14 



inrll. lin. 



Haunch plate, from its anterior to its pos- "i o 10 

 terior margin above the tail. ... J 



Length of tail 6 9 



Circumference of its basal ring, from which it "I An 



rapidly tapers to a slender point / 

 Number of dorsal bands 7 . 



In a small specimen of D. Peba, measuring from nose to root of 

 tail 1 foot 2|- inches, the ears measure li inch in length; and in a 

 somewhat larger specimen (from nose to root of tail, 1 foot 3 inches) 

 Ifth inch. 



In the smaller specimen of D. Peba the extent of the shoulder plate 

 is 2| inches, — of the haunch plate 4 inches. 



The length of the head Z^ inches, and the distance from the an- 

 terior angle of the eye to the end of the nose, 2|- inches. 



Tail imperfect, but much longer than in D. hybridus. 



Between D. hybridus and D. Peba, independently of the differences 

 in the proportion of the ears and length of snout, the characters ex- 

 hibited by the scutellce of the plates are very distinct. In D. hybridus 

 the scutellce of the helmet are of moderate size, those in the centre 

 of the upper part being elongated, and many sub-triangular, the rest 

 occupying the space between the eyes and downwards are of an ir- 

 regular figure, some nearly square, others pentagonal and hexagonal. 

 In D. Peba the scutellce are not only much larger, but of a more de- 

 finite figure, being mostly hexagonal, with sides of unequal length. 



In D. hybridus the scutellce of the shoulder plate consist of ele- 

 vated oval tubercles in transverse rows, the intervals being filled with 

 smaller, very irregular, and less elevated granuli. The same obser- 

 vation applies to the haunch plate, in which the elevated oval scu- 

 tellce are remarkably distant and large, while somewhat smaller and 

 flatter scutellce form a rosette round each. In the D. Peba the larger 

 scutellce of this plate are round, and are encircled by others of very 

 small size. 



In D. hybridus the ears are delicately granulated, — in D. Peba 

 coarsely. 



As respects the Das. minutus there can be no possibility of con- 

 founding it with the D. hybridus. 



Mr. James Reid exhibited to the Meeting, and characterized as 

 new, under the name of Obscurus, a dark-coloured monkey, from 

 the Societj''s collection, belonging to the genus Semnopithecus. 

 The locality of the particular specimen before the Meeting was 

 unknown. 



