1896.] Distribution of Batrachia and Reptilia. 1021 
The humid and dry districts of the Toltecan subregion re- 
peat in petto the differences between the Austroriparian and 
Sonoran subregions. The Austroriental district is distin- 
guished by the larger number of batrachian genera and spe- 
cies, and of certain genera of Crotalide. It also includes some 
genera which may be regarded as immigrants from the Cen- 
tral American region of the Neotropical Realm. 
The characteristic species of the Austrocentral district are? : 
BATRACHIA URODELA: 
Siredon mexicanum Shaw. 
Amblystoma tigrinum Green. 
BATRACHIA SALIENTIA : 
Bufo compactilis Wiegm. 
Bufo intermedius Gthr. 
Spea multiplicata Cope. 
Spea hammond Bd. 
Hyla eximia Bd. 
Hyla arenicolor Cope. 
Rana montezumae Bd. 
TESTUDINATA : 
Kinosternum pennsilvani- 
cum. 
Onychotria mexicana Gray. 
SAURIA : | 
Phrynosoma orbiculare 
Wiegm. 
Sceloporus scalaris Wiegm. 
Sceloporus microlepidotus 
Wiegm. | 
Sceloporus torquatus Green. 
Sceloporus minor Cope. 
Sceloporus melanogaster 
Cope. 
Barissia imbricata Wiegm. 
Cnemidophorus guttatus B. 
&G 
Eumeces brevirostris Gthr. 
SERPENTES : 
Conopsis nasus Gthr. 
Toluca lineata Kenn. 
Chionactis varians Jan. 
Salvadora bairdii Jan. 
Epiglottophis pleurostictus 
D. & B. 
Hemigenius variabilis 
Dugés. 
Natrix storerioides Cope. 
Eutænia macrostemma 
Kenn. 
Eutænia eques Reuss. 
Eutænia pulchrilatus Cope. 
Eutænia scaliger Jan. 
utænia melanogaster 
Wiegm. 
Tantilla bocourtii Gthr. 
Tantilla calamarina Cope. 
Crotalus basiliscus Cope. 
Crotalus polystictus Cope. 
* For the exact habitat of several of these Iam indebted to the important papers 
of Dr. A. Dugés, in La Naturaleza, 1888, p. 97, and 1896 p. 3. 
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