226 COLUBRIDiE. 



Tropidonotus barouis-niiilleri, Ti-oschel, in Miill. Reis. Mexico, iii. 



p. 610 (1865). 

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



p. 386. 

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



JDugcs, La Naturaleza, (2) i. 1888, p. 130. 



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

 internasals as long as broad or longer, subtri angular, truncate in 

 front, as long as the pra^frontals ; 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. 



«-/• 6 (V. 159, 152, Mexico. 



154, 155; 0. 71, 67, 



62, 68), 2 (V. 150; 



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



C. 55). 

 g-i. S (V. 152; C. 66), Plateau of Mexico, P. Geddes, Esq. [P.]. 



5 (V. 150 ; C. 55), & near the city. 

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



k. $ (V. 140 ; C. 71). La Laguna, Juana- Dr. A. C. Buller [C.]. 



catlan, Jalisco, 



6500 feet. 

 l-m. $ (V. 148; C. 63) Colonia Brizuela, Dr. A. C. Buller [CI. 



6 yg. (V.153 ; C. 79). Hacienda El 



Rosario, Autlan, 



Jalisco. 

 n,o. c?(V.156, 156; C. Tehuantepec. 



66, 66). 

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



26. Tropidonotus laevissimus. 



Natrix Lnevissima, Gunth. Ann. Sf Mag. N. II. (3) ix. 1862, p. 124, 



pi. ix. fig. 4. 

 Neusterophis laevissima, Giinth. Froc. Zool. Soc. 1863, p. 16. 



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



