Notes on the Nesting of the Lawrence's Warbler r31
earliest dates in southern Arizona and southern New Mexico are included between April 6 and April 9, while the species appears in the northern por- tion of its range in Colorado early in May.
The last do not leave central California until the first week in October and do not desert the state until after the middle of the month,
Notes on the Nesting of the Lawrence‘s Warbler
By ISAAC EILDERSEE
N Nlay 15, 1903, Dr. Wm, Wiegmann observed a Lawrence’s War- 0 bler (Hr/mintbopbila Iawrentii) in Bronx Park. New York City, but did not see the bird again that year. On May 18, 1904, he again observed an individual of this species in the same locality. It was carrying nesting material. On June 6, the bird was obServed Carrying green larvrc, presumably to its young. On June 8, Dr. Wiegmann and I observed the bird at various times during about five hours. lts song, which is described elsewhere in this article, was first heard by us on that day.
On June to, I remained for about seven hours near the place where we had seen this rare Warbler, but I could not find our bird. I had seen a female Blue-winged Warbler fly into a certain thicket of catbrier and sec- ond-growth of dogwood several times during the day, and, in order to conv firm suspicions that I had formed, 1 concealed myself among some near by bushes and waited. At the end of half an hour I was rewarded by seeing the Blue-winged Warhler fly in with food. accompanied by the Lawrence‘s Warbler. The female immediately dropped to the ground, while the Lawrence’s Warbler stayed in the vicinity (at times less than ten feet from me). After five minutes the Blue»winged Warbler flew away, the Lawrence‘s Warbler taking her place on the ground. The Lawrence's Warbler waited until the Blue-winged returned and then flew away with her. It was by this time too dark for further observations. On June 12, in company with Mr. Waldron Dewitt Miller, of the American Museum of Natural History, I paid another visit to the vicinity. In less than five minutes we found the nest. which contained six Hedglings, evi- dently about a week old. The young could not, at that time. be dis- tinguished from the fledglings of either the Golden-winged or Blue»winged Warblers. Mr. Miller and I observed the birds during the remainder of the morning. The parent birds paid frequent visits to the nest. averaging about five minutes between their trips. The female stayed on or near the nest for about eight minutes each time. the male, or Lawrence's Warbler staying only about three minutes.
On June 13, the young were perceptiny advanced. At this time the
