414 COLTJBRIDJE. 



Snout obtuse, feebly projectino;. Rostral broader than deep, just 

 visible from above ; upper surface of snout with numerous small 

 shields ; frontal broken up into three shields ; loreal and temporal 

 regions covered with numerous small scales ; upper labials 14 or 15, 

 separated from the eye by a series of suboculars ; six lower labials 

 in contact with the anterior chin-shields ; posterior chin-shields 

 narrow and separated from each other by two series of scales. 

 Scales smooth, in 41 or 43 rows. Yentrals 263 ; anal entire ; sub- 

 caudals 100, Pale buff above, with blackish spots which are rect- 

 angular and transverse on the anterior part of the body ; a blackish 

 streak along each side of the neck and another from the nostril to 

 the angle of the mouth, passing through the eye ; yellowish white 

 interiorly. 



Total length 1230 millim. ; tail 240. 



Persia (Laristan and Shiraz). 



55. LYTORHYNCHUS. 



Heterodon, part., Dmn. Si- Bibr. Erp. Gen. vii. p. 764 (1854). 

 Simotes, part., Gimth. Cat. Col. Sn. p. 28 (18-58) . 

 Lytorhvnchus, Peters, Mon. Berl. Ac. 1862. p. 272; Boidenr/. Ann. 

 'Sc Mar/. N. H. (5) xx. 1887, p. 414, and Faun. Ltd., Bept. p. 322 

 (1890). 

 Chatachlein, Jan, Arch. Zool. Anat. Phys. ii. 1863, p. 228. 

 Acontiopliis, Giintk. Proc. Zool. S'oc 1875, p. 232. 

 Catachlajna, Blnnf. Proc. Zool. Soc. 1881, p. 678. 

 PhvllorhyucbuR, Stejneger, Proc. U.S. Nat. Mus. xiii. 1890, p. 151; 

 Cope, Proc. U.S. Nat. Mus. xiv. 1892, p. 617. 



Maxillary teeth 6 to 9, posterior much longer than anterior ; 

 mandibular teeth subequal. Head slightly distinct from neck, with 

 cuneiform projecting snout ; eye moderate, pupil vertically elliptic ; 

 rostral large, fotir-sided, projecting, concave inferiorly ; nostril an 

 oblique slit between two nasals. Body elongate, cylindrical ; scales 

 smooth or feebly keeled, without apical pits, in 19 rows ; veutrals 

 obtusely angulate laterally. Tail moderate or short ; subcaudals in 

 two rows. 



jS^orth Africa and Asia, from the Algerian Sahara to Syria, 

 Transcaspia, Afghanistan, and Sind ; Arizona and Lower California. 



Synojisis of the Species. 



I. Internasals forming a suture behind the rostral ; two pairs of 

 chin-shields. 



End of snout truncate ; a pair of prse- 



frontals ; two labials entering the eye . . 1. cliadema, p. 415, 

 Snout pointed ; a single pra^frontal ; no 



labial entering the eye 2. ridye^vayi, p. 415, 



Snout pointed; a pair of pra^frontals ; one 



labial entering the eye 3, paradoxus, p. 416. 



