Cope.] "VQ [June 20, 



caudal scutolla two-rowed. Teeth equal. Cephalic shields normal. Nasals 

 distinct, and separated by a space from the single preocular, which is occu- 

 pied by the prefrontal, since the loreal is wanting. Head little distinct from 

 body. Rostral plate not produced. The absence of loreal plate is the only 

 character that separates this genus from Tropidoclonium. 



Char, specif. Total length, 33 centimetres ; tail very acute and termi- 

 nating in a cone ; length of tail, M.00f>6. Cephalic scales convex ; dor- 

 sals and supra caudals carinate, those on the flanks smooth. Urosteges 

 divided ; a single preanal. A single preocular and two post-oculars ; 

 temporals three (1 -f 2). Superior labials five, the first in contact with the 

 two nasals and the rostral ; the second is in contact with the posterior 

 nasal and frontonasal ; the third is in contact with the frontonasal, the 

 preocular and the eye ; the fourth is in contact with the eye and the in- 

 ferior post-ocular ; the fifth and largest is in contact with the inferior post- 

 ocular, the first temporal and the inferior temporal of the second row. 

 There are two nasals ; the nostril piercing the posterior border of the an- 

 terior one The rostral projects very slightly above the level of the muzzle. 

 No frenal, the frontonasals extending on the sides till in contact with the 

 superior labials. The internasals are small, triangular. The frontal or 

 vertical is much longer than wide, and is six-sided. Palpebrals (supra- 

 oculars) are elongated, straight; occipitals large. Five inferior labials on 

 each side, and a small mental. Four elongate inframaxillaries, the ex- 

 tremity of the posterior ones angulated and separated by two small gulars. 

 Three rows of gulars on each side. 



I have counted fifteen dorsal rows of scales longitudinally; the rows in 

 contact with the gast03teges the largest and smooth, those on the back 

 and upper side of tail carinated, rhombic and truncated (emarginate) at 

 their extremities. The preanal is undivided. 



On the middle of the back there is a yellowish line extending from the 

 occiput to the commencement of the tail, which embraces two rows of 

 scales. On each side of this line a chestnut-brown band of the same width 

 as the former, which is bordered below by a black line ; the line is lost in 

 the tail, and behind the eye it forms an elongate black spot. The flanks 

 and belly are light brown ; there is a black line on the posterior margin of 

 each of the scales in contact with the gastrosteges ; towards the tail they 

 disappear. The upper side of the head is chestnut and the lips are like the 

 flanks in color, very yellow. 



Habitat, Guadalajara, Mexico. 



21. Phimothyra bairdi Jan., 9883. 



22. Lytorhynchus Mexico nun D. & B. Zamenis D. & B. Eupataro. 



23. Bascanium tmniatum later ale Hallow. 



24. Eutmnia cyrtopsis Kenn , 9892. 



25. Eutosnia sirtalis Linn., 9899. 



2G. Hypstglena ochrorhynchus Cope, 9889. 

 27. Trimorphodon upsilon Cope, 9911-12. 

 Elaps fulvius L. 



