in the Collection of the British Museum. 127 
of the head united, or by the body being: moderately elongate, 
surrounded by not numerous series of scales. The last of the 
genera mentioned appears to be undescribed. 
Hypropuosvs. 
Head slightly depressed, broader than the neck; body and 
tail moderately slender, compressed, the ventral shields being 
angularly bent on the sides; loreal distinct, two anterior and 
two posterior oculars ; one nasal, pierced by the nostril. Scales 
in thirteen rows, smooth, short, rounded, with a single groove at 
the apex. Teeth equal in length, smooth. 
Hydrophobus semifasciatus. Pl. IX. fig. 6. 
Shields of the upper surface of head regular ; anterior frontals 
more than half the size of the posterior; vertical five-sided ; 
occipitals rounded behind, much longer than vertical ; rostral 
broader than high ; loreal square, the upper ocular does not reach 
to the vertical. Seven upper labials, the third and fourth en- 
tering the orbit. Six small temporals, that on the side of the 
hind portion of the occipital being elongate, twice the size of the 
others ; two are in contact with the oculars. Two pairs of chin- 
shields, the anterior being thrice the size of the posterior. The 
chin-shields are in contact with five pairs of lower labials. Back 
of the trunk broad, rounded. Ventral shields 232, anal bifid, 
subcaudals 84. 
The ground-colour is pure white; back of trunk and tail 
erossed by fifty dark-brown bands, which are much broader than 
the interspaces between them, and do not extend downwards to 
the ventral shields. Upper part of the head brown to the 
posterior half of the occipital. 
Length of head 3 lines, of trunk 75 lines, of tail 27 lines. 
A single specimen (locality unknown) has been presented by 
T. C. Eyton, Esq. 
Philodryas Reinhardtii. 
Prof, Reinhardt (Vidensk. Medd. naturh. Foren. Kjébenh. 
1860, p. 224) refers Philodryas viridissimus to those snakes the 
scales of which are provided with two grooves at the apex, whilst 
Dr. Wucherer of Bahia describes those scales as one-grooved 
(Proc. Zool. Soc. 1861, Dec. 10.). I was induced by these 
contradictory statements to examine fifteen specimens of this 
snake, and found that those from Guiana had two-grooved scales 
and those from Brazil one-grooved. This led to a closer exami- 
nation and search for other accompanying characters, whereby I 
was fully convinced that two species are confounded under the 
name Ph, viridissimus. The northern species (Pl, IX, fig. 8) has 
