430 OUNITIIOLOCY. 



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

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

 {yireosyhia 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 dunng the summer; and wherever found, were associated with 

 individuals of the other form, which is the only one found breeding on the 

 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 tlie 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. 



List of specimens. • 

 a. celata. 



921, <? ad.; " Dcaring's Creek," Upper niimboldt Valley, September 11, 18GS. .">— 

 ''i — (^) — -i- Upper mandible, brownish pbimbeoiisblack, the tomium whitish; lower, 

 l)ale lilaceous plumbeous, darker terininall.y ; iris, bright sienna ; tarsi and toes, plum- 

 beous, with yellow cast. 



0-'2, 9 a(].; " Deariug'a Creek," Upper Humboldt Valley, September 11, 18G3. 

 43 — 7^ — (?) — 1||. Jiill ratiicr more lilaceous. 



142.5, Sjur.; Parley's Park, Wahsatch Mountains, Utah, .July 17, 18C9. 4}|— 7|. 

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

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



15(1'), i ad.; Parley's I'ark, Au},Mist 12, 18(59. 5— 7^. Same remarks. 



151G, S ad.; Parley's Park, August 16, 1869. 5,'j— oj. Upper maudiblo, black, 

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

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



ft. lutescens. 



215, i ad.; Camp 19, West nuinboldt ]yiountains, Nevada, September 24, 1867. 

 4J — 72 — 2j| — 2 — I — 1';— I'ri! — Jr l^'"? blackish horn-color, the lower mandible, paler; 

 iris, brown ; tarsi and toes, deep horn color. 



907, iad.; "Secret Valley," East Humboldt Mountains, Nevada, Sei)tend)er 8, 

 1868. 45 — 7^'^^ — (?) — 2. Upper mandible, purplish-black, the tomium deep lilac; lower 

 mandible, bluish-lilac, more pinkish basally, more dusky toward tip ; iris, vandyko- 

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



