1006 The American Naturalist. [December, 
Hyla andersonii Bd. Ophibolus rhombomaculatus 
Rana virgatipes Cope. Holbr. 
To these must be added from the Austroriparian list: 
Abastor erythogrammus Daud. 
The following a are peculiar to the Transalleghenian 
district : 
Chondrotus microstomus Cope. Eutenia radix B. & G. 
Spelerpes maculicaudus Cope. Eutænia butlerii Cope. 
Rana areolata circulosa R. & D. Tropidoclonium lineatum Hal- 
Carphophiops vermis Kenn. low. 
Coluber vulpinus B. & G. Natrix kirtlandii Kenn. 
Ophibolus calligaster Say. Systrurus catenatus Raf. 
Probably Hutaenia brachystoma Cope betongs to this district 
but only one specimen has been found. 
The following species enter this district only from the Aus- 
troriparian : 
Natrix grahamii B. & G. | Eutænia proxima Say. 
Of the species peculiar to the Transalleghenian district, Ophi- 
bolus calligaster and Tropidoclonium lineatum extend into the 
northern limits of the Texan district. 
The genera which do not range northward of the Cisalle- 
ghenian district are Cnemidophorus, Liolepisma and Abastor. 
The total number of species of the Eastern subregion is thus: 
Generally distributed, 
Peculiar to Cisalleghenian, 
Peculiar to Transalleghenian, 
Peculiar to Canadian, 
Common to Austroriparian, 
IV. THE AvsTRORIPARIAN SUBREGION. 
This subregion is the range of a large number of species of 
Batrachia and Reptilia, only a part of which occupy it to the 
exclusion of all other subregions, and another series of whi 
occupy parts only of its area. Three centers of distribution 
° 
