On a new Frog and a new Snake from Formosa. 221 



Lacertilia. 

 13. Agama atricollis, A. Smith. 



a. Kana Eiver. 



This was shot on the branch of a tree. It has a curious 

 habit of dodging one around the branch or trunk of the tree 

 upon which it may happen to be. As soon as the present 

 example saw me it ran round to the other side of the branch, 

 and only by getting my " boy " to approach from the opposite 

 side was I able to see it again and shoot it. 



14. Varanus niloticus, L. 



A half-grown monitor belonging to this species was shot 

 on the bank of a creek of the Shangani River. On another 

 occasion I watched one swimming in the water. It propelled 

 itself slowly by means of its tail, while the limbs were used 

 to keep its balance, in a similar manner to a person treading 

 water. 



Ophidia. 



15. Boodon lineatus, D. & B. 



a. Gwamayaya River, 13th Nov., 1908. 

 Shot on the bank of the river. 



16. Thelotornis Jeirtlandii, Hallow. 



a. Swena's, Gwamayaya River, 23rd Nov., 1907. 



b. Near Gwamayaya River, 24th Nov., 1907. 

 Both shot on the ground away from water. 



XXII. — Descriptions of a new Frog and a new Snake from 

 Formosa. By G. A. Boulexger, F.R.S. 



Rhacophorus moltrechti. 



Vomerine teeth in two strong, slightly oblique, transverse 

 series touching the inner front edge of the choanse and sepa- 

 rated by an interspace less than the length of one of the 

 series. Head moderately depressed, a little broader than 

 long; snout rounded, slightly projecting beyond the lower 

 jaw ; canthus rostralis obtuse, loreal region deeply concave ; 

 nostril equally distant from eye and from end of snout ; intei- 

 orbital space a little broader than the upper eyelid ; tympanum 

 moderately distinct, two-thirds the diameter of the eye. 

 Fingers rather short, outer half webbed, the disks as large as 



