1220 REPORT OF NATIONAL MUSEUM, 1898. 



Zamenis Jiagellum Shaw. 

 Compsosoma corais couperii Holbrook. 

 PityopMs melanoleucus Daudin. 

 Ophibolus getulus getulus LiuniBUS. 

 Osceola doliata coccinea Schlegel. 

 Osceola elapsoidea Holbrook. 

 Storeria dekayi Storer. 

 Natrix fas data erythrogaster Shaw. 

 Natrix cyclopium Dumeril and Bibron. 

 Natrix taxispilotus Holbrook. 

 Eutmnia sirtalis sirtalis Liimneus. 

 Tantilla coronata Baird and Girard. 

 Elaps fulvius Linnieus. 

 Sistriirxs miliarius Linnieus. 

 Crotalus adamantcus adamanteus Linnteus. 

 The total number of species of the Floridan subregion is as follows: 



Peculiar species 15 



Species common to the Ocmulgian district 1 



Species common to the Lonisianian district 40 



Species common to the West Indian region 3 



Little known species 2 



Total 61 



IV. THE SONORAN SUBREGION. 



This subregion presents several natural divisions, as follows: I. The 

 Lower Cali/ornian district, including only the region at the extremity 

 of the peninsula of Lower California; II. The Chihuahuan district^ 

 embracing the State of Sonora, Mexico, the northern part of the Mexican 

 Plateau, Arizona south of the San Francisco Mountains; most of the 

 peninsula of Lower California, and most of New Mexico; III. The 

 Basin district, embracing the Great Basin of Utah and Oregon, to Ver- 

 non, British Columbia; and IV. The Central district, which includes 

 the high plains east of the Rocky Mountains, from Texas northward, 

 excei)ting the river bottoms which cross it from west to east. This 

 great subregion is bound together by the general distribution of numer- 

 ous genera; but I do not know a single species which covers its entire 

 area which is not found elsewhere. These define the districts. 



The Lower Californian district is defined by the following fourteen 

 species, which are restricted to it : 



Ilyla curta Cope. 



Gtenosaura hcmilopha Cope. 



Cfta thalassina Cope. 



Uta nigricauda Cope. 



Phyllodactylus nnctus Cope. 



Gnemidopliorus maximns Cope. 



Euchirotes hiporus Cope. 



Liclianura trivirgata Cope. 



Zamenis aurigiilus Cope. 



