in the Collection of the British Museum. 357 



numerous lai-ge, more or less regular, black spots on the upper 

 parts, and smaller ones on the belly. Our specimen is 37 inches 

 long, the tail measuring 8 inches. 



Xenurophis. 



Body rather slender, rounded ; tail elongate, strong, with two 

 series of very large shield-like scales above, so that there are 

 only four series of scales nearly from its root ; head of moderate 

 length and width ; eye large. Loreal present ; one pr?e-, two 

 post- oculars. Scales smooth, in fifteen rows. Ventrals less than 

 200, without keel ; subcaudals two-rowed. Maxillary teeth of 

 equal length, smooth. 



Xenurophis Ceesar. PI. VI. fig. C. 



Scales perfectly smooth, in fifteen rows. Body rounded, rather 

 elongate ; tail long, not compressed ; head of moderate length 

 and width ; eye large. One large prseocular, just reaching to 

 the upper surface of the head ; two high, narrow postoculars ; 

 eight low upper labials, the fourth and fifth of which enter the 

 orbit; temporals 2-r3, of moderate size. Occipitals scarcely 

 longer than the vertical, rounded and slightly divergent behind. 

 Two pairs of elongate chin-shields, the anterior in contact with 

 five lower labials. Ventrals 145, rounded, without keel ; anal 

 bifid ; subcaudals ? The maxillary teeth are closely set, nu- 

 merous, equal in size, and forming one continuous series. Upper 

 parts brownish olive, with 28 narrow, greyish, black-edged 

 cross streaks extending to the belly : these bands are less distinct 

 on the tail. Six yellow dots disposed in a ring on the crown of 

 the head. Two oblique, yellow, black-edged bands on each side 

 of the hinder part of the head, — one commencing from the post- 

 oculars, and descending to the angle of the mouth, the other 

 from the occipital to the side of the neck. Lower parts uniform 

 yellowish. 



This beautiful snake is from Fernando Po. The single speci- 

 men we have observed has the tail injured; but a sufficient por- 

 tion of it is preserved to show that it is of considerable length. 

 Length of the cleft of the mouth 10 lines, of the trunk 18^ in., 

 of the remaining portion of the tail 5 inches ; probable length 

 of the entire tail 9 inches. 



Dromicus callilamus. 

 Natrix callilcBma, Gosse. 

 Scales in 19 rows, without apical groove. Head slightly de- 

 pressed, of moderate width and length ; rostral shield not quite 

 as high as broad, just reaching the upper surface of the snout ; 

 anterior frontals one-third the size of posterior. Vertical five- 



