150 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



13. Ctenosaura acanthura (Shaw). 



A single example from Progreso, as well as a large series from Chichen- 

 Itza. 



Following Giinther (Biol. Cent.-Amer., Rept., 1890, p. 56) we have placed 

 these examples under this species. Ives (Proc. Phil. Acad. Nat. Sci., 1891, 

 p. 459) records Yucatan examples under the name C. cycluroides Harlan. 



14. Ctenosaura (Cachryx) defensor (Cope). 



One example from Chichen-Itza. 



According to Boulenger (Proc. Zool. Soc. London, 1886, p. 241) Cope's 

 genus Cachryx is untenable because it has been shown to intergrade with 

 Ctenosaura. Still its characters would seem sufficiently definitive to warrant 

 the subgeneric use of the name. 



15. Sceloporus chrysostictus Cope. 



Three examples from Chichen-Itza, four from Progreso, and one from San 

 Ignacio, taken on Feb. 9. 



16. Sceloporus serrifer Cope. 

 One example taken March 15, at Chichen-Itza. 



17- Sceloporus variabilis Wiegmann. 



Eighteen examples from Progreso. 



18. Cnemidophorus sexlineatus (Linne). 



Sixteen examples from Chichen-Itza, nine from Progreso. 



The specimens show very marked variability in size, marking, and squama- 

 tion. We have the typical form as well as examples agreeing with descrip- 

 tions of the varieties mexiccmus, angusticeps, and costatus which Boulenger 

 recognizes. For several specimens we would need to describe new sub- 

 species were we to admit any to be different from the forma typica. It must 

 be said, however, that among the large number which we have both taken and 

 seen in Florida, no such variability ever occurs. 



OPHIDIA. 



19. Glauconia albifrons (Wagler). 



One example from Chichen-Itza, collected in the Maya ruins by Mr. E. H. 

 Thompson. 



A second example has also been received, taken by Mr. E. H. Thompson at 

 the same locality, date uncertain, but between 1890 and 1900. 



20. Typhlops microstomus Cope. 

 One example, also from the Maya ruins near Chichen-Itza. 



