184 CATALOGUE OF MEXICAN ANIMALS. 



95, 9G, December. Jalapa, Nos. 47, 85, December. — State of Chiapas. 

 Nos. 236, 248, 249, 250, 251, 254, 256, 257. 



7. Sibon frenatum, Cope, sp. nov, 

 Yulg. — Coralillo. 



Hab. — State of Vera Cruz. Jalapa, No. 298, type. 



[Scales in twenty-three longitudinal series. Body rather slender, tail 

 rather short, head very distinct and depressed. Superior labials nine, 

 eye resting on the fourth and fifth, and only separated from the third 

 by the small inferior preocular. All are higher than long, excepting the 

 eighth and ninth, which are longer than high; the sixth and seventh 

 are the largest. Inferior labials, eleven. Postgeneials much longer 

 than pregeueials. Loreal plate subquadrate; oculars, 2-2; the superior 

 anterior not reaching frontal plate. Temporals, 1-2-3. Frontal twice 

 as long as wide, with parallel sides. Occipitals moderate, reaching to 

 above middle of eighth superior labials. Gastrosteges, 188; anals, 1-1 ; 

 urosteges, 69. 



Colors: above black, below white. At distances of from six to nine 

 scales, narrow cross-bands of one scale in width rise from the abdom- 

 inal border color, and meet or terminate in alternating positions, on or 

 near the middle line of the back. These bands are more or less gray, 

 sometimes darker in the middle. The top of the head is gray, densely 

 mottled with blackish, leaving a crescentic space of light gray between 

 a black spot behind the head-shields and the beginning of the black of 

 the superior surfaces. Abroad black band passes downwards and pos- 

 teriorly from the eye, and crossing the angle of the mouth, covers the 

 side of the neck, and unites with the black of the following regions. 

 The superior labials are light-gray with black borders; the dark borders 

 of the inferior labials are less distinct. 



Total length, 305""; of tail, 66™"; of head to cauthus oris, 11""". 

 .IsTo. 298. Jalapa, Mexico. 



This species is nearest the 8. personatumCo^pe from Mazatlan, although 

 the coloration is very different. That species has but one preOcular, 

 eight superior labials, &c. — E. D. Cope.] 



8. Triniorphodon collaris Cope. 



Trimorpliodon collaris Cope, Jouru. Ac Phihul., 1875, p. 131. 



Vulg. — Culebra. 



Hah. — State of Puebla. Izucar de Matamoros, Ko. 56, November. 



9. Dipsas cenchoa (Linnaeus). 



Coluber cenchoa, Linnaeus, Syst. Nat., 1, 1758, \^. 226 ; 1, 1766, p. 389. 

 Dipsas cenchoa, Wied, Beitr., 1, 1825, p. 396. 



Vulg. — Miahuacuitlapitl. 



Hab. — State of Vera Cruz. San Jose Acatino, No. 302. 



