536 



VIPERID^. 



pair of large intemasals, usually forming a suture with each other, 

 and a large canthal ; two or three postoculars and one, two, or three 

 suboculars, separated from the labials by one or two series of scales ; 

 temporal scales keeled ; seven or eight upper labials, second forming 

 the anterior border of the loreal pit. Scales in 23-33 rows, sharply 

 keeled. Ventrals 180-240 ; anal entire ; subcaudals 46-70, all or 

 greater part in two rows. Coloration very variable : grey, brown, 

 yellow, olive, or reddish above, uniform or with more or less distinct 

 dark spots or cross-bands, or with dark triangles on the sides in- 

 closing pale rhombs; a dark streak from the eye to behind the 

 angle of the mouth ; lower parts yellowish, uniform or powdered or 

 spotted with brown, or brown with light spots. 



Total length 1600 millim.; tail 190. 



Tropical America. 



a-b. 2 (Sc. 27 ; V. 209 ; 



0. 62) & hgr. (Sc. 27 ; 



V. 208; C. 61). 

 c. Yg. (Sc. 29 ; V. 212 ; 



0. 62). 

 d (? (Sc. 25; V. 214; 



C. 67). 

 ',/,&■ ? (Sc. 27, 27. 27 ; 



V. 220, 213, 221 ; C. 58, 



67, 60). 

 h,i,k. c? (Sc.27;V.210; 



C..P)&yg. (Sc.27,25; 



V. 208, 196 ; 0. 70, 69). 

 I. c? (Sc. 25; V. 212; 



C. 62). 

 m. Yg. (Sc. 26 ; V. 195 ; 



C.71). 

 n. Yg. (Sc. 25; V. 189 



C.71). 

 o. Yg. (Sc. 27; V. 210; 



C. 69). 

 p. ? (Sc. 33; V. 226; 



C.61). 

 q. 2 (Sc. 27 ; V. 211 ; 



C. 66). 

 r, s, t. Hgr. (Sc. 30, 31, 



29; V. 217, 220, 212; 



C. 67, 69, 65). 

 u. 2 (Sc. 27; V. 213; 



C. 67). 

 V. Hgr. (Sc. 25; V. 200; 



C. 67). 

 JO-y- 6 (Sc. 23; V. 191; 



C. 601, hgr. (Sc. 23; 



V. 196; C. 62), & ye. 



(Sc.25;V. 196; 0.64). 

 s. ? (Sc. 25; V, 197; 



C. 62). 

 a. 2 (Sc. 29; V. 214; 

 C. 65). 



Atoyac, Guerrero. 



Teapa, Tabasco. 



Tehuantepec. 



Mexico. 



Mexico. 



Mr. H.H.Smith [0.]; 



F. D. Godman,Esq. 



[P.]. 

 F. D. Godman, Esq. 



[P.]. 

 M. F. Sumichrast [C.]. 



Mr. Hugo Finck [C.]. 



