280 COLUBRID. 
the eye; five lower labials in contact with the anterior chin- 
shields, which are as long as the posterior. Scales in 21 rows, all 
strongly keeled. Ventrals 116-120; anal divided ; subcaudals 88. 
Grey above, with three longitudinal series of black spots, which are 
confluent into longitudinal streaks on the sides of the head and on 
the nape; the middle row of spots largest ; ventrals grey, with a 
yellowish streak in the middle, or yellow with blackish spots, 
Total length 410 millim.; tail 150. The specimen in the collee- 
tion measures 350 millim, without the tail, which is injured. 
Venezuela and Colombia. 
a. § (V.116; C.?). Rosario de Cucuta, Colombia. » Mr. Webber [C.]. 
11. Helicops polylepis. 
Helicops polylepis, Giinth. Ann. § Mag. N. H. (3) vii. 1861, Pp: 426, 
Tachynectes chrysostictus, Cope, Proc, Ac. Philad, 1862, p. 71. 
Helicops spixii, Jan, Arch. Zool. Anat. Phys, iii. 1865, p, 249, and 
Icon. Gén. 28, pl. ii. fig. 2 (1868). 
Eye rather small; rostral visible from above, in contact with the 
internasal; frontal twice as long as broad, as long as or a little 
longer than its distance from the end of the snout, as long as or a 
little shorter than the parietals; loreal trapezoid; one pre- and 
two postoculars; temporals 2+2, 243, or 1438; eight upper 
labials, fourth or third and fourth entering the eye; five or six 
lower labials in contact with the anterior chin-shields, which are as 
long as the posterior. Scales in 23 or 25 rows, all keeled, the keel 
on the outer row feeble. Ventrals 124-138; anal divided; sub- 
caudals 76-84. Brownish or olive-grey above, with blackish spots 
disposed in five alternating rows, the middle ones largest; blackish 
beneath, with round yellow spots. . 
Total length 430 millim., ; tail 130, 
Brazil, North-eastern Peru. 
a. 3 (Se. 25 (26); V.1383; Upper Amazon. (Type.) 
C. 82 
b. Hgr. (Se. 28; V.124; Peruvian Amazon. _—Mr. E, Bartlett [0.}. 
C. 79). 
15. HYDRETHIOPS. 
Hydreethiops, Giinth. Ann. § Mag. N. H. (4) ix. 1872, p. 28. 
Maxillary teeth 20-22, increasing in size posteriorly ; mandi- 
bular teeth decreasing in size posteriorly, Head slightly distinet 
from neck; eye small, with round pupil; nostrils directed up- 
wards, pierced between two nasals; a single internasal. Body 
cylindrical; scales striated and keeled, with apical pits, in 23 rows; 
ventrals rounded. ‘Tail moderate ; subcaudals in tworows. Hypa- 
pophyses developed throughout the vertebral column. 
Tropical Africa. \ 
«~ 
Laie = 
[oo 
