11. LiCHBSIS. 541 



a. Hgr. (Sc. 23 ; V. 157 ; C. 45). Lima. Ohristiania Mus. 



*, c. Yg. (Sc. 22 ; V. 167 ; C. 42) Lima. Prof. W. Nation [P.]. 



& head and tail (0. 40) of $ . 



7. Lacliesis alternatus. 



Craspedocephalus brasiliensia (non Lacep.), Gray, Cat. p. 5 (1849). 



Bothrops alternatus, Dum. ^ Bibr. vii. p. 1612, pi. Ixxxii. fig. I 

 (1854) ; Guichen. in Casteln. Anim. Nouv.Amir. Sud, Sept. p. 76 

 (1855) ; Jan, Icon. Gin. 47, pi. vi. flg. 1 (1876) ; Bmileng. Ann.- 

 ^ Mag. N. U. (5) xviii. 1886, p. 438. 



Trigonoceplialus alternatus, Jan, Rev. 8f Mag. Zool. 1859, p. 155. 



Bothrops atrox, part., Hensel, Arch.f. Nat. 1868, p. 334. j 



Head narrow, elongate ; snout obtusely pointed, with sharp 

 canthus. Eostral as deep as broad or a little deeper than broad ; 

 nasal divided ; upper head-scales small, imbricate, strongly keeled, 

 in 10 to 13 longitudinal series between the supraoculars, which are 

 rather narrow ; a pair of large internasals, in contact with each 

 other, each followed by a canthal ; two or three postoculars and 

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

 scales ; loreal pit separated from the labials by small scales ; temporal 

 scales keeled; 8 or 9 upper labials, second small. Scales very 

 strongly keeled, in 29-35 rows. Ventrals 167-181 ; anal entire ; 

 subcaudals 34-51 pairs. Brown above, very elegantly marked with 

 opposite or alternating pairs of large C'staped, dark brown markings- 

 edged with black and yellow and separated by narrow interspaces- 

 of the ground-colour ; a series of smaller spots on each side ; head 

 dark brown above, with a J-shaped light marking, the transverse 

 branch between the eyes, and a light line from the canthus rostralis- 

 to the angle of the mouth ; rostral and anterior labials white, the 

 former with a dark brown vertical bar ; chin and throat with dark- 

 longitudinal streaks ; belly whitish, spotted with brown or black- 

 tail with two dark streaks below. 



Total length 1190 miUim. ; tail 110. 



Southern Brazil, Paraguay, Uruguay, Argentina. 



a, b. S (Sc. 29, 32 ; V. 188, Brazil. 



178 ; C. 34, 32). 

 c, d-e. S (Sc. 31 ; V. 179 ; S. Lorenzo, Eio Grande Dr. H. v. Ihering [C], 



C. 42) & yg. (Sc. 29, 33 ; do Sul. 



V. 174, 176 ; C. 45, 38). 

 /. Hgr. (Sc. 29; V. 180; Paraguay. Prof. Grant [P.]. 



C. 42). 

 g. $ (Sc. 36 ; V. 181 ; Asuncion, Paraguay. Dr. J. Bohls [0.]. 



C. 34). 

 h. 6 (Sc. 31 ; V. 167 ; Rosaria, Argentina. E. W. White, Esq, 

 • C. 41). [C.]. 



«. $ (Sc. 33 ; V. 178 ; Argentina. Zoological Society. 



C. 41). 



