CONTOPUS BOREALIS. 535 



sents ill this interiiKHliate rog'ion. Tt was ev(;n noticed at several staj^e- 

 statioiis ill the midst of the Iluiuljoldt and Carson Deserts, where no water 

 occurred except in the artificial Avells. About the larger settlements it was 

 found to be more numerous, and at Unionville, in the West Humboldt 

 Mountains, had, witli Sialia ardica and Salpinctes ohsoletus, taken possession 

 of the abandoned adobe houses in the upper portion of the town. At this 

 place we observed a nest which was attached to the under side of the eave 

 of a large stone building, being apparently built upon the base of a deserted 

 nest of the Cliif Swallow (Petrochclidon lunifro)is). 



While this species agrees with its more western and eastern represent- 

 atives {S. nigricans and S. fusctis) in nesting-habits, the character of its 

 nest and eggs, its fondness for rocky localities in the vicinity of Avater, and 

 in the readiness with which it becomes attached to the vicinity of dwellings, 

 it difi'ers from both in notes, the usual utterance being a fine plaintive peer, 

 peer, much like a certain wailing note of Contopus virens, another common 

 iK)te being a prolonged querulous twitter. 



List of specimens. 



181, 9 ad.; West Humboldt Mountains (Camp 18), Nevada, September 11, 1SG7. 

 8Jg — 12J— tj— S^'g— § — ^—H—H- Bill, tarsi, and toes, deep black ; iris, hazel. 



450, <? ad.; Carson City, Nevada, March 25, 1868. 7^— 12g— 4/g— 3^. Bill, deep 

 black; iris, bister; tarsi and toes, plumbeous-bhu^k. 



457, 9 ad.; Carson City, Nevada, March 25, 1SG8. 7}|— 12g— 4x'6— 3f\. Same 

 remarks. 



702, nest and eggs (2); island in Pyramid Lake, Nevada, May 23, 1SC8. Nest 

 attached to shelf on roof of cave, on rocky shore. 



704, nest and eggs (4); east shore of Pyramid Lake, May 25, 1808. Nest on shelf 

 iu cave, among the tufa domes. 



Contopus borealis. 



Olivc-sidcd Fiycatclicr. 



Tyrannus borealis, SWAINSOU, Fauna Bor. Am., II, 1831, 141, pi. xxxv. 



Contopus borealis, Baird, B. X. Am., 1858, 188; Cat. N. Am. B., 1859, No. 137.— 

 Cooper, Orn. Cal., I, 1870, 323. — CouES, Key, 1872, 173 ; Check List, 1873, 

 No. 253 ; B. N.W., 1874, 243.— B. B. & II., Dist. N. Am. B., II, 1874, 353, pi. 

 XLIV, flg. 1.— IlENSUAW, 1875, 350. 



This interesting bird was a rather common summer-resident in tho 



