COLTTBEID*. 



Saiayacu, N.E. Peru. 



MoyoTjam'ba, N.E. 

 Peru. 



Mr.W.DaTis[C.]; 



Messrs. Veitch 



[P.]. 

 Mr. A. H. KofF 



[C.]. 



Santarem. 



Upper Amazon. 

 Rio Ucayali. 



Upper Amazon. 



Madre de Dies, Bolivia. 

 Charobamba, Bolivia. 

 Para, 



S. America. 



H. W. Bates, Esq. 

 [C.]. 



Dr. E. A. Goldi 



[P.]. 

 Mr. E. Bartlett 



[0.]. 



98 



e,f. S (V. 193, 184; C.89, 

 88). 



g^m, n-o. S (V. 191, 189 ; 



C. 98, 96), ? (V. 192, 



189,190; 0. 89, 82, ?), 



Igr. (V. 194, 182; C. 96, 



91), & yg. (V. 175; 



C. 92). 

 p. ? (V. 187; 0.78). 



q. e (V.192; C. 94). 

 r-t. 2 (V. 186, 194,187; 



0. 87, 82, 82). 

 It. Yg. (V. 190; 0. 90). 



V. S (V. 190 ; C. 97). 

 w. d (V.194; 0.98). 

 X. Hgr. (V.192; 0.97). 



y-z. (J (V. 184, 179; 0.89, 

 84). 



153. CHAM^TORTUS. 



Ohamsetortus, Giinth. Proe. Zool. Soc. 1864, p. 310. 



Maxillary teeth 12, gradually and feebly increasing in length, 

 followed, after a short interspace, by a large grooved fang situated 

 below the posterior border of the eye ; mandibular teeth subequal. 

 Head distinct from neck ; eye large, with vertically elliptic pupil ; 

 posterior nasal concave ; loreal entering the eye. Body compressed.; 

 scales smooth, with apical pits, in 17 rows ; ventrals obtusely 

 angulate laterally. Tail long ; suboaudals in two rows. 



East and Central Africa. 



E. Graham, Esq. 



[P.]. . 

 E. Bowerbank, 

 Esq. [P.]. 



1. ChamsBtortus aulicns. 



Ohamsetortus aulicus, Giinth. I. c. pi. xxvi. fig. 2 ; Peters, JReise n. 

 Mossamb. iii. p. 128 (1882). 



Rostral nearly twice as broad as deep, just visible from above ; 

 intemasals a little broader than long, a little shorter than the 

 praefrontaJs ; frontal once and two thirds to twice as long as broad, 

 longer than its distance from the end of the snout, shorter than the 

 parietals ; loreal a little longer than deep, bordering the eye below 

 a small prseooular; two postoculars; temporals 1 + 1; eight upper 

 labials, third, fourth, and fifth entering the eye ; five lower labials 

 in contact with the anterior chin-shields, which are a little longer 

 than the posterior. Scales in 17 rows. Ventrals 172-195 ; anal 

 entire ; subcaudals 81-95. Brown above, the back with numerous 

 whitish, dark-edged cross-bars, the sides spotted with whitish j head 

 whitish, spotted and marbled with brown, and with a brown streak 

 on each side, passing through the eye ; labials edged with brown ; 

 beneath white. 



