156 THE CONDOR Vol. XXII 
leaves was so great that about the time we would have one positively identified it would 
be just too late to shoot. 
Dr. Hanna kindly assisted me in the endeavor to procure specimens for identifica- 
tion and we finally succeeded in securing four. It was a pity that we did not obtain a 
greater number, for those taken all proved to be males, and we do not know whether 
there were any females in this flight, or whether the males were migrating alone, as hap- 
pens with some species. 
Three days later (April 20), we went some distance up the Tres Pinos Creek into 
the Panoche Pass, without going as far as the summit. This also was a cold windy day, 
and but few birds were seen or heard. I did not sea any Calaveras Warblers to be sure 
of, myself, but Dr. Hanna secured another male here. We were very unfortunate in havy- 
ing such weather to contend with, as it hampered our observations extremely. While 
Dr. Hanna was primarily interested in his own line he also kept a keen eye open for 
birds, to which he is also very partial, thereby being of great assistance in my work, and 
for which I take this opportunity of thanking him. 
Several other likely canyons in the county were visited, particularly along small 
streams with more or less wooded banks, but no more of this species were found among 
the numbers of the commoner warblers that were met with. Press of other matters 
compelled us to return to San Francisco without having had the time to go back to The 
Pinnacles for a more thorough study of the situation, but I will hope for an opportunity 
next spring to look farther into the matter, and to ascertain whether or not this species 
migrates regularly along that range of mountains.—JOSEPH MAILLIARD, California Acad- 
emy of Sciences, San Francisco, May 6, 1920. 
Bald Eagle at Wawona.—Upon a visit to Fresno, California, in 1916, I saw in the 
store of Mr. F. G. Normart, a local taxidermist, a mounted specimen of the Bald Eagle, 
presumably the southern subspecies, Haliaeetus leucocephalus leucocephalus. Inquiry 
developed that the bird had been killed at Wawona, Mariposa County, about July, 1914.— 
Tracy I. Storer, Museum of Vertebrate Zoology, Berkeley, California, May 14, 1920. 
Another Rusty Song Sparrow from Southern Californiaa—On December 1, 1919, 
while collecting Fox Sparrows along a little canyon to the north of here, I flushed a 
very dark colored Song Sparrow from the weeds. The bird was collected and sent to Mr. 
H. S. Swarth for his determination. He says: “The dark colored song sparrow seems 
to me to be Melospiza melodia rufina. At any rate I can duplicate it with birds from 
the known habitat of that subspecies.” There appears to be only one other known oc- 
currence for this form for southern California, and that from Riverside (Swarth, Condor, 
x11, 1910, p. 108).—Wricut M. Pierce, Claremont, California, February 23, 1920. 
The Harris Hawk a Breeder in Californiaa—On March 30 of this year (1920) I 
noticed a pair of Harris Hawks (Parabuteo unicinctus harrisi) in the act of mating near 
Brawley in Imperial County. I was not able to find their nest, but the next day about 
eight miles away and three miles west of Calpatria I took a set of three eggs. These 
were very heavily incubated. As far as I am aware, this is the first record of the bird 
nesting in California, but judging from my own observation and that of others there is 
reason to believe that the bird will soon become a regular breeder in the Imperial Valley. 
The nest was built in the crotch of a willow tree about thirty-five feet above the 
ground. It was on the outer fringe of a thick growth from the overflow of the Alamo 
River and easily visible from a near-by farm house. The climb was made for me by 
Ashton Rood, a young boy, and so I am unable to give an accurate description of the 
nest.—GRIFFING BANCROFT, San Diego, California, May 27, 1920. 
Further Notes on Differential Sex Migration.—I received the following letter from 
Mr. John A. Gregg of Burlington, Iowa, in response to my article on “Differential Sex 
Migrations of Mallards in New Mexico’, recently published in the Condor. Mr. Gregg 
is an experienced sportsman and a keen and reliable observer. 
“T was particularly interested in your article for the reason that for a great many ~ 
years I have noticed the same differential applies in this territory. I recall shooting 
