8o CALIFORNIA ACADEMY OF SCIENCES. 



Phyllodactylus tuberculosus, Bascanion flagelhim frenatum, 



Dipsosaurns dorsalis, Thamnophis cyrtopsis collaris, 



Uta stansbnriana, Natrix valida, 



Kena humilis, Trimorphodon lyrophanes, 



Hypsigleua ochrorhyncha, Crotahis atrox, 



Salvadora grahamiffi, Crotalus mitchellii. 



Formulating these data we have the following tables : 



GENERA . 



Total number in the Sonoran Subprovince 40 



Confined to the Sonoran Subprovince 11 



Total number in the "Cape Region " 29 



Bestricted to the " Cape Region " 1 



Common to the "Cape Region " and Tropical America 1 



Common to the "Cape Region " and the Sonoran Subprovince 26 



SPECIES. 



Total number in the Sonoran Subprovince 78 



Confined to the Sonoran Subprovince 57 



Total number in the " Cape Region " 38 



Restricted to the ' ' Cape Region " 22 



Common to the " Cape Region " and Tropical America 



Common to the "Cape Region " and the Sonoran Siibprovince 12 



From these it appears that the affinities of the reptiles 

 which inhabit southern Lower California are almost en- 

 tirely with those of the Sonoran Subprovince, of which 

 the "Cape Region," therefore, forms a part. It is also 

 shown that a strongly characterized center of reptilian 

 distribution is located in the terminal part of the penin- 

 sula, entitling it to rank as one of the minor constituent 

 life areas or faunse of the Sonoran Subprovince. For 

 this area Dr. Allen has already proposed the name "Saint 

 Lucas Fauna." 



It is unfortunate that so little material has been col- 

 lected on that part of the peninsula which is just north of 

 La Paz, for on this account the northern limit of this San 

 Lucas Fauna cannot, at present, be determined with ac- 

 curacy. A sufficient number of specimens has been ob- 

 tained, however, to show that this fauna is apparently re- 

 stricted to the rather mountainous area south of La Paz. 



