546 LAND BIRDS 
known concerning the nesting habits of this species, so 
far as the time of incubation and the rearing of the 
young are concerned. One nest, found near San José, 
June 2, and containing young about six days old, was 
visited daily with no disastrous results, but this is only 
a partial success among a long list of failures. In this 
case the parents were so shy that they refused to go to 
the nest with food while an observer was in sight, and 
the field glasses could reveal nothing sufficiently accurate 
to be recorded. The nest was nicely hidden in a clump 
of weeds on the edge of a small brook and within five 
inches of the ground. A jump across the brook almost 
into it resulted in its discovery. When watched, the 
adults alighted at some distance from it and dodged 
from clump to clump and through the weeds until they 
reached the spot where it lay. Close observation failed 
to record accurately how often they went with food, so 
slyly did they slip through tangles and open like small 
gray mice; the crops of the nestlings, examined immedi- 
ately after feeding, bulged with insect food dark in color. 
They left the nest after four days’ watching, and were 
probably less than ten days old. 
68l1c. PACIFIC YELLOW-THROAT. — Geothlypis 
trichas arizela. 
FamiLy : The Wood Warblers. 
Length : 4.70-5.75. 
Adult Male : Forehead and sides of head black, bordered above with 
white, sometimes tinged with yellow ; rest of upper parts plain olive- 
green ; under parts yellow. In winter washed with brown. 
Adult Female: Upper parts olive-brown, without black, ashy, or white ; 
