. 1869, p. 440. 
Gerrhosteus, Cope, Proc. Ac. Philad. 1874, p. 71. 
Hlaposeeh anes part., Strauch, Bull. Ac. St. Pétersb. xxix. 1884, 
p. 549. 
Maxillary teeth 14, small, followed after a short interspace by a 
pair of moderately enlarged, grooved fangs situated just behind the 
vertical of the eye; mandibular teeth subequal. Head slightly 
Fig. 16. 
Vertebrae of Xenopholis scalaris. 
a. Four middle dorsal vertebrze, seen from above. _ 
b. Middle dorsal vertebrx, lower view. c. Ditto, front view. 
distinct from neck ; eye rather small, with round pupil ; nasal entire ; 
preefrontals fused to a single shield. Body cylindrical ; scales smooth, 
without pits, in 17 rows; ventrals rounded. Tail rather short ; 
_ subcaudals in two rows. Neural spines of the vertebra expanded 
above, forming shields which are rugose and divided by a median 
groove. 
South America. 
