1911] Sivarth: Alasl-a Expedition of 1909. 61 



12) is just finishing the molt into the fully adult, presumably 

 the second winter, plumage, and is more heavily marked than 

 any other example of the species at hand. The lower surface is 

 chestnut, with the transverse barring reduced to disconnected 

 spots, except on the abdominal region ; the tibiae uniform chest- 

 nut, entirely without barring. The adult female is not quite so 

 heavily marked. 



An examination of the available series of sharp-shinned 

 hawks in adult plumage reveals the fact that these two Alaska 

 birds, together with some winter specimens from California, 

 are much darker than other winter specimens from California, 

 as well as those from Arizona, Nevada and Illinois. It seems 

 possible that there is a recognizable, dark, northwest coast race 

 of the sharp-shinned hawk, which in winter ranges at least as 

 far south as southern California, where it occurs together with 

 the paler colored, more southern form; but the material at hand 

 is too scanty to enable me to arrive at any definite conclusions. 



Astur atricapillus striatulus Ridgwa^-. Western Goshawk. 



On Kuiu Island, April 25, a goshawk was seen pursuing a 

 flock of mallards. The species was not met with again until we 

 reached Thomas Bay, where, on August 14, Hasselborg saw two, 

 apparently fighting, and shot both, but lost one in the thick 

 underbrush. A single bird secured on the Taku River, Sep- 

 tember 13, completes the list of records. This bird had just 

 finished eating a Steller jay. 



The two birds secured (nos. 9770, 9771), both males in the 

 first winter plumage, are extremely dark colored dorsally, and 

 heavily marked with black on the lower surface, being exactly 

 similar to the single specimen secured on Baranof Island by the 

 1907 Expedition (see Grinnell, 1909, p. 211). It is interesting to 

 note, however, that a bird in the Grinnell collection, also in 

 immature plumage, collected at Sitka, August 5, 1895 (see 

 Grinnell, 1898, p. 127) is apparently to be referred to A. 

 atricapillus atricapillus, as it is indistinguishable from specimens 

 of the latter from the Yukon Valley, Alaska. 



Buteo borealis alascensis Grinnell. Alaska Red-tailed Hawk. 

 Apparently not common in this region, as we noted the species 



