19H] Grinnell: Mammals and Birds of tlu Colorado Valley 209 



adjacent cavities, was paved with flat pieces of stone about an inch 

 in diameter. The nest itself was out of reach. Several rock wrens 

 were observed among the hills twenty miles north of Pieacho. On 

 April 16 a bird was observed to fly into a cranny with a bill full of 

 insects, thus indicating young at this date. A bird taken on the 

 hillside near Potholes, April 27, showed evidences that the breeding 

 season was past. 



Five specimens were secured (nos. 13841-13845). 



There are also in the Museum two skins (nos. 4277, 4278) taken 

 by J. 6. Cooper at Fort Mohave, January 31 and February 10, 1861. 



Catherpes mexicanus conspersus Ridgway 

 Canon Wren 



Observed only where precipitous rock walls furnished the ideal 

 environs for the species, and only sparingly then. At least three 

 pairs were located on the river side of the pinnacles constituting The 

 Needles, and one specimen obtained March 5. Another pair was 

 observed on the California side opposite. The song was heard repeat- 

 edly as we passed through the whirlpool canon just below The Needles. 

 Again met with in deep, narrow ravines in some red conglomerate 

 hills above Bill Williams River, where one example was taken March 15 

 and another seen. From the canon walls on either side of the river 

 in its course immediately below the mouth of Bill Williams River, the 

 song of this wren came often to our ears as we drifted along. 



March 17 and 18 cafion wrens were heard in ravines well up on 

 Riverside Mountain. As none were seen after the latter date, although 

 other favorable localities were visited, it is possible that the species is 

 only a winter visitant to the region from the higher desert ranges in 

 the Death Valley region. Still it is known to breed in similar localities 

 in the same life-zone elsewhere. 



The two examples secured (nos. 13848, 13849) are doubtfully 

 referred to conspersus. Lack of material prevents a satisfactory study 

 of the case. 



Thryomanes bewicki eremophilus Oberholser 



Desert Bewick Wren 



Common as a winter visitant to the region. Observed chiefly in 

 the sparse brush margining the washes leading down from the desert 

 interior. The catclaw and larger creosote bushes appeared to afford 



