1924] Swarth: Birds and Mammals of the Skeena River Region 363 



began to disappear. The last to be positively identified as such was 

 seen on September 9, biit Alaska myrtle warblers arrived from the 

 north in mimbers a day or two later and the two species are sufficiently 

 alike so that a few Audubon warblers might have lingered somewhat 

 latet and been overlooked. 



Thirteen specimens collected (nos. 42482-42494) : nine summer 

 adults (six males, three females^, three males in first winter plumage, 

 and one male in juvena] plumage. These birds were taken at the 

 northernmost points at which the Audubon warbler has been found. 

 Two hundred miles farther north, in the Telegraph Creek region, it is 

 replaced bj'^ the Alaska myrtle warbler, there near its southern limit 

 (see Swarth, 1922, p. 289). Comparing the two series, auduboni from, 

 the tipper Skeena Valley and hocmeri from the upper Stikine Valley, 

 there cannot be seen the least approach of one to the other. Specimens 

 of audv.boni from its northern limit are exactly like others from Cali- 

 fornia ; specimens of hooveri from its southern limit show no departure 

 from the characters of specimens from northern Alaska. The two 

 species, though closely related, evidently preserve their distinctness 

 where their ranges most closely adjoin. It would be interesting to 

 ascertain if there is any place between Hazelton and Telegraph Creek 

 where both species breed. A hybrid between the two has been 

 described (Taylor, 1911). 



Dendroica magnolia (Wilson). Magnolia Warbler 



Fairly common summer visitant to the lowlands about Hazelton, 

 where it arrived June 3. In Kispiox Valley, June 21 to July 15, it 

 was decidedly rare, not more than five or six birds being seen in that 

 period of time. At the same place when the migration began, the third 

 week in August, magnolia w^arblers became more numerous and they 

 were seen daily up to the first week in September. Last noted on 

 September 5. Six specimens collected (nos. 42495-42500), two adult 

 males, one adult female, two immature males, one immature female. 



Dendroica striata (J. R. Forster). Black-poll Warbler 



Two immature males (nos. 42501-42502), migrants, were collected 

 in Kispiox Valley on August 18 and September 1, respectively. No 

 others' were seen. 



