712 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



WILSONIA PUSILLA PILEOLATA (Pallas). 

 PILEOIATED WARBLER. 



Similar to W. p. pus?7I(i, but averaging- larger; coloration brighter, 

 the upper parts more j^ellowish olive-green, the yellow of luider parts 

 brighter. 



Adult maIe.—L.ength (skins), 105-114 (109); wing. 55-60 (57.5); tail, 

 47-52 (50.1); exposed eulmen, 7-9 (8.8); tarsus, 18-20 (18.9).' 



Ad ultf em ale.— "Length (skins), 105-116 (109.2); wing, 51:.5-57 (55.1); 

 tail, 47.5-50 (48.3); exposed eulmen, 7.5-9 (8.5); tarsus, 18-19.5 (18.8).' 



Western North America; l)reeding throughout the Rocky Mountain 

 district, from western Texas (Chisos Mountains), New Mexico ^, and 

 Arizona ^ in higher mountains, northward to Alaska, including coast 

 district (Kadiak,Yakii tat, Sitka, etc.) as well as throughout the interior, 

 westward to eastern Oregon (Fort Klamath; Tillamook) and Queen 

 Charlotte Islands, British Columbia; during migration over the whole 

 of western North America (less commonly along the Pacitic coast of 

 United States ^),and eastward across the Great Plains to Minnesota 

 (Fort Snelling, Ma}'^), western Missouri (Independence), etc. ; in Avinter 

 southward over whole of Mexico and Central America to Chiriqui 

 (Boquete). 



Motacilla pikolata Pallas, Zoogr. Rosso-Asiat., i, 1826, 497 (Kadiak Island, 



Alaska). 

 Myiodioctes pusillnti x&r. pileolata Ripgway, Am. Journ. 8ci., iv, Dei-., 1872, 457, 



part; Am. Nat., vii, 1873, 608, part (diagnosis, etc.) . 

 Myiodioctes pusillus xar. pileolatus Baird, Brewer, and Ridoway, Hist. N. Am. 



Birds, i, 1874, 319, part.— Lawrence, Bull. U. S. Nat. Mns., no. 4, 1876, 16 



(Guichicovi, Chiapas). 

 [Myiodioctes puslUiis] fi.pileolata Ridgway, Orn. 40th Parallel, 1877, 437 (Trnckee 



Valley, Nevada, Aug. 6; lower Huml)oldt Valley, Nevada, Sept. 5; West 



Humboldt Mts., Nevada, Sept. 9). 



^ Twenty-one specimens. 

 ^ Ten specimens. 



Specimens from Kadiak Island compare with others in average measurements as 

 follows: 



Locality. 



MALES. 



Four adult males from Kadiak ( breeding) 58.6 49.7 8.7 19.2 



Nine adult males from rest of Alaska (mostly breeding) 56.6 50 8.2 18.9 



Eight adult males from Arizona (migrants) 58.1 50.4 8.1 18.6 



One adult male from Colorado (breeding) 57 49.5 8.5 19 



FEMALES. 



Five adult females from Kadiak (breeding) 55.5 48.5 8.7 18.6 



Five adult females from rest of Alaska 56.3 48.2 8.3 19 



One adult female from Wj'oming (breeding) 55 47.5 9 18 



Tarsus. 



