1905. ] ON MEXICAN AMPHIBIANS AND REPTILES. 191 
The Larks and Pipits were, on the whole, very scarce. An 
extremely handsome Glossy Starling was a very conspicuous bird, 
which seemed to like the neighbourhood of camps. The White- 
necked Crow and the fine Razor-billed Raven were especially 
common in the west; and it was in the cattle country and on 
the Ruchigga Mountains that the Tick-birds (Buphaga) were 
observed, although some were seen following large herds of 
elands in Bukanga and Mpororo, and the rhinoceros in Karagwe. 
Perhaps the most noticeable feature in the bird-life was the 
extraordinary number of Francolins of every species to be seen in 
Bukanga, very valley and almost every patch of dry grass 
appeared to contain a large number of these birds. In the 
evenings, when the grass had been burnt in patches, numbers of 
Francolins could be observed feeding in the open like pheasants 
outside a cover in September at home. It would have been easy 
to have shot forty or fifty brace a-day if time and cartridges had 
been available. 
2. The Distribution of Mexican Amphibians and Reptiles. 
By Hans Gavow, F.R.S., F.Z.S. 
[Received May 17, 1905.] 
(Text-figures 29-32.) 
CoNnTENTS. 
Introduction, p. 191. 
List of Species collected by H. G., p. 198. 
Physical Features of the Localities, p. 196. 
Review of the Distribution of Cecilia, p. 199. 
= : Urodela, p. 200. Summary, p. 204. 
39 29 
Se F Anura, p. 205. ss p. 208. 
. os Crocodilia, p. 209. 3 p. 209. 
s i Chelonia, p. 209. 4 p. 210. 
- = Lacertilia, p. 211. 5 p. 220. 
Ophidia, p. 222, 55 p. 226. 
33 3) 
Distribution according to Altitude, p. 227. 
List of Species occurring in High Altitudes, p. 232. 
General Conclusions :—Evolution of Middle America, p. 234.. 
Immigration and Spreading, p. 238. 
Northern and Southern Immigrants, p. 241. 
INTRODUCTION. 
These investigations are based upon a considerable material 
which it is convenient to enumerate :— 
1. The volume on Reptilia and Batrachia, by Dr. Giinther, of 
the ‘ Biologia Centrali-Americana,’ with its thousands of references 
to localities, 
2. Cope’s posthumous work, ‘The Crocodilia, Lizards, and 
Snakes of North America,’ Rep. U.S. National Museum for 1898. 
3. Boulenger’s Catalogue, with the lists of ever-increasing 
additions, of the Collection in the British Museum of Natural 
History. 
4. Collections made by Dr, Meek during his ichthyological 
