126 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



in surveying the lower portion of this tract with a view to reclaiming 

 and utilizing it for agricultural purposes. I was here from March 

 5 to 13, 20 to 21, and 31 to April 1, 1894 ; Mr. Holzner from March 

 5 to 13 and 31 to April 1, 1894. 



Reptiles of the Colorado River, from the mouth of the Gila to the 

 Gulf of California. — Most of the lizards and snakes named in the 

 following list were first collected at Fort Yuma by Maj. George H. 

 Thomas (who became major-general during the civil war and to 

 whose enthusiastic efforts science is also indebted for the first knowl- 

 edge of the Fort Yuma ground squirrel, Sfermofhilus tereticaudrcs 

 Baird, and other animals of the region). Others who have gathered 

 reptiles in the Yuma region are Dr. A. L. Heermann, Arthur Schott, 

 H. B. MoUhausen, R. O. Abbott, Charles R. Orcutt, and the nat- 

 uralists of the U. S. Fish Commission : 



Lisards. 



Dipsosaurus dorsalis (Baird and Gl- 



i-ard). 

 Sauromalus ater Dumfiril. 

 Callisaiirus draconoides ventralis (Hal- 



lowell). 

 Vma rufopunctata Cope. 

 Ota stansiufiana Baird and Girard. 

 Vta ornata Baird and Girard. 



Vta symmetrica Baird. 

 Vta graoiosa (Hallowell)'. 

 Sceloporus clarkii Baird and Girard. 

 Anota maccalUi Hallowell. 

 Eublepharis variegatus (Baird). 

 Cnemidophorus tessellatus tessellatus 

 (Say). 



Snakes. 



Glaucoma humilis (Baird and Girard). 

 Zamensis flagelluvi flagellum (Shaw). 

 Zamensis semilineatus Cope. 

 Ophtbolus getulus boylii (Baird and 



Girard). 

 Eutqmia megalops Kennicott. 



Eutamia elegans marciana (Baird and 



Girard). 

 Crotalus adamanteus atrox (Baird and 



Girard). 

 Crotalus cerastes Hallowell. 



Turtles. 



Gopherus agassizii (Cooper). 



Kinosternon sonoriense Le Conte. 



The range of the large land turtle (Gopherus agassizii) extends up 

 the Colorado, at least to the Nevada line, where I found it in 1884. 

 The Sonoran mud turtle {Kinosternon sonoriense) I do not remember 

 to have seen below Gila City, on the Gila River. A large marine 

 turtle was taken by Miguel, our Cocopah Indian hunter, near the 

 mouth of the Colorado River and the head preserved in alcohol 



Station No. 68.— Colorado River, at Monument No. 204 (western 

 edge of the Yuma Desert), 855 kilometers (531 miles) west of the 

 Rio Grande; altitude, 27 meters (89 feet). This camp was beside 



