108 BULLETIN 56, -UNITED STATES NATIONAL MUSEUM. 



As the stream is broadly bordered by trees, and the av^jacent country 

 covered by mesquite and brushwood, this river valley is an ideal col- 

 lecting ground. I was there October 28 and 29, 1893, and collected 

 a few birds and mammals. 



Station No. 45.— Santa Cruz River, 25 miles south of Tucson, 

 Arizona; altitude, 865 meters (2,838 feet). I collected specimens 

 October 29 and 30, 1893. 



Station No. 46.— Tucson, Arizona; altitude, 736 meters (2,415 

 feet). No place in Arizona has as rich a fauna; and there is con- 

 siderable variety to the flora. The Santa Cruz Valley is well wooded 

 with Cottonwood, willow, mesquite, and cultivated fruit trees. I 

 collected there in April and May, 1885 ; also, October 30 to Novem- 

 ber 30 and December 11 to 12, 1893. Mr. Holzner was there from 

 October 30 to November 5 and November 17 to 28, 1893. 



Flora of Tucson, Arizona. — This fertile field has been well cov- 

 ered by visiting botanists and by Prof. James William Toumey, of 

 the University of Arizona, at Tucson. The following list includes 

 the common trees seen by me on my brief visits, when I was the re- 

 cipient of many favors and polite attentions on the part of President 

 Comstock and Professor Toumey, of the university, and of Mr. 

 Herbert Brown, of Tucson, all of whom imparted much useful in- 

 formation respecting the local fauna and flora : 



Yucca sp. 

 Yucca sp. 



8alix nigra Marshall. 

 Salix occidentalis longipes (Anders- 

 son) Bebb. 

 Populus fremontii Watson. 

 Celtis occi(lentaUs~'LinnaiUS. 

 Acacia greggii Gray. 

 Prosopis glandulosa Torrey. 

 Prosopis oclorata Torrey and Fremont. 

 ParJcinsonia microphylla Torrey. 

 KcBberlinia spinosa Zuccarini. 



Melia azedarach umbraculifera Sar- 

 gent. 



Nicotiana glauca Graham. 



Acer negundo Linnaeus. 



Cereus giganteus Engelmann. 



Opuntia fulgida Engelmann. 



Opuntia versicolor Coulter. 



Opuntia spinosior (Engelmann) Tou- 

 mey. 



Fraxinus velutina Torrey. 



Chilopsis linearis (Cavanilles) Sweet. 



Sambucvs glauca Nuttall. 



The vegetation in the region about Tucson presents an extremely 

 picturesque appearance. The streams — Rillito Creek and the Santa 

 Cruz Eiver — are well wooded with screw bean, mesquite, cotton- 

 wood, willow, boxelder, and ash, groups of which are often converted 

 into fragrant bowers by climbing grape and PhiliberteUa, with spiny 

 asters, showy daturas, and many flowering annuals beneath and 

 around them. The foothills of the Tucson and Santa Catalina moun- 

 tains are sprinkled Avith the giant cactus. Going toward the Santa 

 Catalinas, one emerges upon a plain sloping up to the intervening 

 valley of Rillito Creek. The foreground is spread with prickly pear 

 and the gregarious creosote bush, which, in season, is covered with 

 yellow flowers. Patches of arborescent cacti cover much of the 



