PARKMAN'S WREN. 131 



forefeet brush the whiskers, ears, eyes, and head 

 in general, I suppose, to remove particles of dirt 







accumulated in passing through the tunnel. 



It is curious to note how three species of 

 ground-squirrels have replaced each other in 

 accordance with the change of vegetation in our 

 transit from the Dalles to where we are now en- 

 camped. 



At the Dalles we saw SpermopTiilus Douglassii, 

 the Columbia Ground Squirrel (described in 

 vol. i.), extending only as far as the scrub-oak 

 grew, the Fall river being its boundary going 

 north towards Colville. 



Betwixt the Fall river and the Spokan, inhabi- 

 ting the sandy and woodless plains, Richardson's 

 Ground Squirrel (S. Richardsonii, Cuv.) is alone 

 found. After crossing the Spokan and getting 

 into the timbered regions, the ground-squirrel I 

 have been looking at takes its place, and extends 

 from the Spokan to the slopes of the Rocky 

 Mountains. 



July 9. To-day we have a charming drive 

 through grass and open timbered land, like a 

 succession of beautiful parks. Cross several 

 small streams, icy cold, but clear as crystal. 

 By these rivulets I noticed Parkman's Wren 

 (Troglodytes Parkmannii, Aud.). 



K 2 



