226 



COLUBKIDiB. 



Tropidonotus baronis-muUeri, .Troschel, in Miill. Reis. Mexico, iii. 



p. 610 (1865). 

 Eutesnia melanogaster, Cope, Proc. Am. Philos. Soc. xxii. 1885, 



p. 386. 

 Eegina mesomelana, Cope, Bull. U.S. Nat. Mus. no. 32, p. 74 (1887) ; 



I)uges, La Naturaleza, (2) i. 1888, p. 130. 



Eye rather small. Eostral broader than deep, visible from above ; 

 internasals as long as broad or longer, subtriangular, truncate in 

 front, as long as tlie prsefrontals ; frontal once and two thirds to 

 twice as long as broad, as long as or longer than its distance from 

 the end of the snout, a little shorter than the parietals; loreal 

 longer than deep ; two (rarely three) prse- and two or three (rarely 

 four) postoculars; temporals 1 + 2 or 1 + 3; eight upper labials, 

 fourth and fifth entering the eye ; five (rarely four) lower labials in 

 contact with the anterior chin-shields, which are shorter than the 

 posterior. Scales in 19 rows, strongly keeled, outer row perfectly 

 smooth or faintly keeled, second smooth or feebly keeled. Ventrals 

 140-159; anal entire; subcaudals 45-79. Olive-brown above, 

 without or with very small black spots ; a more or less distinct pale 

 lateral stripe running along the second or second and third rows of 

 scales ; throat yellowish ; belly and lower surface of tail black in 

 the middle, olive or plumbeous on the sides, or pale greyish with a 

 median series of more or less confluent small black spots. 



Total length 580 millim. ; tail 140. 



Mexico. 



a-f. 6 (V. 159, 152, Mexico. 

 154, 155; 0. 71, 67, 

 62, 68), 2 (V. 150; 

 C.55),&hgr. (V.152; 

 C. 55). 

 jf-i". (? (V. 152 ; C. 66), Plateau of Mexico, P. Geddes, Esq. [P.]. 

 2 (V. 150 ; 0. 55), & near the city, 



yg. (V. 149; 0. 64). 

 h. $(V.140; C. 71). La Laguna, Juana- Dr. A. 0. BuUer [C.]. 



catlan, Jalisco, 

 6600 feet. 

 l-m. 2 (V. 148 ; C. 63) Colonia Brizuela, Dr. A. 0. Duller [C.]. 

 & yg. (V.153; 0. 79). Hacienda El 



Rosario, Autlan, 

 Jalisco. 

 n, 0. <5 (V. 156, 156 ; C. Tehuantepec. 



66, 66). 

 p. Yg. (V. 142; 0. 66). W. Mexico. 



26. Tropidonotus Isevissimus. 



Natrix Isevissima, Giinth. Ann. ^ Mag. N. H. (3) ix. 1862, p. 124, 



pi. ix. fig. 4. 

 NeusteropMs laevissima, Giinth. Proc. Zool. Soc. 1863, p. 16. 



Eye rather small. Eostral broader than deep, just visible from 



