362 BULLETIN 191, UNITED STATES NATIONAL MUSEUM 



small young. In this case the nest was a felted mass of deer hair and woodrat 

 fur, intermingled with a few feathers. It was in a knot-hole of a dead fir sapling, 

 two and one-half feet from the ground. In 1906, at Dry lake, June 15, a set of 

 five slightly incubated eggs of this species was taken from an old sapsucker hole 

 twenty feet above the ground in a dead tamarack pine. The nest was a large mass 

 of reddish deer hair. 



There is a set of seven eggs in my collection, taken by Wright M. 

 Pierce near Bear Lake in these mountains on May 19, 1923, from a 

 cavity on the under side of a large, dead, fallen yellow pine. 



Eggs. — The eggs of Bailey's chickadee are evidently similar to those 

 of the type race, the mountain chickadee, as described under that form, 

 sometimes pure white, but oftener more or less lightly spotted with fine 

 dots of light browns. I have no record of such large sets as mentioned 

 under the mountain chickadee, but they may occur. The measurements 

 of 40 eggs average 16.2 by 12.7 millimeters; the eggs showing the four 

 extreme measure 17.7 by 13.5, and 14.6 by 11.6 millimeters. 



Voice. — Ralph Hofifmann (1927) gives a slightly different account of 

 the voice of this chickadee from that quoted under the mountain chick- 

 adee. He writes : 



A visitor from the E^st misses the familiar Black-capped Chickadee from the 

 rich bird life in the lowlands of southern California. Let him, however, climb a 

 few thousand feet up any of the mountain ranges, among the yellow pines, and 

 there will be, if not his eastern friend, at any rate a close relative. The Mountain 

 Chickadee is so close to the eastern bird, so like in voice, habits and appearance, 

 that it will take a few moments to discover the difference. The bird clings head 

 downward to an outer twig, hammers a seed open on a limb, lisps tsee-dee-dee to 

 its fellows and is apparently the same active, cheery mite. The sweet whistled 

 call is more often made up of three (sometimes four) notes tlian that of the 

 Eastern bird. Sometimes the three notes come down the scale to the tune of 

 'Three Blind Mice.' At other times the last two are the same patch tce-dec-dee. 

 Occasionally the bird either leaves off the third note or adds a fourth. As the 

 chickadee gleans from twigs, it utters a hoarse tsick tsick dec dee or a husky 

 tsee dee, and other little gurgling or lisping calls, and a sharp tsik-a when startled 

 or excited. 



PAKUS GAMBELI ATBATUS (Griniiell and Swarth) 

 SAN PEDRO CHICKADEE 



In naming and describing this Lower California subspecies, Grinnell 

 and Swarth (1926) remark: 



The race of Mountain Chickadee of the Sierra San Pedro Martir, as compared 

 with related subspecies, exhibits an appreciable darkening of the plumage in the 

 direction not of brown but of slate. This darkening is most apparent on the 

 flight feathers, which are slaty black as compared with the more brownish-hued 

 quill feathers of other races ; but it shows also in more leaden-hued flanks and 

 upper parts. This general leaden tone of coloration is quite apparent in fresh 



