220 



COLUBEIB^. 



Tropidonotus natrix, var. concolor, F. Mull. I. c. 



natrix, var. astreptophorus, Seoane, Idend. de Lacerta schreiberi, 



^c, p. 15 (1885). 



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

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

 prsefrontals ; 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 

 (rarely two) pras- and three (rarely two or four) postoculars ; tem- 

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

 four or live 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. Ventrala 157-190 ; 

 anal divided ; suhcaudals 50-fc8. Grey, olive, or brown above, with 

 black 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. Eeaches a length of two 

 metres (6| feet). 



Europe, Algeria, West 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. $ (V. 166; C. 58). Hale, near Salis- Kev. H. G. W. Aubrey 



bury. [P.J. 



h,c,d-e. $ (V. 161,165; Devoushire. 



C. 55, 58), hgr. d' (V. 



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



166; C. 66). 



/, (J, h. Eggs. London. 



i. <S (V. 170 ; C. 66). England. 



k. S (V. 166; C. 60). Gotland. 



/. $ (V. 172 ; C. 58). Sweden. 



m~n. 5 (V. 165, 168 ; 0. 



63, 60). 

 o-,s. S (V. 175; C. 71), 



2 (V. 165, 169; 0.64, 



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



C. 76, 72). 

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



? (V. 176; 0.60). 

 V. Yg., two-headed 



monster. 

 w. Ad., skel. 

 X, y. Skulls. 



Near St. Malo 

 Bologna. 



Ilisk, E. Turkestan. 

 Paris. 



Dr. Eiaen [P.]. 



G. J. A. Thuden, Esq. 



[P.]. 

 G. A. Bouleuger, Esq. 



[P.]. 

 Prof. Bianconi [P.]. 



Rev. H. Lansdell [0.]. 



B. Collar altogether absent, or reduced to a small black blotch on 

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



a. $ (V. 157 ; 0. 60). Oorunua. M. V. L. Seoane fP.! 



6. c? (V. 166; 0. 77). Albufera de Va- Lord Lilford [P.J. 



lencia. 



