11. LACHESIS. 565 



34. Lachesis biliueatus. 



OopMas bilineatus, Wied, Beitr. Nat.. Bras. i. p. 483, and Ahbild. 



(1825). 

 Trigonocephalus bDineatus, Schleg. Phys. Serp. ii. p. 640, pi. xix. 



figs. 7 & 8 (1837) I Peters, Mon. Berl. Ac. 1862, p. 673. 

 Craspedocephalus bilineatua, Gray, Cat. p. 7 (1849). 

 Bothrops bilineatus, Bum. 8f Bibr. yii. p. 1514 (1854) ; Jan, Icon. 



0£n. 47, pi. i. figs. 2 & 3 (1875). 

 Trigonocephalus (Bothrops) arboreus, Cope, Proc. Arrier. Philos. Soe. 



xi. 1869, p. 157. 



Snout rounded, withi sharp, somewhat raised canthus. Rostral 

 as deep as broad ; nasal divided or semidivided ; upper head-scales 

 small, imbricate, keeled, 5 to 8 in a transverse series between the 

 supraocular shields, which are very large ; internasal shields large 

 and in contact with each other, followed by a large canthal ; two or 

 three postoculars and one or two suboculars, separated from the 

 labials by one series of scales ; temporal scales keeled ; 7 or 8 upper 

 labials, second forming the anterior border of the loreal pit. Scales 

 strongly keeled, in 27-36 rows. Ventrals 198-218 ; anal entire ; 

 subcaudals 59-71, all or greater part in pairs. Tail prehensile. 

 Green above, uniform or speckled with black ; a yellow lateral 

 streak or series of spots running along the outer row of scales ; 

 beUy white ; end of tail reddish. 



Total length 840 mUlim. ; tail 125. 



Brazil, Bolivia, Peru, Ecuador. 



a. d (Sc. 29 ; V. 211 ; Bahia. Dr. Wucherer [0.]. 

 C. 68). 



b. 2 C^c. 33 ; V. 207 ; Bahia. Zoological Society. 

 C. 59). 



e. $ (Sc. 29; V. 193; Oampolican, Bolivia. 

 C. 65). 



d. ? (Sc. 27; V. 205; Moyobamba, Peru. Mr. A. H. RoiF [0.]. 

 C. 68). 



e. Yg. (Sc. 27 ; V. 201 ; Canelos, Ecuador. Mr. 0. Buckley [0.]. 

 C. 66). 



/. 2 (Sc. 27 ; V. 201 ; W. Ecuador. Mr. Eraser [0.]. 



C. 62). 



35. Lachesis undulatns. 



Trigonocephalus (Atropos) undulatus, Jan, Rev. Sr May, Zool. 1 859, 



p. 157, and Prodr. pi. E (1859;. 

 Atropos undulatus, Jan, Elenco, p. 127 (1863). 

 Teleuraspis undulatus, Garm. N. Am. Mept. p. 126 (1883). 

 Ophryacus undulatus, Cope, Bull. U.S. Nat. Mus. no. 32, 1887, 



p. 88. 

 Bothrops undulatus, Giinth. Biol. C.-Am., JRept. p. 187 (1895). 



Snout short, rounded, with well-marked canthus. Eostral once 

 and a half to twice as broad as deep ; nasal divided ; upper head- 

 scales very small, juxtaposed or subimbricate, 14 to 20 across from 

 eye to eye ; no supraocular shield, but a long erect horn-like scute 

 above the. eye ; internasals small ; some of the scales on the canthus 



