360 Vnwersity of California Publications in Zoology \yoh. 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 waxwings were seen daily about Hazelton. 



Seven specimens collected, five adults and two juveniles (nos. 

 42443^2449). An old bird shot August 22 is just beginning the 

 annual molt; another collected September 5 has finished it. One 

 young bird stiU 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, ( linnaeus ) . 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 miles 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 



