276 COEUBEID^. 



5. Helicops trivittatus. (Plate XYIIl. fig. 2.) 

 Myron trivittatus, Qray^ Cat. p. 70 (1849). 



Eye email. Eostral miich broader than deep, visible from 

 above ; nasals usually in contact behind the rostral ; frontal about 

 twice as long as broad, as long as its distance from the end of the 

 snout, shorter than the parictals ; loreal deeper than long ; two prae- 

 and two or three iDostoculars ; temporals 1 +2 ; eight upper labials, 

 lourth entering the eye ; five lower labials in contact with the an- 

 terior chin-shields, which are nearly as long as the posterior. Scales 

 faintly keek d, in 21 or 23 rows. A^eutrals 120-130; anal divided; 

 subcaudals G3-G5. Coloration very much as in Ahastor erythro- 

 qramiifus. Dark olive above, with small black spots and five yel- 

 lowiir^h or reddish longitudinal streaks, outer widest ; belly yellow or 

 orange, with two regular longitudinal series of subcrescentic trans- 

 verse black spots. 



Total length 070 millim. ; tail 190. 



Brazil. 



a. 2 (Y.a26; C. 63). ? Zoological Society. (Type.> 



b. J (V. 120; C. ?). ? Zoological Society. 



c-d. Yg. (Y. 130, 129; Para. R. Graham, Esq. [P.]. 



C. 05, 65). 



6. Helicops carinicauda. 



Coluber carinicaudus, Wied, Beitr. ISat. Bras. i. p. SOO (1825), and 



Ahbild. (1826). 

 Helicops carinicaudus, Wagl. Icon. Avq^h. pi. vii. (1828); Dvm. <§' 



Bihr. vii. p. 744 (1854) : Jan, Arch. Zool. Anat. Fhys. iii. 1865, 



]). 252 ; Mensel, Arch. f. K'at. ItGS, p. 329 : Boulcng. Ann. 8)- May. 



N. H. (5) xvi. 1885, p. 297, and xviii. 1886, p._435. 

 Homalopsis carinicaudus, jSchkg. Fhys. ISer2J. ii. p. 350, pi. xiii. 



tigs. 17 & 18 (1837). 

 Helicops carinicaudus, var. ga'strosticta, Jan, I. c. 

 ■ infrataeniatus, Jan, Arch. Zool. Anat. Fhys. iii. 1865, p. 245, and 



Icon. Gen. 28, pi. iii. tig. 3 (1868) ; Cope, Froc. Am. Fhilos. Soc. 



xxii. 1885, p. 193. . • 



• trivittatus, Co2)e, Froc. Am. Fhilos. Soc. xvii. 1877, p. 92. 



baliogaster, C'o/;<=, Froc. Am. Fhilos. Soc. xxii. 1885, p. 193. 



Eye small ; rostral visible from al)0ve, forming a narrow suture- 

 with the internasal ; frontal twice as long as broad, widening pos- 

 teriorly, much longer than its distance irom the end of the snout, 

 as long as or a little shorter than the parietals ; loreal deeper than 

 long (rarely absent); one praa- and two postoculars ; temporals l-|-2 

 or 2-1-2 : seven or eight upper labials, third or fourth (rarely third 

 and fourth) entering the eye ; four or five lower labials in contact 

 with the anterior chin-shields, which are as long as or a little 

 shorter than the posterior. Scales in 19 rows, feebly keeled, 

 anteriorly, strongly keeled on the posterior part of the bodj- and on. 

 the tail; outer scales smooth. Yentrals 126-155; anal divided; 



