AST. 12 



REVISION OF LIZARDS OF GENUS CTENOSAURA BAILEY 



21 



found in all four localities. These specimens, therefore, are all referred to the 

 one species, Ctenosaura hemilopha. Femoral pores in specimens from San Este- 

 ban Island vary from 5 to 8; in those from San Pedro Nolasco Island, from 6 

 to 9; in 10 from Ceralbo Island, from 6 to 8; in 50 from the cape region, from 

 4 to 7. 



The writer examined the types of Ctenosaura insulana and conspic- 

 uosa and could find no characters that are not included in the nor- 

 mal individual variations of hemilopha. 



Three young specimens belonging to the United States National 

 Museum (No. 13484), collected at Guaymas, on the west coast of 

 Sonora, and labeled '^ Ctenosaura multispinis" are hemilopha. Another 

 specimen, U.S.N. M. No. 17178, &\so]&he]ed" Ctenosaura multispinis," 

 and said to have been collected at Nogales, Ariz., is a three-fourths 

 grown male of hemilopha. Concerning the latter the United States 

 National Museum catalogue record shows that it was " brought into 

 town by a boy who was leading it around by a string." George B. 

 Marsh procured the specimen from the boy, and turned it over to 

 P. L. Jouy, who sent it to the Museum at Washington. 



The three young specimens from Guaymas were in all probability 

 reared in that vicinity, the original stock having been taken there by 

 travelers from one of the islands of the Gulf of California or from 

 the mainland of Lower California. The Arizona record is very 

 doubtful. 



Material examined. — 



