534 TIPEKID^. 



1. Lachesis mutus. 



Seha, Thes. ii. pi. Ixxti. fig. 1 (1735). 



Crotalus mutus, Linn. 8. J^. i. p. 373 (1766) ; ScMeff. Fhys. Serp. ii.. 



p. 570, pi. XX. figs. 19 & 20 (1837). 

 Boa muta, ZacSp. Serp. ii. pp. 128 & 389 (1789). 

 Ooluter crotalinus, Omel. S. N. i. p. 1094 (1789) ; Shaw, Zool. m. 



p. 400 (1802). 



alecto, Shaw, I. c. p. 405. 



Scytale catenata, Latr. Rept. iii. p. 162 (1802). 



ammodytes, Latr. t. c. p. 165 ; Daud. Sept. v. p. 347 (1803). 



Lachesis mutus, Daud. t. c. p. 351 ; Dum. ^ Biihr. vii. p. 1485 



(1864) ; Oarm. N. Am. Rept. p. 122 (1883) ; Lacerda, Legons 



Yen. Serp. Bris. p. 5 (1884) ; GiXnth. Biol. C.-Am., Rept. p. 188 



(1896). 

 Trigonoceptalua ammodytes, Oppel, Ordn. Rept. p. 66 (1811). 

 Cophias crotaHnus, Merr. Tent. p. 164 (1820). 

 Bothrops surucucu, Wagl. in Spix, Serp. Bras. "f. 59, pi. xxiii. (1824), 

 Lachesis rhombeata, Wied, Abhild. Nat. Bras. (1825). 

 Craspedoceplialua crotalinus, Oray, Ann. Philos. 1825, p. 206. 

 Lachesis mutus, part., Grai/, Cat. p. 13 (1849). 

 stenophrys. Cope, Journ. Ac. Philad. (2) viii. 1876, p. 152. 



Eostral as deep as broad or a little broader than deep ; nasal 

 divided ; upper head-scales very small, graniilar, smooth or obtusely 

 keeled; supraocular narrow; two or three scales separating the 

 internasals in front; 10 to 15 scales on a line between the supra- 

 oculars ; four or five series of scales between the eye and the upper 

 labials ; temporal scales obtusely keeled ; 9 or 10 upper labials, 

 second usually forming the anterior border of the loreal pit, third very 

 large. Scales tubercularly keeled, feebly imbricate, in 35 or 37 rows. 

 Ventrals 200-230 ; anal entire ; subeaudals 32-50, all or greater- 

 part in pairs and followed by very small keeled scales covering the 

 end of the tail. Yellowish or pinkish above, with a series of large 

 rhomboidal dark brown or black spots enclosing smaller light spots ;. 

 a black streak from the eye to the angle of the mouth. 



Total length 1995 millim. ; tail 170. 



Central and Tropical South America. 



Or-h. Yg. (Sc. 37, 36 ; Panama. 

 V. 202, 206 ; 0. 36, 37). 



c. 6 (So. 37; V. 226; Demerara ? Col. E. Sabbe [P.]. 

 C.36). 



d. 5, head and tail Surinam. C. W. EUascombe, Esq^ 

 (C. 36). [P.]. 



e. S (Sc. 35 ; "V. 223 ; Pernambuco. W. A. Forbes, Esq. [P.].. 

 C. 37). 



f. 6 (Sc. 35; V. 225; Bahia. Dr. 0. Wucherer [0.]. 

 C. 34). 



g. Ad., stfia. Brazil. Mrs. Parker [P.]. 



h. $ (Sc. 35; V. 225; Cayaria, N.E. Mr. W. Davis [C.];. 



C. 36) Peru. Messrs. Veitch [P.]. 



i. ? (Sc. 35 ; V. 226 ; Bolivia. M. Suarez [P.]. 



C. 36). 



