266 Zoological Society : — 



groups, which, as far as I can see, only differ in the elongation of 

 the tail in the latter. 



Second List of Siamese Reptiles. By Dr. Albert 

 GiJNTHER, For. Mem. Zool. Soc* 



Having examined the Saurians, Ophidians, and Batrachians of M. 

 Mouhot's collection, lately transmitted from Chartaboum, on the 

 coast of Siam, to this country, I shall first describe the new species, 

 and then add a complete list of the whole series. Typical specimens 

 of them have been retained for the British Museum. 



1. Draco TiENioPTERUs. 



Tympanum not scaly ; nostrils above the face-ridge, directed up- 

 wards ; a low longitudinal fold on the neck. Scales on the back of 

 equal size, obscurely keeled. Gular sac covered with large smooth 

 scales, uniformly coloured. Wings dark-greenish olive, with five 

 arched black bands, not extending to the margin of the wing, some 

 being forked at the base. 



2. ACANTHOSAURA CORONATA. 



The upper orbital edge serrated, without elongate spine poste- 

 riorly ; a short spine on each side of the neck ; a yellowish-olive band, 

 edged with black across the crown, from one orbital edge to the 

 other ; an oblique, short, yellowish band, broadly edged with brown, 

 from below the orbit to the angle of the mouth. 



This and the following species belong to the genus Acanthosaura, 

 as defined by Dr. Gray (Catal. Liz. p. 240). The tympanum is di- 

 stinct ; a short spine between it and the dorsal crest, which is rather 

 low. No femoral or prseanal pores. A short spine behind the orbital 

 edge, and separated from it by a deep notch. Back and sides co- 

 vered with small, smooth scales, slightly turned towards the dorsal 

 line, and intermixed with scattered larger ones, which are keeled ; 

 belly and legs with larger, keeled scales. Tail slightly compressed 

 at the base, the rest being round and without crest ; all its scales 

 are keeled, those on the lower side being oblong and provided with 

 more prominent keels. Throat without cross-fold and without di- 

 stinct longitudinal pouch ; a slight oblique fold before the shoulder. 



3. Acanthosaura capra. 



The upper orbital edge not serrated, terminating posteriorly in a 

 long moveable horn ; no spine above the tympanum or on the side of 

 the neck. Nuchal crest high, not continuous with the dorsal crest, 

 which is elevated anteriorly. Crown and cheek without markings. 



The tympanum is distinct ; no femoral or praeanal pores. Back 

 and sides covered with small, smooth scales, which become gradually 



* 1 take this early opportunity of remarking that I have convinced myself of 

 the correctness of Messrs. Dumeril and Jan's observation with regard to the den- 

 tition of Herpeton (see * Annals,' ser. 3. vol. vii. p. 195). The groove of the pos- 

 terior maxillary tooth can be distinctly seen even in the transparent teeth of fresh 

 specimens, like those in the British Museum, when viewed with a strong magnifier 

 from the front of the mouth. — Gunther. 



