360 University of California Publications in Zoology [Vo 24

of difference lies in the coloration of the throat. In the males the
black is darker, more extended and sharply separated from the rest
of the underparts. In the females the throat patch is smaller, duller,
and not so sharply delimited, fading more gradually into the gray of
the underparts. The present writer has tested this character on two
occasions, series of Bohemian waxwings being laid out with the labels
hidden from view, and the sexes then separated by the above criterion.
In each case the division was made without a mistake.
(For use of the name pallidiceps see Reichenow, 1908, p. 191.)

Bombycilla cedrorum Vieillot. Cedar Waxwing

On June 17 a small flock was seen near Hazelton. Others were
noted in Kispiox Valley a few days later; by the last week in June
these flocks were breaking up into pairs. When we returned, the
middle of August, nesting was finished and young and old were
gathered in flocks once more. During the last two weeks in September
cedar waxwines were seen daily about Hazelton.

Seven specimens collected, five adults and two juveniles (nos.
42443-49449). An old bird shot August 22 is just beginning the
annual molt; another collected September 5 has finished it. One
young bird still in juvenal plumage throughout was collected Sep-
tember 5. One of the two juveniles has small but distinct red tips
to four secondaries on each wing, whereas in four of the five adults
these markings are utterly lacking.

Vireosylva olivacea (Iuinnaeus). Red-eyed Vireo

Fairly common in poplar woods near Hazelton. On the evening
of June 7 the first arrival,was heard singing; the next day a number
were encountered. Hazelton is apparently the northern extreme
reached by the red-eyed vireo, none being seen in Kispiox Valley, a
few mules farther north. Five specimens collected, four adult males
and one adult female (nos. 42450-42454).

Vireosylva gilva swainsoni (Baird). Western Warbling Vireo

Fairly common in the lowlands. Present when we reached Hazel-
ton (May 26), and beginning breeding activities. On June 3 a warb-
ling vireo was seen at work at a nest. The species remained in fair
abundance through August, leaving rather abruptly at the end of that