Dr, A. Giinther on new Reptiles and Fishes from Mexico. 443 
lary tooth longest and strongest, in a continuous series with the other 
teeth, not grooved. Dirty-white, with numerous black cross-bands 
extending on to the ventral plates ; belly uniform whitish. 
Hab, Oaxaca (Mexico). 
Description.—The head is rather broad and depressed, the snout 
rounded ; the eye is of moderate size, its vertical diameter being 
about one-third the width between the eyes; the trunk is rounded, 
and, like the tail, somewhat slender. ‘The rostral shield reaches 
just to the upper surface of the snout ; the frontals are nearly square: 
the anterior pair are one-third the size of the posterior, which are 
slightly bent downwards to the side of the head ; the vertical is pen- 
Serta longer than broad ; the occipitals rounded posteriorly, 
Nostril situated between two nasals; loreal quadrangular; one an- 
terior and two posterior oculars; seven or eight upper labial shields, 
the third and fourth or the fourth and fifth entering the orbit. There 
is one elongate temporal shield in contact with both the oculars ; the 
other temporals, five in number, are scale-like. The medial lower 
labial is triangular and rather small; nine lower labials, the first of 
which is in contact with its fellow behind the median shield. There 
are two pairs of chin-shields, of nearly equal size. The scales are in 
nineteen rows, smooth, rhombic, those of the sides similar to those 
on the back. The number of the ventral plates varies between 182 
and 179, that of the caudal between 88 an 87. 
The ground-colour of the upper parts is dirty-white: the upper 
part of the head is brown; there is a whitish pe ie behind the occi- 
pitals. Fifty-one or fifty-four black bands cross the trunk and ex- 
tend on to the edge of the belly ; they are broader than the inter- 
Spaces between, and become interrupted and spot-like on the tail. 
All the lower parts are uniform whitish. 
in. lin 
OS Ea I OSE a I aS. 21 1 
Length of the head ....5..2..¢.0000+00- Sa 
Greatest width of the head...>.......... 0 54 
Length of the trunk ............ pes 14 6 
od eg OT APIS em kee ta 6 0 
This species might be easily taken for a variety of Leptadeira an- 
nulata or Leptodeira torquata*, exhibiting nearly the same phy- 
siognomy, and externally differing only in its more slender body, 
fewer scales, and somewhat modified coloration. Nevertheless we 
should be obliged to refer these snakes to different genera, if we were 
to adopt the dentition as the chief systematic principle: namely, 
L. annulata to Dipsas, L. torquata to Liophis, and L. discolor to 
Coronella. 
PISCES. 
CHROMIS NEBULIFERA, sp. nov. 
D3 Avy V. 1/5, L, lat. 35. 1. transy, 6/13. 
Mouth narrow, protractile ; teeth of the jaws cardiform, in a short 
* Ann. & Mag. Nat, Hist. March 1860, p.169, pl. x. fg. As 
