SILYBURA MACROLEPIS. 189 



SILYBURA. 



Siluboura, Gray= Silyburaj Peters. 



Tail subcylindrical, the scales on its upper posterior side being shield-like 

 and provided with one or several keels, forming together a flattish disk 

 which terminates in a horny, bispinous, horizontal scale. Head more or less 

 conical ; nasal shields forming a suture together behind the rostral ; supra- 

 orbital and postocular confluent into one shield. 



Peninsula of India. 



Synopsis of the Species. 



* Scales in fifteen ro^ys 5. macrolepis, p. 189. 



** Scales in seventeen rows ; rostral longer than vertical S. beddomii, p. 190. 



*** Scales in seventeen i-o« s ; rostral shorter than vertical. 



Ventrals 199-203 S. ocelluta, p. 190. 



The lovFcr part of the tail is completely encircled by a yellow band; 



ventrals 143-168 S. elliotti, p. 190. 



A yellow band along each side of body and tail ; vertical shield square . S. bicatenata, p. 191. 

 The fourth upper labial much longer than high ; ventrals 139, nearly twice 



as broad as the scales ; tail with a yellow liand only along the side . S. shorttii, p. 191. 



Ventrals 122 S. brevis, p. 192. 



SiLTBURA MACROLEPIS. (Plate XVII. fig. B.) 



Silybura macrolepis, Peters, Monatsber. Berl. Acad. 1861, p. 904. 



Snout obtusely conical ; rostral shield without keel above, shorter than the vertical. 

 Caudal disk flat, well defined, twice as long as broad ; each scale of the disk with one or 

 two keels. Scales of the middle of the body in fifteen rows; ventral shields 137 ; nine pairs 

 of subcaudals. The circumference of the thickest part of the body is contained ten times 

 and a half in the total length. Black : a broad, irregular, yellowish band along each side 

 of the front part of the trunk ; traces of a similar narrow band are visible along the sides of 

 the body ; a yellow band along each side of the lower part of the tail. 



The single specimen known is a female, 10|- inches long, and probably a native of the 

 peninsula of India. 



The head is represented in two views on Plate XVII. 



