190 University of California Publications in Zoology. (Vou. 5 
ing from deep vandyke brown and bistre to pale drab-gray, 
blending with the ground color. The markings have a generally 
longitudinal trend, in some cases spiral. Relatively to the 
amount of variation exhibited in series of other gull’s eggs, the 
present series exhibits remarkable uniformity. Two eggs se- 
lected as extremes in size (except the runt), measure: 76 & 52.5 
and 66.8 * 48. ; 
Larus argentatus Briinnich. Herring Gull. 
According to Dixon’s notes, gulls believed to be of this species 
were seen during the latter half of April at Windfall Harbor, 
Admiralty Island. These were doubtless in migration. <A soli- 
tary, silent individual was repeatedly seen about the chain of 
lakes back of Mole Harbor, Admiralty Island, as late as June 11. 
Larus brachyrhynchus Richardson. Short-billed Gull. 
This gull was met with nearly everywhere the party went. 
At Windfall Harbor, April 25, a great many were seen passing 
northward and this flight continued at intervals for several days. 
At Mole Harbor the species was rather common, May 19 to June 
10; and one lone individual was seen about the lakes a few miles 
inland. At Red Bluff Bay in June, and at Bear Bay and Rod- 
man Bay in August a goodly number were seen. A few were 
noted at Hooniah and Idaho Inlet in June and July. A large 
flock of short-billed gulls stayed around the mouth of a salmon 
ereek at Hawk Inlet, August 1 to 9. The species was common 
on Glacier Bay June 27 to July 20; and a few were noted at 
Helm Bay, September 10 to 17. In spite of their constant pres- 
ence throughout the season, however, no inkling was obtained as 
to their nesting places. 
Three adults (Nos. 39, 40, 61) from Windfall Harbor, Ad- 
miralty Island, April 24 and 25, and one full-grown juvenal 
(No. 71) from Peril Strait, Baranof Island, August 23, were 
secured. Two of the adults show flecks of dusky about the head. 
These were evidently just completing a pre-nuptial molt, the 
dusky flecks belonging to the last remaining feathers of the 
winter plumage. 
