138 OPHIDIA. 
one-third the size of the posterior, which are slightly bent downwards to the side of the 
head ; the vertical is pentagonal, longer than broad; the occipitals are rounded poste- 
riorly. Nostril situated between two nasals; loreal quadrangular ; one anterior and two 
posterior .oculars ; seven or eight upper labial shields, the third and fourth or 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 median lower 
labial is triangular and rather small; nine lower labials, the first of which is in con- 
tact with its fellow behind the median shield. There are two pairs of chin-shields of 
nearly equal size. Scales 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 and 87; anal divided. 
The ground-colour of the upper parts is dirty white; the upper part of the head 
is brown; there is a whitish collar behind the occipitals. Fifty-one or fifty-four black 
bands cross the trunk and extend on to the edge of the belly ; they are broader than 
the interspaces between, and become interrupted and spot-like on the tail. 
All the lower parts are uniform whitish. 
inches. lines. 
Totallength. ©. 2.) - + ee eee 21 1 
Length of the head. . - - - + + = 0 7 
Greatest width of the head . . . - - + 0 54 
Length of the trunk . «© © - + e+ 14 6 
rn 
3. Hypsiglena latifasciata, sp.n. (Tab. XLIX. fig. B.) 
Hab. Sovrnmrn Mexico (Mus. Godman & Salvin). 
Scales in twenty-one series. Head broad, depressed, distinct from neck. Pupil 
vertical. Anterior frontals two-thirds of posterior ; vertical much longer than broad, 
as long as occipitals. Hight upper labials, the third, fourth, and fifth entering the 
orbit; loreal higher than long; one anterior and two posterior oculars; temporals 
14243; two pairs of chin-shields, the posterior the shorter ; trunk with alternate 
black and whitish cross-bands, the black ones being about four times as broad as the 
whitish, seven on the trunk and three on the tail. Lower parts uniform whitish; the 
upper part of the head backwards to the occipitals and the sides of the head are 
mottled with brown, whilst the whole occipital region is occupied by a nearly uniform 
yellowish patch, bordered behind by a black nuchal band and on the sides by a 
brownish band running from the eye backwards. Ventrals 186; anal divided; sub- 
caudals 74. 
A single specimen, 133 inches long, the tail measuring 3 inches. 
