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Sept., 1919 TWENTY-YEAR SERI?S O1 ? ]?GS O1? THE SIERRA JUNCO 1?? conditions. At Bijou, California, I have found nests in early May while the majority of the juncos were sti?11 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- cured. 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 care- 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 eggs 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- versity near Palo Alto, Santa Clara County, Cali- forni'a. Professor J. O. Snyder personally inform- ed me that the identity of these breeding birds, of which several were secured, is positive. Now I wish to shbw that, according to published and other records, we have breeding ihurberi almost entirely surrounded by breeding pi. nosus! For to the north- ward, in rather similar country (not among redwood timber) in Northern San l?Iateo County, J. Roy Pemberton has secured typical pinosus breeding. North- ?vard also, but much nearer, in fact only a few miles from Stanford (and like- wise not in sequoian association) Chase Littlejohn has also found pinosus breeding, in Redwood City. Mr. Littlejohn writes as follows, under date Feb- ruary 23, 1919: "While they are eommo?i enough in the winter I can say I have never found thurberi here during the breeding season, and I have paid partie- Fig. 38. A STUDY OF FIRST AND SECOND SETS OF EGGS FROM THE SAME PAIRS OF JUNCOS; NOTE THE ?VON* DERFUL SIMILARITY IN SIZE, SHAPE, AND STYLE OF THE MARKINGS. UNFORTUNATELY AN EVEN GREATER SIMILARITY IN THE COLORING CANNOT BE SHOWN. UPPER ROW, SETS 63 AND 75; LOWER ROW, SETS 62 AND 73.