108 OPHIDIA. 
1+2. Anterior and posterior.chin-shields subequal in length, the anterior in contact 
with five lower labials. Ventrals 139-149; anal divided; subcaudals 54-60. Dentition 
diacranterian. Greyish olive, shading into black on the posterior part of the body ; 
anterior part of the body with black cross-bands, which soon become so broad as to be 
uearly confluent. The scales of the intervening spaces have a white margin, and as the 
interspaces on the middle and posterior parts of the body are exceedingly narrow, the 
white margins form irregular and interrupted transverse lines. A black stripe is_ 
generally visible along the side of the tail; abdomen irregularly chequered with black ; 
lower part of the tail white. 
An adult female is 24 inches long, the tail measuring 53 inches. 
2. Liophis regalis. 
Diadophis regalis, Baird & Gir. N. Amer. Serp. pp. 115, 161, and Pacif. R. R. Report, Rept. t. 33. 
fig. 86; Garman, Mem. Mus. Comp. Zool. viii. no. 3, p. 73 (1888). 
Diadophis punctatus, subsp. regalis, Cope, Bull. U. 8. Nat. Mus. no. 32, p. 80. 
Hab. Mexico, Sonora (B. & G.), San Luis Potosi (Garman). 
The dentition of this snake has not been described, and as I have not seen a 
specimen, I cannot be certain about its position in Liophis. 
8. Liophis letus. 
Diadophis punctatus, var. letus, Jan, Iconogr. Ophid. xv. t. 6. fig. 6; Bocourt, Miss. Se. Mex., 
Rept. p. 622, t. 40. figg. 4, 4 a—e. 
Liophis (Diadophis) arnyi, Giinth. Ann. & Mag. N. H. 1868, i. p. 413 (not Kennicott). 
Diadophis punctatus, var. dugesii, Villada, La Naturaleza, iii. p. 226, c. fig. (1875). 
Diadophis punctatus, subsp. arnyi, Cope, Bull. U. S. Nat. Mus. no. 82, p. 80. 
Hab. Mexico, City of Mexico (Doorman), Mirador, Vera Cruz (Cope), Guanajuato 
(Villada), Zacualtipan (Cope). 
I think that this snake should be, at least, specifically separated from Diadophis 
punctatus, having the dentition of a most marked diacranterian character, as is also 
well described by Villada. What the dentition of the more northern form, named 
arnyi, may be, I have no means of ascertaining ; possibly it is the same as in the typical 
D. punctatus, in which the last tooth is scarcely larger than the preceding, though 
both are separated by a short space. However, L. arnyt has much fewer ventral shields 
(160); whilst Z. detus has 183-184, and according to Villada even 202. 
CORONELLA. 
Coronella, sp., Laur. Syn. Rept. p. 84 (1768). 
We include in this genus only those species of Cope’s Rhadinwa which possess a 
syncranterian or coryphodont dentition. 
