124 



BULLETIlSr 56, UNITED STATES NATIONAL MUSEUM. 



Of snakes, several individuals of Chiloinoiisvas c'tncttm Cope, and 

 a great many of Crotalus cerastes Hallowell, were seen, and a speci- 

 men of each taken. 



Station No. 05. — Gila River at Adonde Siding, on the Southern 

 Pacific Railroad. This station, on the lower Gila, is about 37 kilo- 

 meters (23 miles) north of Monument No. 195. Altitude, 60 meters 

 (197 feet). The Gila Valley is wide at this part. Where the foot- 

 hills approach the valley a few giant cacti were seen. The bottom- 

 land and adjacent arroyos support a growth of arrowwood, Baccha- 

 7'is, stramonium, cocklebur, and coarse sedges and rushes along the 

 sloughs. The trees are cottonwood and willow beside the Gila, with 

 ironwood, large-leaved palo verde, mesquite, screw-bean, acacia, and 

 Parosela spinosa farther back. The mesquites are loaded with mis- 

 tletoe. The loose soil of the Gila river bottom is covered with a 

 plant having fleshy leaves, which ranges along the Gila and Colorado 

 rivers to the Gulf of California. Uta stanshuriana of Baird and 

 Girard Avas common, and the only lizard taken; and Kinosternon 

 sonoriense of Le Conte was the only turtle. I made collections at this 

 station from February 11 to 23, 1891. 



Station No. GG. — Gila River at Gila City, Yuma County, Arizona. 

 Station 10 kilometers (25 miles) north of Monument No. 199. Alti- 

 tude, 50 meters (1(J0 feet). At this point the Gila Mountains close 

 in upon the Gila Valley. The stream, as usual, is bordered by cot- 

 tonwood and willow trees. Mesquite and screw bean are the com- 

 mon trees of the river bottom; ironwood, acacia {A. r/reggii), 

 Ephedra, large-leaved palo verde, ocotillo, and the giant cactus 

 occupy the foothills and arroyos; and smaller cacti and shrubs 

 occur on the mountains. Along the Gila River are numerous sloughs, 

 bordered with cat-tail, tule, cane, sedge, and rush. One species of 

 gourd had a tuberous root, measuring one-third by one meter. Inter- 

 esting collections of plants, fishes, birds, and mammals were made 

 from March 1 to 5, 1894, by the Avriter and Mr. Holzner. 



Flora of lower Gila Hirer. — BetAveen Adonde and Yuma the mate- 

 rial collected is indicated in the lists that follow. 

 The trees are: 



Salix nigra Marshall. 



Salix fluviatiJis Nuttall. 



PopuJus fre))io)itii Watson. 



Acacia greggii Gray. 



Prosopis odor at a Tori'ey ami Fremont 



Prosopis glandidosa Torrey. 



Cercidiuvi torreyanum (Watson) Sar- 

 gent. 

 Parosela spinosa (Gray) Heller. 

 Olneya tesota Gray. 

 Cereus giganteus Engelmann. 

 ^ambucus glauca Nuttall. 



Other coarse plants are of the genera Ephedra, Typha, Phoradeii- 

 dron, Atriplex, Amaranthas, Opuntia (subgenera Platopuntia and 



