144 



I'liivrrsitji of CalifoDiin ruhlirations in Zoolajj)/ | Vol. 12 



side Mountain. IMareh 17 to '2^. At our station above Blythe. jMareh 

 22 anil 23, this luinunei- was for the firet time numerous, both males 

 and females occurring' alonjr the desert edge of the riparian bottom, 

 feeding among bushes of Lijciitm audcrsoni. At Ehreuberg the last 

 week of March and opposite Cibola the fii"st week in April, the species 

 was abundant in the desert washes, feeding about the profusely blos- 

 soming pali> verdes. Noted at all stations below the latter ]ioint. 

 thiuigii in lesser numbers. 



'Pile males were more seldom seen, .■ind the t'emales lieeame closely 

 restricted to the willow strip along the river, in which association we 

 were convinced that this was the only species of hunnningbird breed- 

 ing. The nuiles were not seen in the willows, but only in the mes(iuite 

 association and up the desert washes. The females foraged everywhere 

 except on the desert mesa, but nested exclusively in the willows. 

 Xest-building was in progress April 12, on the California side twenty 

 miles north of Picaeho. Nests, each with two small young, were found 

 Ai>ril IS and 20. on the same side eight miles east of Picaeho. ^Many 

 full-grown voung-of-the-year were feeding about the lavender flowere 



Fig. G. Vertical sei'timial diagram of iiest (no. 7i>!>) of Archihn-hus ulex- 

 andri. Note position as regards supporting stalk, and construotiou of rim (see 

 text, p. 145). X %. 



