80 



The genus Virginia occurs within the State of Texas, but whether 

 within the Texan district is not certain, as the line separating- the latter 

 from the Louisiauian district is not well known. The SpeUrpes miilti- 

 plicatus, a rare salamander from Western Arkansas, is in the same way, 

 of uncertain reference. 



The species of the following list have a peculiar range, some of them 

 (marked E) extending beyond the borders of the Austroriparian region 



V*^. Species whi(;h range along the Mississippi Valley and not east- 

 ward of it — 13 : 



TJrodela. 



Amblystoma microstomum (E.). 



Opliidia. 

 Carphophiops helenae. 

 Virginia elegans. 

 Ophibolns calligaster (E.). 

 Coluber emoryi (E.). 

 Eutaenia faireyi (E.). 

 Eutaenia proxima. 

 Tropidonotus grahamii (E.). 

 Tropidonotus rhombifer. 



Testudinata. 



Macrochelys lacertina. 

 Pseudemys troostii. 

 ]ytalacoclemmys geographica (E.). 

 Malacoclemmys pseudogeographica (E.). 



The Texan district of the Austroriparian region is not the range of 

 any genus not found elsewhere, but possesses the peculiar genera of the 

 Louisianian district, many of which are represented by correspond- 

 ing and peculiar species. Seventeen such species of reptiles may be 

 enumerated, besides a salamander and a toad. Several species of mam- 

 mals are also peculiar to it, i. e., five rodents and two skunks. Of birds, 

 three appear to be, so far as known, peculiar, Ortyx tcxanus, Vireo 

 atricapillits, and Milvulus forficatus. Many Mexican birds are found on 

 the Rio Grande, while a few enter Texas to a greater distance, as Icterus 

 parisorum. The high northwestern regions of the State should be 

 assigned to the Sonoran fauna, as the range of the two partridges 

 {Callipepla squamata and Cyrtonyx massena) and the finch [Peucaea, 

 cassinii). 



