1022 The American Naturalist. [December, 
Of these species the following occur in the Chihuahuan 
district : 
Amblystoma tigrinum Green. Onemidophorus guttatus B. & 
Spea hammondii Bd 
Hyla arenicolor Cope. 
Sceloporus scalaris Wiegm. 
Sceloporus microlepidotus 
Wiegm. 
Epiglottophis pleurostictus D. 
&B 
Eutænia macrostemma Kenn. 
Eutænia eques Reuss. 
The Austroriental district includes the mountainous region 
which bounds the Mexican Plateau on the east, from some part 
of the State of Puebla to a point to the north not yet ascer- 
tained. It is probably separated by a considerable interval 
from the Austroriparian in the States of Tamaulipas and 
Nuevo Leon. Its climate is moist, and vegetation is abundant, 
and of principally Medicolumbian type. Various peculiar 
species of Acer, Platanus, Quercus, Andromeda and other forms 
are abundant. The Batrachian and Reptilian species are the 
following : * 
BATRACHIA URODELA: SAURIA: 
Spelerpes chiropterus Cope. 
Spelerpes leprosus Cope. 
Spelerpes cephalicus Cope. 
Spelerpes orizabensis Blatch- 
ey. 
Spelerpes  gibbicaudus 
Blatchley. 
Oedipina lineola Cope. 
Thorius penuatulus Cope. 
BATRACHIA SALIENTIA: 
Hyla gracilipes Cope. 
Smilisca baudinii D. &. B. 
Sceloporus variabilis Wiegm. 
Sceloporus æneus Wiegm. 
Sceloporus microlepidotus 
Wiegm. 
Phrynosoma orbiculare 
Wiegm. 
Phrynosoma taurus Dugés. 
Barissia imbricata Wiegm. 
Barissia antauges Cope. 
Gerrhonotus gramineus 
Cope. 
p 
Gerrhenetne tæniatus 
legm 
Gerrhonotus lioc eph alus 
iegm. 
3 For a knowledge of the ar arg of many of these species I am indebted 
is Sumichrast, in i Soe in Seatac ae Che 
1873, p. 233, and in litteris. 
