1909] The 1907 Alexander Alaska Expedition. 243 
showing characters of the two parentages asymmetrically, as in 
the case of certain hybrid flickers. The locality, Glacier Bay, is 
almost at the north extremity of the Sitkan District, the home of 
caurinus, and pretty close to the known range of true migrato- 
rius, so that hybridization is wholly possible. 
The three adult females of cawrinus are much paler colored 
than the males, and closely resemble breeding females of migra- 
torius. 
Robins were not uncommon in portions of the region ex- 
plored. At Windfall Harbor, Admiralty Island, according to 
Dixon, ‘‘a flock of about a dozen stayed around the mouth of the 
ereek,’’ April 17 to May 19. At Mole Harbor, May 19 to June 
10, one was shot and two others seen by Stephens. On Baranof 
Island, one was shot and others seen at Red Bluff Bay June 11 
to 20, and at Rodman Bay one was seen the middle of August. 
On Chichagof Island they were common on the mountain 
side above timber-line near Hooniah. A brood of young were 
found there June 23. At Idaho Inlet, July 20 to 25, several 
were noted feeding on salmon berries. And again at Port Fred- 
erick, the last week in July robins were common. At Glacier 
Bay an adult and young were secured July 8. 
Ixoreus naevius naevius (Gmelin). Varied Thrush. 
On Admiralty Island this bird was fairly common at Wind- 
fall Harbor, April 17 to May 19. Stephens saw a female carry- 
ing nest material on April 23. At Mole Harbor it was rather 
common, May 19 to June 10; and at the chain of lakes near 
there, during the same interval, Dixon several times saw birds 
carrying food to their young. The same collector saw one at 
Hawk Inlet, August 5. Eight specimens, all adults, were taken 
on Admiralty Island (Nos. 424-430, 461). 
At Red Bluff Bay, Baranof Island, Littlejohn and Stephens 
secured six skins June 14 to 16 (Nos. 434-439). At Rodman 
Bay the species was detected August 12 to 20. 
At Hooniah, Chichagof Island, Dixon noted several as seen 
and two taken June 24 (Nos. 400, 451). One was a full-fledged 
juvenal caught in a rat trap. At Glacier Bay, Dixon states that 
old nests were abundant all through the woods at Coppermine 
