154. oxyRHopPvs. 105 
snout rounded, scarcely projecting. Rostral broader than deep, just 
‘visible from above ; internasals much shorter than the preefrontals ; 
frontal slightly longer than broad, as long as its distance from the 
end of the snout, a little shorter than the parietals ; loreal much 
longer than deep; one preocular, usually forming a narrow suture 
with the frontal; two postoculars; temporals 2+3; eight upper 
labials, fourth and fifth entering the eye; four or five lower labials 
in contact with the anterior chin-shields, which are as long as or a 
little longer than the posterior. Scales in 19 rows. Ventrals 
185-206; anal entire; subcaudals 76-89 pairs. Red above, the 
scales tipped atid edged with black ; head black above, usually with 
a light cross-band behind the parietals and one or two black cross- 
bands on the nape; the snout sometimes yellow ; black cross-bands 
_ disposed in threes may be present on the body ; lower parts yellow. 
Total length 890 millim.; tail 175, 
Upper Amazon, Bolivia. 
a. Yg. (V.197; C.85). Peruvian Amazon, Mr. E. Bartlett [C.]. 
(Type.) 
b. 3 (V. 206; C. 76). Upper Amazon. Mr. rh Bartlett [C.]. 
cd. 3 (V. 187, 185; oyobamba, Peru. Mr.A.H. Roff[C. 
C. 81, 82). 
é. & (V.191; C.?). Pozuzu, Peru. Mr. W. Davis [C.]; 
Messrs. Veitch | P.]. 
ft, g- & (V. 196, 185;  Sarayacu, Peru. Mr. W. Davis [C.]; 
~ ©. 89, 88) Messrs. Veitch 
hi. & (V. 194, 197; RB. Ucayali. Dr. E. A. Géldi [P.]. 
C. 87, 86). 
k. Yg. (V. 206; C. 76). Yungas, Bolivia. 
5. Oxyrhopus melanogenys. 
Sphenocephalus melanogenys, Tschudi, Faun. Per., Herp. p. 49, 
pl. iv. (1846). 
Oxyrhopus tergeminus, part., Jan, Icon, Gén. 36, pl. i. fig. 3 (1870). 
Eye small, its diameter not more than one third the length of the 
snout; snout rounded, scarcely projecting. Rostral broader than 
deep, just visible from above; internasals shorter than the pre- 
frontals; frontal slightly longer than broad, as long as its distance 
from the end of the snout, shorter than the parietals ; loreal much 
longer than deep ; one preocular, reaching the upper surface of the 
head but separated from the frontal; two postoculars; temporals 
2+3; eight upper labials, fourth and fifth entering the eye; five 
lower labials in contact with the anterior chin-shields, which are as 
long as the posterior. Scales in 19 rows. Ventrals 206; anal 
entire; subcaudals 79 pairs. Red or pale reddish brown above, dotted 
with blackish brown; head blackish brown above; nape blackish 
brown or with a pair of black cross-bands ; anterior half of body with 
a few black cross-bands disposed in threes; belly yellowish. 
Total length 680 millim. ; tail 170. 
Chanchamayo, Peru. 
