1916] Dice: Land Vertebrates of Southeastern Washington 



303 



occur and one or the other is dominant, depending on whether the 

 region is dominated by sagebrush or bunchgrass. In general the 

 habitat is strikingly arid. 



The species of the rocky-slope association are few in number and 

 represent species which in general show a fondness for the neighbor- 

 hood of rocks. 



In ten traps set among rocks on a steep hillside three miles south- 

 east of Wallula one Peromzyscus maniculatus gambelii was_taken on 

 June 16, 1914. 



WILLOW HABITAT AND ASSOCIATION (SAGEBRUSH AREA) 



Exclusive : 



Colinus virginianus virginianus 



resident. 



Asio wilsonianus resident. 

 Otus asio macfarlanei summer. 

 Colaptes cafer collaris summer. 

 Corvus brachyrhynchos hesperis 



summer. 

 Molothrus ater artemisiae 



summer. 

 Melospiza melodia merrilli 



resident. 



Zamelodia melanocephala summer. 

 Passerina amoena summer. 



Major : 



Zenaidura macroura marginella : 



summer. 



Tyrannus tyrannus summer. 

 Tyrannus verticalis summer. 

 Pica pica hudsonia resident. 

 Icterus bullocki summer. 



Minor: 



Thamnophis elegans. 



Reported : 



Pituophis catenifer catenifer. 



Dendroica aestiva aestiva 



summer. 



Icteria virens longicauda summer. 

 Dumetella carolinensis summer. 

 Penthestes atricapillus septentrion- 



alis resident. 

 Planesticus migratorius propin- 



quus summer. 

 Sorex vagrans dobsoni. 

 Reithrodontomys megalotis 



nigrescens. 

 Mus musculus musculus. 



Euphagus cyanocephalus 



summer. 



Mephitis occidentalis major. 

 Peromyscus maniculatus gambelii. 

 Thomomys columbianus. 



Sylvilagus nuttallii nuttallii. 

 Erethizon epixanthum epixanthum. 



The timber found along the Walla Walla River near Wallula is 

 made up largely of willows (Salix) of several species. Cottonwoods 

 (Populus trichocarpa) are rare and so are many of the shrubs which 

 grow along the streams nearer the Blue Mountains. The habitat is 

 limited in extent and does not usually extend more than a few rods 

 from the banks of the river, when it ceases abruptly and gives place to 

 the sagebrush. The willows are mostly small in size and grow very 



