28 BULLETIN 19 9, UNITED STATES NATIONAL MUSEUM 



Genera. — About four, of which one occurs in Mexico. 

 Range. — World-wide in tropical and subtropical areas, except the 

 East Indies and Australia. 



Genus GOPHERUS Rafinesque 



Gopherus Rafinesque, Atlantic Journ., vol. 1, 1832, p. 64. 

 Genotype. — Testudo polyphemus Daudin. 

 Range. — Southern United States and northern Mexico. 

 Species. — Three recognized, two of which occur in Mexico. 



KEY TO MEXICAN SPECIES OF GOPHERUS " 



1. Carapace dome-shaped, rounded on top; carapace length about twice shell 



height (47-56 percent) berlandieri (p. 28) 



Carapace with flat-topped contour; carapace length more than twice shell 

 height (36-48 percent) agassizii (p. 28) 



GOPHERUS BERLANDIERI (Agassiz) 



Xerobates berlandieri Agassiz, Contributions to the natural history of the United 

 States, vol. 1, 1857, p. 447; vol. 2, 1857, pi. 3, figs. 17-19. 



Testudo berlandieri, Boulenger, Catalogue of the chelonians, rhynchocephalians 

 and crocodiles in the British Museum, 1889, p. 156. 



Gopherus berlandieri, Stejneger, North Amer. Fauna, No. 7, 1893, p. 161. 



Type. — U.S.N.M. No. 60, two specimens. 



Type locality. — Lower Rio Grande, Tex., here restricted to Browns- 

 ville. 



Range. — Nuevo Le6n, Tamaulipas, and Coahuila ^*; in United 

 States: Southern Texas. 



GOPHERUS AGASSIZII (Cooper) 



Xerobates agassizii Cooper, Proc. California Acad. Sci., vol. 2, 1863, p. 125. 



Testudo agassizii, Boulenger, Catalogue of the chelonians, rhynchocephalians 

 and crocodiles in the British Museum, 1889, p. 156. 



Gopherus agassizii, Stejneger, North Amer. Fauna, No. 7, 1893, p. 161. — Wood- 

 bury and Hardt, Ecol. Monogr., vol. 18, 1948, pp. 145-200, figs. 1-25. 



Type. — Unknown . 



Type locality, — Mountains near Fort Mojave, Calif. 



Range. — Baja California, Sonora including Tibur6n Island; in the 

 United States, southeastern California and southwestern Arizona 

 north into Nevada and Utah. 



Family EMYIDAE '' Gray 



Emyidae Gray, Ann. Fhilos., ser. 2, vol. 10, 1825, p. 210. 



" From Woodbury and Hardy, Ecol. Monogr., vol. 18, 1948, p. 152. 



1* Duges's record (La Naturaleza, ser. 2, vol. 1, 1888, pp. 146-147; vol. 2, p. 479) from Bolson de Mapimf, 

 Chihuahua, cannot be authoritatively allocated. It may be referable to this species. 



i» See Dermochelyidae (p. 13) for a discussion of orthography of family names. The present family has 

 as its type the genus Emys, not the genus Emyda Gray, 1831, which belongs to the family Trionychidae 

 (a homonym, Emyda Rafinesque, 1815, long overlooked but of earlier date, belongs to the Emyidae, but 

 being a substitute for the generic name Emys, it is not available). 



