220 



COLUBRIDiE. 



Tropiclonolus natrix, var. concolor, F. Midi. I. c. 



natrix, var. astreptophorus, Seocirie, Idciid. de Lacerta schreiberi, 



^■c, p. 15 (1885). 



Eye moderate. Eostral broader than deep, visible from above ; 

 interiiasals at least as broad as long, trapezoid, shorter than the 

 pra^frontals ; frontal once and one third to once and a half as long- 

 as broad, as long as its distance from the end of the snout or a little 

 shorter, shorter than the parietals ; loreal deeper than long; one 

 (rarelj' two) praj- and three (rarely two or four) postoculars ; tem- 

 porals 1-f 2 ; seven upper labials, third and fourth entering the eye ; 

 four or five lower labials in contact with the anterior chin-shields, 

 which are shorter than the posterior. Scales strongly keeled, of 

 outer row smooth or faintly keeled, in 19 rows. Ventrals 157-11)0 ; 

 anal divided ; subca'udals 50->8. Grey, olive, or brown above, with 

 bhick spots or narrow cross-bands ; labials white or yellowish, with 

 the sutures between the shields black ; belly usually checkered black 

 and white or grey. 



Total length 1120 millim. ; tail 210. Reaches a length of two 

 metres (G^j feet). 



Europe, Algeria, ^Yest and Central Asia. 



A. The typical form. A white, yellow, or orange collar, usually 

 divided in the middle, sometimes absent, bordered behind by a 

 broad deep black collar, which is constant. 



a. 2 (V. 166; C. 58). 



b,c, d-e. 2 (V. 161,165; 



C. 55, 58), hgr. c^ (V. 



173; C.64),&yg. (V. 



166; C. 66). 

 /, i/. ^'- Eggs. 

 i. d (V. 170 ; C. 66). 

 k. d (V. 166; C. 60). 

 /. 5 (V. 172 ; C. 58). 



m-7i. 2 (V. 165, 168 ^ C. 



63, 60). 

 OS. J (V. 175; C. 71), 



2 (V. 165, 1(59; C. 64, 



62), &yg. (V.177,172; 



C.'76, 72). 

 t-n. d (V. 176 ; 0. ?) & 



2 (V. 176; C. 60). 

 r. Yg., two-headed 



monster. 

 w. Ad., skel. 

 X, y. Skulls. 



Hale, near Salis- 

 bury. 

 Devonshire. 



London. 

 England. 

 Gotland. 

 Sweden. 



Near St. Malo. 



Bolofrna. 



l!ev. H. G. W. Aubiey 



[P.J. 



Dr. Eiseu [P.]. 



C. J. A. Thuden, Ef^q. 



[P.]. 

 G. A. Bouleuger, Esq. 



[P.]. 

 Prof. Biauconi [P.]. 



Disk, E. Turkestan. Rev. H. Lansdell [C.]. 



Paris 



33. Collar altogether absent, or redxiced to a small black blotch on 

 each side of the nape. (Var. astreiitophorus, Seoane.) 



a. 2 (V. 157; C. 50). Cornnna. M. V. L. Seoane [P.]. 



h. d (V. 166; C. 77). Albufera do Va- Lord Lilford [P.j. 



lencia. 



