1909] The 1907 Alexander Alaska Expedition. 189 
Larus glaucescens Naumann. Glaucous-winged Gull. 
This was a widely-distributed and generally common sea bird 
throughout the region. At Windfall and Mole harbors, Admir- 
alty Island, the species was seen in numbers almost daily from 
April 17 to June 10. At the former poimt an immature male 
(No. 8) was taken May 8, and an adult male (No. 9) May 9. A 
few glaucous-winged gulls were seen on the outer beach at Red 
Bluff Bay, Baranof Island, June 11 to 20. At Port Frederick, 
Hooniah, and Idaho Inlet, Chichagof Island, the species was 
more or less common at various times between June 20 and 
August 1. Individuals were often seen on the mud. flats at the 
mouths of the streams. Stephens found it, but not commonly, 
at Helm Bay, September 10 to 17. 
Only at Glacier Bay was the glaucous-winged gull found 
breeding. A good many were found nesting on the smaller tree- 
less islands about the bay. On June 28 the first eggs were seen. 
There were eight or nine nests containing one fresh egg each. 
These may not have been the first deposited; for at this place 
the natives rob the nests regularly. On South Marble Island, 
July 5, Dixon found a colony nesting. There were as yet no 
young. Sets of two eggs each were about as numerous as sets 
of three. Incubation at that date was well advanced. On July 
14, young only a few hours out of the shell were found by Steph- 
ens, and two were prepared as skins (Nos. 25, 26). On the 16th 
many young were seen about a small lake, though on the same 
day slightly incubated eggs were taken. The nests consisted of 
moss and grass, lining a slight excavation scratched in the turf 
usually beneath a bush of some sort. 
A series of twenty-nine eggs of the glaucous-winged gull was 
secured. Among these is a runt measuring only 43 31.5 mm. 
Its coloration is no different from that of the rest, though the 
shell is thicker and rougher-surfaced. It was one of a set of 
three taken, the others being normal, and it was infertile. In 
this series the ground color varies from olive-buff to a rather 
pale broccoli brown. The markings are in the nature of spots 
and blotches of varying sizes up to a diameter of 7 mm., quite 
evenly distributed over the entire surface, and of colors grad- 
