148 



CALIFORNIA ACADEMY OF SCIENCES. 



with a number from Southern California,* and found not 

 appreciably different, except that the Lower Californian 

 snakes seem to have the black markings at the bases of 

 the dorsal and lateral scales often larger and more nu- 

 merous. Even this character is, however, rather incon- 

 stant, and there seems, therefore, to be no reason for 

 making the separation tentatively suggested by Dr. Stejne- 

 ger.t 



The type came from Mountain Spring, Colorado Des- 

 ert, San Diego Co., California. Mr. Xantus found the 

 species at Cape San Lucas. The three specimens col- 

 lected by Mr. Belding at La Paz, and recorded by Dr. 

 Yarrow under the name B. jlagellifomie testaceum, doubt- 

 less belong here. 



List of specimens of Bascanion flagellum frenatum. 



Cal. Acad. 

 Sci.No. 



Locality. 



Date. 



Collector. 



483 



San Jose del Cabo, L. C. 



April 4, 1892 



Gustav Eisen. 



484 



" 



April, 1892 



W. E. Bryant. 



535 



" 



Sept. 30, 1890 



" 



602 



" 



Oct. 6, 1890 



" 



610 



" 



Sept. 4, 1890 



" 



658 



Lower California. 



1889 



" 



793 

 to 

 799 



San Jose del Cabo, L. C. 



Sept., 1893 



Gustav Eisen. 



849 



" 



" 



(I 



866 



" 



Oct., 1893 



" 



1571 



to 



1577 



" 



Sept., 1894 



Eisen and Vaslit. 



1618 



" 



" 



" 



1183 



Miraflores, L. C. 



" 



" 



1184 



" 



" 



" 



* One of these specimens, from Yosemite Valley, Cal., has a single anal 

 plate. 



+ N. A. Fauna, No. 7, 1893, p. 20S. 



