126 



BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



ill 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. 



RejMles of the Colorado Rivei\ 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 eiforts science is also indebted for the first knowl- 

 edge of the Fort Yuma ground squirrel, SpermophHus tereticaudus 

 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. Mollhausen, R. O. Abbott, Charles R. Orcutt, and the nat- 

 uralists of the U. S. Fish Commission : 



Lizards. 



DipHomunis dorsolis (Baird and (Ji- 



rard). 

 Sawomaliis atcr Dium'Til. 

 CallisdKnis (Iraconoitlcs vciitr<iHi< (Ilal- 



lowoll). 

 Unia riifopiiiictatu Cope. 

 Uta stanshuridiia Baird and (iirard. 

 L'ta onialu Baird and Girard. 



Uta symmetrica Baird. 

 Uta graciosa (Ilallowell). 

 Sccloponis chtrkii Baird and (Jirard. 

 Anota ))iacca]Iii Hallowell. 

 ]Jiil>1ci)hari!< raricgafu-'^ (Baird). 

 Cncmidophorua tcsscUatii.s tes-srllutus 

 (Say). 



Snakes. 



Ghntcoiiiii hiiiiiili.s (Baird and Girard). 

 Zuiiicnsis flagcUum pageUum (Shaw). 

 Zaiiicuxi>i scntilhieatuK Cope. 

 Ophiljolus gctuhts hoi/Ui (Baird and 



Girard). 

 Eiit(riiia iiicgdJops Kennieott. 



UiitiOiia clcfnois nuirciiuiu (r>aird and 



Girard). 

 Vrotulua adamuntcu'i utror (Baird and 



Girard). 

 Crotalus cerastes Hallowell. 



Turtles. 



(Idplicnis (ig<issi.zii (Cooper). 



Kiiiosicnioii soiioriciisc Le Conte. 



The range of the large land turtle (Go/>herus ayassizi'i) extends up 

 the Colorado, at least to the Nevada line, where I found it in 1S,S4. 

 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 Xo. G8. — 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 



