306 University of Calif ormia Publications in Zoology ["Vol. 24 



At Flood Glacier, our next stopping place down stream, robins 

 abruptly became very scarce. Call notes were heard on July 29, but 

 the birds were not seen. At Great Glacier, too, there were very few 

 around. Two seen, but not obtained, on August 11, were the only 

 ones noted. 



Nine specimens (nos. 40318-40326) were collected on the upper 

 Stikine River, at Telegraph Creek, Glenora, and Doch-da-on Creek. 

 The series comprises two adult males, five adult females, and two 

 juvenals. These birds are referable to the eastern subspecies, Plane- 

 sticus rmgratorius migratorius. The outer rectrices are conspicuously 

 tipped with white, which is not the case with the coast form, P. m. 

 caurinus, a diiferentiating character that is readily apparent, even 

 in the live birds. The young from Telegraph Creek are of a differ- 

 ent color from the coast birds, being less brownish and more gray, 

 especially on the upper parts. 



Just how far down the river P. m. migratorius extends we did not 

 definitely ascertain, but, as noted above, robins were abundant as far 

 down the river as Doch-da-on Creek, and abruptly became very scarce 

 just below there. A little below Doch-da-on Creek, and from that 

 point down, forest conditions are such that it seems doubtful that there 

 are many robins breeding anywhere along the lower river. "While we 

 saw and heard a few at Flood Glacier and Great Glacier, we obtained 

 no specimens, so cannot be certain which subspecies occurs at those 

 points. 



Planesticus migratorius caurinus Grinnell. Northwestern Robin 

 Fairly numerous at Sergief Island, though irregularly so, during 

 the whole of our stay at that place, August 17 to September 7. Most 

 of the birds seen were in the midst of the molt. One specimen was pre- 

 served (no. 40327), a young female molting into first winter plumage. 

 Planesticus migratorius caurinus Grinnell (1909&, p. 241) has been 

 refused recognition by the A. 0. TJ. Committee (1909, p. 302), but 

 nevertheless it seems to me a sufficiently distinct subspecies. Addi- 

 tional material acquired since the Committee's action is all corrobora- 

 tive of the describer's diagnosis. (Cf. Swarth, 1912, p. 81 ; Oberholser, 

 1917», p. 195.) 



