86. HYDRO PS. 187 



divided nasal ; a single internasal ; no loreal. Body cylindrical, 

 slrnder ; scales short, smooth, without apical pits, in 15 or 17 rows; 

 ventrals rounded. Tail rather short ; subcaudals iu two rows. 

 v uth America. 



1. Hydrops triangularis. 



Flaps triangularis, If *<//. in .S).r, Serp. liras. p. 5, pi. 2a. fig. 1 (1824). 

 1 lomalopsis martii, Schkg. Phys. Serp. ii. p. 356, pi. xiii. h'gs. 19 & 20 



1 1 887;. 



II\ .irops inartii, Gray, Zool Misc. p. 68 (1842), and Cat. p. 75 (1849) ; 



'Dum. $ Bibr. vii. p. 484 (1854) ; GitnfJi. Ann. $ Mag. N. H. (4) 



i. 1868, p. 421. 



I IL'ina fasciata, Gray, II. cc. pp. 67, 75. 

 Calopisma martii, Jan, Arch. Zool. Aiiat. Phys. iii. 1865, p. 242, and 



Icon. G6n. 29, pi. \\. 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 

 prae- and two postoculare ; 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.) 



170, 168, 176, 168; C. 



56 58, ? 56 o I ' 



/. Yg. (V. W; C. 46). Demerara. Zoological Society. 



y-i. 2 (V. 169, 101, 106; Berbice. 



C. 45, 43, 45). 



k. Hgr. (V. 166 ; C. 64). Surinam. W. Carruthers, Esq. [P.I 



/. Yg. (V. 175; C. 42). Surinam. 

 m, n. Hgr. (V. 159; C. 00) ? 



,v.vg.(V. 157; C.58). 



2. Hydrops martii. 



Klaps martii, Wagler, in Spir, Serp. Bras. p. 3, pi. ii. fig 2(1- 

 Hydropa callostictus, Giinih. Ann. $ Mag. A*. //. (4) i. 1868, p. 421, 

 pi. xvii. fig. B. 



Very closely allied to the preceding, but scales in 1 7 rows. Ten- 

 trals 168-179; subcaudals 71-76. Red, back purplish, with black 

 amiuli, which are bordered on the upper surface of the body with 

 round whitish spots. 



Total length 285 millim. ; tail 00. 



Brazil and N.E. Peru. 



a. Hgr. (V. 108; C. 71). Chyav.-tns Upper Mr. F, Hnrtl.-tt [C.]. 



Amazon. (Type of//, callwtictut.) 



