4?,() ORNITIIOLOdY. 



sought their food, in company with various insectivorous birds, especially 

 the Black-capped Green Warbler (Mi/iodiodes pusillus) and Swainson's Vireo 

 ( Vircosylvia swainsoni). At such times they uttered frequently their sharp 

 note of chip. The brightly-colored specimens representing H. lutescens were 

 prevalent in the western depression of the Basin, but were not observed 

 eastward of the upper portion of the Valley of the Humboldt, nor at any 

 locality during the summer; and wherever found, were associated with 

 individiuils of the other form, which is the only one found breeding on t]\v 

 mountains. It is therefore inferred that all these individuals were migrants 

 from the northern Pacific Coast region and the Sierra Nevada, while those 

 of H. celata proper were from the higher portions of the more eastern 

 mountains, or from farther northward in the Rocky Mountain ranges; full- 

 fledged young birds being numerous in the high aspen woods of the Wah- 

 satch Mountains in July and August. 



Lint of specimens, 

 a. celata. 



021, <? ad; " Dcariug's Creek," Upper Humboldt Valley, September 11, 1868. 5— 

 7§_(?)_i>J. Upper mandible, browuish i)lumbeous-black, tbe tomium whitish; lower, 

 pale lilaceous plumbeous, darker terminally ; iris, bright sieuna ; tarsi and toes, plum- 

 beous, with yellow cast. 



922, 9 ad.; "Bearing's Ureek," Upper Humboldt Valley, September 11, 18GS. 

 4 1 — 7 J — (!) — l|f. Bill rather more lilaceous. 



1425, Sjiir.; Parley's Park, Wahsateh Mountains, Utah, July 17, 1869. 4}|— 7|. 

 Upper mandible, black ; commissure and lower mandible, dark lilaceous, latter paler 

 basally; iris, brown; tarsi, plumbeous ; toes, olive. 



1505, i ad.; Parley's Park, August 12, 1869. 5 — 7J. Same remarks. 



1516, ^ ad.; Parley's Park, August 16, 1869. 5,\— 55. Upper mandible, black, 

 paler along tomium; lower, lilaceous-blue, whitish basally, blackish terminally; iris, 

 brown ; tarsi, dull plumbeous; toes, more greenish. 



/?. lutescens. 



215, ^ ad.; Camp 19, West Humboldt Mountains, Nevada, September 24, 1867. 

 4| — 7§ — 2| — 2 — '3— 7,\— Ixf— !§• I^'l') blackish horn-color, the lower mandible, paler; 

 iris, brown ; tarsi and toes, deei) horn-color. 



i)07,i ad.; "Secret Valley," East Humboldt Mountains, Nevada, September 8, 

 1868. 41 — 7j\ — (?) — 2. Upper mandil)l»', purplish-black, the tomium deep lilac; lower 

 mandible, bluish-lilac, more pinkish basally, more dusky toward tii) ; iris, vandyke- 

 brown ; tarsi and toes, plumbeous, the latter stained with yellow. 



