'2i0 MR. A. W. E. O'SHAUGHNESSY ON [Feb. 1, 



scales and in the single lateral series of large scales. M. Bocourt's 

 description particularizes " deux rangees longitudinales de chaque 

 cote de la crete dorsale ;" aud his figure of the general scutellation 

 of the sides indicates about 29 scales vertically between the belly 

 and the dorsal crest, and larger scales intermixed with these every- 

 where. 



Sexual characters are well shown in the series of specimens before 

 me. 



The male has a larger head aud longer hind limbs, reacliing to 

 the eye, while in the female they do not extend beyond the tym- 

 panum. A different system of coloration also prevails, the female 

 being of darker brownish and more variegated tints and without the 

 dark gular patch. 



16. Enyalius pr^stabilis, sp. n. (Plate XXV. fig. 1.) 



Head broad, with rounded and projecting lateral border of about 

 20 canthal and superciliary scales in a continuous series, almost 

 uniform in shape and size. Entire upper surface of the head 

 covered with very convex or pointed and erect scales, larger in the 

 crescentic series bordering the supraorbital region ; larger conical 

 scales above the temporal region. Supralabials 10, infralabials 9, 

 uniform. Gular scales convex, elongate, the central erect. The 

 back and sides of the body are covered with small almost uniform 

 pointed and keeled scales, from 34 to 40 in a vertical series between 

 the abdominal scales and the dorsal crest. Only a single very in- 

 distinct lateral series of larger scales on each side. A longitudinal 

 crest of conical erect scales from the nape, along the median line of 

 the back, and continued anteriorly on the tail, where it gives place 

 to a double row or keel of pointed scales. Scales of the ventral 

 surface small, uniform, smooth on the chest, and very feebly keeled 

 on the middle of the abdomen ; of the limbs small and keeled. A 

 single femoral pore in a large scale on each side. Tail compressed, 

 ringed with small keeled scales on the sides and larger beneath. 



Female with a shorter head than the male, and considerably 

 larger scales on the sides of the body. The male also has the tail 

 much thicker at its root and longer hind limbs, reaching to the eye, 

 while those of the female reach only to the anterior border of the 

 ear-opening. 



Ground-colour of the upper regions of the body, iu the male, 

 reddish, very finely speckled with green ; posterior gular region 

 and gular fold hlack ; lower surfaces yellowish. The female has 

 the ground-colour above dark brown, thickly dotted over with green ; 

 tail brown- aud yellow-ringed ; lower surfaces yellowish, without 

 gular patch. A yellow spot on a patch of conical scales behind the 

 ear in both sexes. 



millim. 



Total length (of male) 318 



Distance between end of snout and ear-opening . . 34 

 ). )> „ fore limb . . 56 

 .. >i „ vent 1 26 



