174 REPTILES. 



of body with a small yellow spot in the centre ; head uniform. 

 Belly paler, minutely punctulated with black ; from the chin to 

 the tip of tail a lateral black line, formed by innumerable minute 

 black specks. Breadth of head |" ; length of cleft of mouth ^" ; 

 length of tail 4}" ; total length 20^". 



12. DiPSAS CENCHOA. 



Vipera cencoalt, Seba, ii. 16. 2. 3; Scheuchzer, t. 678. f. 3. 

 Coluber cenchoa, Linn. Syst. Nat. ed. xii. p. 389 ; Shaw, Gen. 

 Zool. iii. p. 475 ; Latr. Rept. iv. p. 129 ; Daud. Rept. vi. p. 283 ; 

 KuJil, Beitr. zur Zool. p. 88 ; Daubenton, Diet. Encycl. p. 601 ; 

 Weigel in den Scliriften der Berl, GesellscJi. Naturf. Freunde, t.iii.; 

 Lacep. Quadr. Ovip. Serp. ii. p. 316; Bonnat. Encycl. Meth. 

 pi. 29. f. 60. Bungarus cencoalt, Oppel, Ann. Mus. d'Hist. 

 Nat. xvi. p. 392. Natrix cenchoa, Merr. Tent. p. 114. Dipsas 

 cenchoa, Wied, Beitr. i. p. 396; Boie, Isis, 1827, p. 560; Wagl. 

 Syst. der Amph. p. 181. Dipsas weigelii et D. cenchoa, Fitz. Neue 

 Classif.', Schleg. Ess. pi. 11. f. 19, 20. Imantodes cenchoa, 

 Dum. ^ Bibr. vii. p. 1065. 



Body compressed and very slender ; tail extremely thin, nearly 

 half as long as trunk ; head large, very distinct from neck. Scales 

 in seventeen or nineteen rows, those of the vertebral line much 

 larger ; anal bifid. Whitish, with transverse rhomboidal brown 

 bands. 



a. Half-grown. Surinam. 



b. Young : tail injured. Venezuela. From Mr. Dyson's Col- 



lection. 

 c-g. Adult. Mexico. From Mr. Hugo Finck's Collection. 

 h. Adult. America. From the Collection of the Zoological 



Society. 

 i. Adult. America. From the Collection of the Zoological 



Society. 



5. DiPSADOMORPHUS, Fitzinger. 



Body and tail compressed, elongate ; head depressed, trian- 

 gular, broad behind, very distinct from neck ; one (in one species 

 two) loreal; one anterior, two posterior oculars; rostral mode- 

 rate ; scales moderate, in nineteen to twenty-three rows, smooth, 

 very much imbricate, in very oblique rows, those of the vertebral 

 row larger ; anal entire ; subcaudals two-rowed. Pupil elliptical ; 

 nostril moderate, between two shields. Posterior maxillary tooth 

 longest, grooved. East Indies ; Mexico. 



Dipsas, sp., Boie, Isis, 1827, P- 559; Gray, Indian Zool.; 

 Schleg. Ess. ii. p. 267 ; Dum. Sf Bibr. vii. p. 1 135. Dipsadomor- 

 phus, Fitz. Syst. Rept. p. 27- Coluber, sp., auct. prior. 



