210 University of California Publications in Zoology [Vol. 12 



both productive foraging grounds and safe retreats. It was rarely 

 that this wren was seen near the river, and then only as far as the 

 salt-bush belt. The range of the western house wren in the willow 

 association appeared to be not at all impinged upon by that of the 

 desert Bewick wren. This again shows the local dissociation of birds 

 of the same or nearly the same habits, even in their winter habitats. 

 It is to be inferred that there are inherent preferences of the two 

 species for cover of the two different sorts. 



The desert Bewick wren was observed on the California side five 

 miles below Needles, opposite The Needles, and in the lower Cheme- 

 huevis Valley; on the Arizona side in the vicinity of Mellen, at the 

 foot of The Needles, and above Bill Williams River. At least one 

 specimen was secured at each of the above points. The last for the 

 season were observed March 21 at Riverside Mountain. The series of 

 nine specimens (nos. 13827-13835) are uniform in their exhibition 

 of the characters assigned to this race by its original describer (Ober- 

 holser, 1898, p. 427). The great length of tail alone serves to dis- 

 tinguish Thryomanes bewicki eremopliihis from any of the other seven 

 forms of bewicki occurring within the state of California (Grinned, 

 1910, p. 309). The Colorado Valley birds are with a high degree 

 of probability visitants from a summer habitat lying on the higher 

 desert mountains in the vicinity of Death Valley, California and 

 Nevada, where this form has been recorded as breeding (Oberholser, 

 1898, p. 429). 



There are in the Museum three skins (nos. 4280—4282) of this wren 

 taken by J. G. Cooper at Fort Mohave, January 1, March 6 and 21, 

 1861. 



Troglodytes aedon parkmani Audubon 

 Western House Wren 



Common as a winter visitant to the river bottom only, and even 

 here confined almost exclusively to the willow association. Not one 

 individual was seen anywhere on the desert proper. The species was 

 noted in the willow thickets near Needles, February 15, and thence- 

 forth at all stations, on both sides of the river, until the last of March. 

 At Ehrenberg but one was noted (and obtained) March 29. The last 

 for the season was seen April 9, a single individual, in a pile of drift 

 on the river bank on the Arizona side ten miles below Cibola. 



Five specimens preserved (nos 13836-13840). 



