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80 



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

 Avithin the Texau district is uot certain, as the Hue separating the latter 

 from the Louisiauian district is not well known. The ISpclcri)es mitlti- 

 pUcatus, 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 I ejond the borders of the Austroriparian region 



V'^ Species which range along the Mississippi Valley and not east- 

 ward of it— 13 : 



Urodela. 



Amblystoma microstomum (E.). 



Ophidia. 



Carphophiops helenae. 

 Virginia elegans. 

 Ophibolus calligaster (E.). 

 Coluber emoryi (E.). 

 Eutaenia faireyi (E.). 

 Eutaeuia proxima. 

 Tropidonotus grahamii (E.). 

 Tropidonotus rhombifer. 



Testudiiiata. 



]Macrochelys lacertina, 

 Pseudemys troostii. 

 Malacoclemmys geographica (E.). 

 Malacoclemmys pseudogeographica (E.). 



The Texan district of the Aufitroriparian regiou is not the range of 

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

 Louisiauian district, many of which are represented hy correspond- 

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

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

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

 three appear to be, so far as known, peculiar, Ortyx tc.mnu.s, Virci 

 atricapillus, and Mih'ulus forjicatus. Many iMexican birds are found ou 

 the Kio Grande, while a few enter Texas to a greater distance, as Ictcrm 

 parisonon. The high northwestern regions of the State should be 

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

 {CaUipcpla squamata and Cyrtonijx massena) and the linch {Peucaeit 

 cassinii). ( 



