86. HYvROPs. 187 
divided nasal; a single internasal; no loreal. Body cylindrical, 
slender; scales short, smooth, without apical pits, in 15 or 17 rows ; 
ventrals rounded. Tail rather short; subcaudals in two rows. 
South America. 
1. Hydrops triangularis. 
Elaps triangularis, Wagl. in Spix, Serp. Bras. p.5, pl. 2a. fig. 1 (1824). 
Homalopsis martii, Schleg. Phys. Serp. ii. p. 356, pl. xiii. figs. 19 & 20 
(1837). 
Hydrops martii, Gray, Zool. Misc. p. 68 (1842), and Cat. p. 75 (1849) ; 
Dum. § Bibr. vii. p. 484 (1854) ; Grinth. Ann. § Mag. N. H. (4) 
i. 1868, p. 421. 
Higina fasciata, Gray, ll. cc. pp. 67, 75. 
Calopisma martii, Jan, Arch. Zool. Anat. Phys. iii. 1865, p. 242, and 
Icon. Gén. 29, pl. iv. fig. 1 (1868). 
Snout broadly rounded. Rostral much broader than deep, scarcely 
visible from above; nasals in contact with each other behind 
the rostral ; internasal rhomboidal, nearly twice as broad as long ; 
frontal a little longer than broad, as long as or longer than its dis- 
tance from the end of the snout, shorter than the parietals; one 
pre- and two postoculars; temporals 1+1; eight upper labials, 
fourth entering the eye; four lower labials in contact with the 
anterior chin-shields, which are as long as or shorter than the 
posterior. Scales in 15 rows. Ventrals 145-176; anal divided ; 
subcaudals 40-66. Purplish brown above, red on the sides, white 
below ; with black annuli, which may be interrupted and alternate 
on the middle dorsal and ventral lines. 
Total length 780 millim.; tail 110. 
Guianas, Brazil. 
a-b, c-e. Hgr. (V. 165, Demerara. (Types of H. fasciata.) 
70, 1685 176, 168.C° 
56, 58, 2, 56, 54). 
gore. (V. 167.5 C.46). Demerara. Zoological Society. 
g-t. 2 (V. 169, 161, 166; Berbice. 
C. 45, 43, 45). 
k. Hgr. (V. 166; C. 64). Surinam. W. Carruthers, Esq. [P. |. 
bo Ye. (V. 175; C. 42): Surinam. 
2 
m,n. Hgr. (V. 159; C. 60) 
& yg. (V. 157; C. 58). 
2. Hydrops martii. 
Elaps martii, Wagler, in Spix, Serp. Bras. p. 3, pl. ii. fig 2 (1824). 
Hydrops callostictus, Giinth. Ann. § Mag. N. H. (4) i. 1868, p. 421, 
pl. xvii. fig. B. 
Very closely allied to the preceding, but scales in 17 rows. Ven- 
trals 168-179; subcaudals 71-76. Red, back purplish, with black 
annuli, which are bordered on the upper surface of the body with 
round whitish spots. 
Total length 265 millim. ; tail 60. 
Brazil and N.E. Peru. 
a. Hgr. (V. 168; C.71). | Chyavetas, Upper Mr. E. Bartlett [C.]. 
Amazon. (Type of H.. callostictus.) 
