11. LACHESIS. 



539' 



n-0. Yg. (Sc. 25, 25 ; V. 



194, 200 ; 0. 61, 62). 

 p. Yg. (Sc. 25; V. 200 



C. 68). 

 g,r-v. cJ (Sc.27; V.196 



C.70)&yg.{Sc.25,27: 



27,27,25; V. 203, 195; 



187,194,185;C.75,60; 



74, 63, 63). 

 to. d (Sc. 25 ; V. 196 



C. 69). 

 V. Yg. (Sc. 26 ; V. 186 



0. 63). 

 y. Yg. (Sc. 25; V. 185 



C. 66). 

 z. Hgr. (Sc. 27; V. 190 



C. 67). 

 a. d (Sc. 27; V. 193 



C. 68). 

 P-y. d (Sc. 25 ; V. 196 



C. 65) & 2 (Sc. 25 



V. 198 ; 0. 59). 

 8,e-K.d (Sc. 25; V. 183 



C.71)&yg. (So.27,27 



27, 25, 25, 25 ; V. 185' 



190,194,183,182,176: 



C. 73, 61, 59, 70, 70, 69) 

 X-p. d (Sc. 25 ; V. 161 



0. 47) & $ (Sc. 27 



V. 200; C. 58). 

 V. Yg. (Sc. 27 ; V. 177 



C. 66). 



4, 



Oanelos, Ecuador. 

 Pebas, Peru. 

 Moyobamba, Peru. 



Pozuzu, Peru. 

 Sarayacu, Peru. ' 

 Cayaria, Peru. 

 Demerara. 

 Demerara. 

 Berbice. 



Berbice. 



Brit. Guiana. 



Para. 



Lachesis pnlclier. 



Mr. Buckley [C.]. 

 Mr. Hauxwell [O.J. 

 Mr. A. H. RofF[C.], 



H. J. Veitch, Esq, 



Mr. W. Davis [C] ;. 



Messrs.Veiteh [P.]. 

 Mr. W. Davis [0.] ; 



Messrs.Veiteh [P.], 

 Lieut. Friend [PJ. 



Mr. Snellgrove [C], 



Lady Essex [P.]. 



Demerara Mus. [P.], 



L. 



Trigonocephalua pulcher, Peters, Man. Berl. Ac. 1862, p. 672. 



Snout broad, rounded, ■with sharp, slightly raised canthus, 

 Eostral as deep as broad or slightly deeper than broad ; nasal 

 divided ; upper head-scales imbricate, largest and smooth on the 

 snout, obtusely keeled and in 5 to 7 longitudinal series between 

 the large supraoculars, -with strong, short keels on the occiput ;, 

 a pair of large internasals and a large canthal; two postoculars 

 and a subooular, separated from the labials by one series of scales ;. 

 temporal scales keeled ; seven upper labials, second forming the 

 anterior border of the loreal pit. Scales in 21 or 23 rows, strongly 

 and tubercularly keeled, the keels much shorter than the scales, 

 Ventrals 156-172 ; anal entire ; suboaudals 58-64 pairs. Olive- 

 grey above, with brown, light-edged cross-bands which are con- 

 tinuous, or broken on the vertebral line and alternating ; a light 

 streak from the eye to behind the angle of the mouth ; belly closely 

 powdered with brown, with darker and lighter spots on the sides. 



Total length 685 millim. ; tail 115. 



Andes of Ecuador. 



a. Hgr. 5 (So. 23 ; V. 156 ; 0. 58). Quito. 



h. $ (Sc. 23; V. 158; 0. 64). Intac. Mr. Buckley [0], 



