On a new Gecko and a new Snake from Sumatra. 281 
1915, and were given to Mr. La Touche, who kept them alive 
in captivity till December 1916. Unfortunately confinement 
somewhat damaged the specimens, their hair becoming unduly 
worn, especially on the tails and hind feet. Nevertheless, I 
think there can be no doubt about their representing a 
distinct species. The area in which they were collected is 
divided from the Ordos Desert, the home of Dipus sowerbyi, 
by a wide stretch of country occupied more or less by moun- 
tains and hills, often of a well-wooded nature, where no form 
of jerboa exists. The discovery of this form in North-eastern 
Chibhli marks a further eastward extension of the known 
range of Dipus by another 500 miles, and it is possible that 
it extends even further to the extreme eastern edge of the 
Mongolian desert, where that country comes into contact 
with Manchuria. 4 
XXXVIII.— Descriptions of a new Gecko and a new Snake 
Srom Sumatra. By G. A. BouLENGER, F.R.S. 
(Published by permission of the Trustees of the British Museum.) 
A SMALL collection made by Mr. C. J. Brooks, the discoverer 
of the remarkable Bornean Dyscophid frog Colpoglossus 
brooksit, described in these ‘Annals’ in 1904, in Sumatra 
between 1912 and 1917, and presented.by him to the British 
Museum, contains examples of the following species, some of 
which (marked with an asterisk) have not been recorded 
from Sumatra before :— 
BATRACHIANS: Ichthyophis glutinosus, L., Bufo jerboa, 
Blgr.*, Rhacophorus leucomystax, Gravenh. 
REPTILES: Gecko stentor, Cant., Gecko brooksii, sp. n.*, 
Ptychozoon homalocephalum, Crev., P. horsfieldii, Gray *, 
Draco obscurus, Blgr.*, Mabuia rugifera, Stol., Lygosoma 
vittigerum, Blgr.*, Typhlops nigroalbus, D. & B., Xenopeltis 
unicolor, Reinw., Tropidonotus trianguligerus, Boie, T. con- 
spicillatus, Gthr., Lyeodon albofuscus, D. & B., Coluber mela- 
nurus, Schleg., Dendrophis pictus, Gm., Simotes purpurascens, 
Schleg., S. octolineatus, Schn., Calamaria alide, sp. n.*, 
Nata tripudians, var. leucodira, Blzgr. 
The locality is Lebong Tandai in Benkoelen. 
Geeko brooksii, sp. n. 
Body elougate; head once and three-fourths as long as 
