302 University of California Puhlicatiom in Zoology [^ol. 24 



situation. The nest was about four feet from the ground, between 

 four upright willow branches, and there was no concealing green 

 growth about it. The material used was mostly dried weed stems, 

 grass, and shreds of bark. The lining differs from the outer structure 

 only in that it consists of finer material of the same sort. Dimensions 

 of this nest are as follows : greatest outside diameter, 170 mm. ; inside 

 diameter, 68 ; outside depth, 100 ; inside depth, 40. It contained foul- 

 eggs, partly incubated. 



A second nest was collected on June 19, essentially like the first 

 except that it is less bulky. This was in an alder, about four feet 

 from the ground, alongside a seldom used road, and again in a most 

 exposed situation. The set was of four eggs. On June 19 still another 

 nest was found, in a crotch in a dead willow, about eight feet up. In 

 this one there are more and coarser bark strips used, and a good deal 

 of the cottony fiber from the fireweed pods. It contained five eggs. 

 The last occupied nest was found at Doch-da-on Creek, July 21, con- 

 taining three eggs nearly ready to hatch. This was in an alder, about 

 three feet from the ground. In the case of the nest last described, the 

 parent bird, presumably the female, was in great distress and did not 

 go very far away. With each of the others, the sitting bird slipped 

 unobtrusively away and did not return until some time had elapsed, 

 probably never under twenty minutes. 



At Great Glacier, August 11, a young bird was collected, not yet 

 able to fly, that is clearly referable to swadnsomi. This last record is 

 of considerable interest as it carries the breeding range of swainsoni 

 westward in this region to a point about thirty miles from the coast, 

 the habitat of Hylocichla u. 9,stulafa. Although the habitats of the 

 two subspecies thus approach so closely, there is no evidence of inter- 

 gradation of characters between them. In the Stikine River series of 

 swainsoini there is not one specimen of an equivocal character. On the 

 contrary, these birds, like those from the Yukon region, show an ex- 

 treme of grayness, compared with typical swainsoni from eastern 

 North America, that carries them farther from usiulata in appearance 

 than are specimens from the Atlantic coast. (In this connection see 

 Oberholser, 1898, p. 305.) It may be pointed out also that although 

 ustulatat and siminsom breed in different parts of northern California, 

 there is no section of that state that is known to be occupied by birds 

 of intermediate character. As in the Stikine region, both occur in 

 typical form quite to the margins of their respective habitats. Thus, 

 if ustulata and swainsoni are to be regarded as two subspecies of one 



