Sept., 1919 TWENTY-YEAR SERIES OF EGGS OF THE SIERRA JUNCO 157 
conditions. At Bijou, California, I have found nests in early May while the 
majority of the juncos were still in flocks. At Forni Meadow, 7,500 feet ele- 
vation, we noted a pair engaged in nest building on July 2, 1916. 
It is not often that an opportunity is offered to secure the first and second 
sets of eggs from any one pair of juncos. This difficulty is due to the variable 
character of the birds’ nesting sites, to the heavy percentage of nests destroyed, 
and to the time that must necessarily elapse before a second set can be laid. 
During the present year (1919), however, we were fortunate in securing first 
and second sets from two pairs of juncos which, nesting in rather secluded 
situations, rendered the locating of their second nests less difficult. Set 63 was 
taken June 12; and on June 21, 300 feet distant, the second set, no. 75, was se- 
eured. Set 62 was collected on the 11th of June, and no. 73, a second set, nine 
days later and but 60 feet away from the site of this pair’s first nest. 
Construction of all four 
nests was practically the 
same. The second nests 
were in no way more ¢are- 
fully concealed, as has 
sometimes been the case in 
my experience with those 
of other species. 
Much of interest could, 
of course, be written re- 
garding the junco from 
notes afield, but, as previ- 
ously explained, the inten- 
tion here is to bring the 
ego's to the front and leave 
all else subordinated. Be- 
fore closing, however, I 
wish to speak of a very un- 
usual situation. This is the 
occurrence and nesting of 
this bird at Stanford Uni- 
Fig. 38. A STUDY OF FIRST AND SECOND SETS OF EGGS ‘ 
FROM THE SAME PAIRS OF JUNCOS; NOTE THE won- Versity near P alo Alto, 
DERFUL SIMILARITY IN SIZE, SHAPE, AND STYLE oF Santa Clara County, Cali- 
THE MARKINGS. UNFORTUNATELY AN EVEN GREATER fornja. Professor J. O. 
SIMILARITY IN THE COLORING CANNOT BE SHOWN. 
UPPER ROW, SETS 63 AND 75; LOWER ROW, SETS 62 Snyder personally inform- 
AND 73. ed me that the identity of 
these breeding birds, of which several were secured, is positive. Now I wish 
to show that, according to published and other records, we have breeding 
thurbert almost entirely surrounded by breeding pinosus! For to the north- 
ward, in rather similar country (not among redwood timber) in Northern San 
Mateo County, J. Roy Pemberton has secured typical pinosus breeding. North- 
ward also, but much nearer, in fact only a few miles from Stanford (and like- 
wise not in sequoian association) Chase Littlejohn has also found pinosis 
breeding, in Redwood City. Mr. Littlejohn writes as follows, under date Feb- 
ruary 23, 1919: ‘‘ While they are common enough in the winter I can say I have 
never found thurberi here during the breeding season, and I| have paid partic- 
