MAMMALS OF THE MEXICAN BOUNDARY. 



97 



326 kilometers (202 miles). A hilly region, covered with volcanic 

 scoria, sparsel}'' clothed with grass and brushwood, with a few red 

 juniper trees. Within a radius of a dozen kilometers (7 miles) a 

 range of altitude from 1,200 to 1,640 kilometers (3,940 to 5,380 feet) 

 could be found. Station occupied by myself September 1 and 11, 

 1892 ; August 14 to 17 ; and October 7, 1893, Plants, birds, etc., were 

 collected. 



Flora of Cerro Gallardo. — The trees and plants obtained near this 

 station are named in the following lists. 



The trees are : 



Junipcrufi monosperma (Engeliiiann) 

 Sargent. 



Yucca hrevifolia Torrey. 



Salij! tdxifolia Humboldt, Bonpland, 

 and Kunth. 



Quercus arizonica Sargent. 



Celtis reticulata Torrey. 



Morns celtidifolia Humboldt, Bon- 

 pland, and Kunth. 



Platan us irrightii Watson. 



Acacia constricta Bentbam. 

 Acacia greggii Gray. 

 Prosopis sp. 



Eysenliardtia ortlwcarpa (Gray) Wat- 

 son. 

 Kceberlinia spinosa Zuccariui. 

 Sapindus marginatus Willdenow. 

 Bumelia rigida (Gray) Small. 

 Fraxinus velutina Torrey. 



Other shrubs and conspicuous plants are; 



Ephedra trifurca Torrey. 



Yucca baccata Torrey. 



Nolina lindheimeriana (Scheele) Wat- 

 son. 



Dasylirion tvheelert Watson. 



Agave palmer i Engelmann. 



Cucurbita foetidissima Humboldt, Bon- 

 pland, and Kunth. 



Cucurbita digitata Gray. 



Apodanthera undulata Gray. 



Miniusa biuncifera Bentbam. 



Mimosa lindheitneri Gray. 



Mimosa dysocarpa Bentbam. 



Tre- 



Mimosa graliami Gray. 



Acacia filiculoides (Cavanilles) 



lease. 

 Cassia %Dislizeni Gray. 

 Erythrina flabelliformis Kearney. 

 Krameria parvifolia Bentbam. 

 Fouquieria splendens Engelmann. 

 Covillea tridentatu (de Candolle) 



Vail. 

 Rhus virens Lindheimer. 

 Opuntia of subgenera PUitopuiitia and 



CyUudropuDtia. 

 Baccharis ghitinosa Persoon. 



Station No. 28. — Agua Prieta Ranch, Pieclras Negras, Sulphur 

 Spring Valley. Monument No. 85, distant from the Rio Grande 

 338 kilometers (210 miles). Altitude, 1,204 meters (3,950 feet). 

 Occupied by myself September 11 and 12, 1892; August 14; and Octo- 

 ber 7, 1893; by Mr. Holzner, September 11 to 12, 1892. This broad 

 valley, though crossed several times, was not carefully examined, and 

 the collections made were small. 



Vegetation. — The ground is part bare and part grassy, with exten- 

 sive patches of the gregarious creosote bush {Cooillea tridentata)^ 

 and considerable greasewood (Atriplex), with some cacti. Soapweed 

 (Yucca glauca) and a narroAv-leaved yucca^having a long caudex 

 were sometimes seen ; and some superb hackberr}' trees formed a 

 grove on an arroyo at the west side of Sulphur Spring Valley, at 

 30639— No. 56—07 M — -7 



