165, IALTRIS, 137 
165, IALTRIS. 
Philodryas, part., Giinth. Cat. Col. Sn. p. 128 (1858). 
Taltris, Cope, Proc. Ac. Philad. 1862, p. 73. 
Maxillary teeth 14, increasing in size, the last large and fang- 
like and followed, after a considerable interspace, by a pair of 
large grooved fangs situated just behind the posterior border of the 
eye ; the five or six anterior mandibular teeth increasing in length 
and followed by a toothless space. Head distinct from neck, with 
distinct canthus rostralis; eye rather large, with round pupil. 
Body cylindrical; scales smooth, with apical pits, in 19 rows; 
ventrals rounded. Tail long; subcaudals in two rows. 
Santo Domingo. 
Maxillary and mandible of Jaltris dorsalis. 
1. Ialtris dorsalis. (Prare VII. fig. 2.) 
Philodryas dorsalis, Giinth. Cat. p. 126 (1858). 
Taltris vultuosa, Cope, Proc, Ac. Philad. 1862, p.73; Garm. Proce. 
Amer. Philos. Soc. xxiv. 1887, p. 284. 
Dromicus mentalis, Giinth, Ann. § Mag. N. H. (8) ix. 1862, p. 128, 
l. ix. fig. 9. 
Jaltris dorsalis, Cope, Proc. Amer, Philos. Soc. xviii. 1879, p. 273. 
Rostral nearly twice as broad as deep, scarcely visible from 
above; internasals as long as broad, nearly as long as the pre- 
frontals ; frontal once and two thirds to twice as long as broad, 
longer than its distance from the end of the snout, shorter than the 
parietals ; loreal a little longer than deep; one preocular, not 
reaching the frontal; two postoculars; temporals 1+2; seven 
upper labials, third and fourth entering the eye ; four lower labials in 
contact with the anterior chin-shields, which are much shorter than 
the posterior. Scalesin 19 rows. Ventrals 180-188 ; anal divided ; 
subcaudals 102-110. Olive above, with large black blotches 
anteriorly which may be wholly or partially confluent, posteriorly 
with small irregular light spots; yellowish beneath, speckled with 
olive, with or without small blackish spots, 
Total length 1090 millim. ; tail 350. 
Santo Domingo. 
a. 3 (V. 180; C. 102). S. Domingo. M. Sallé [C.]. (Type.) 
b. dg (V. 181; C. 110). ——? (Type of D. mentalis.) 
