54 



NORTH AMERICAN FAUNA. 



(NO. ly. 



SPECIES AND SUBSPECIES OCCURRING IN THE YUKON UASIN AND HAVING THEIR CENTER 

 OF ABUNDANCE DURING THE BREEDING SEASON IN ALASKA AND BERING SEA. 



Rissa tridactyla poUicaris.' 



Larus barrovianus.' 



Lams vegpc'.* 



Larus brachyrhynchus. 



Sterna aleutica.' 



Phalacrocorax pelagicus rol)ustus.' 



Arctonetta fischeri.^ 



Somateria v-nigra.' 



Chen hyperborea.^ 



Branta canadensis minima. 



Branta nigricans.^ 



Philacte canagica.' 



Grus canadensis.^ 



Macrorhampus scolopaceus. 



Tringa couesi.^ 



Ereunetes occidentalis. 



Heteractitis incanus. 



Canachites canadensis osgoodi. 

 Haliteetus leucocephalus alascanus. 

 ? Megascops asio kennicotti. 

 Picoides americanus alascensis. 

 Sayornis saya yukonensis. 

 Contopus richardsoni saturatus. 

 Perisoreus canadensis fumifrons. 

 Pinicola enucleator alascensis. 

 Leucosticte tephrocotis littoralis. 

 Calcarius lapponicus alascensis. 

 Hirundo erythrogastra unalaschkensis. 

 Dendroica testiva rubiginosa. 

 Dendroica coronata hooveri. 

 Parus cinctus alascensis. 

 Parus hudsonicns evura. 

 Hylocichla ustulata almae. 

 Hesperocichla ntevia. 



Arenaria melanocephala. 



Of these 35 forms, 1 is a subspecies of can Asiatic bird, 5 are chiefly 

 confined to Bering Sea, 2 range in winter to the western Pacific, 7 

 are resident subspecies of northern North American birds, and the 

 remaining 20 pass in winter to the western United States or beyond. 



EASTERN NORTH AMERICAN SPECIES FOUND IN THE YUKON BASIN. 



Limosa hjemastica. 

 Numenius borealis. 

 Accipiter atricapillus. 

 Falco span^erius. 

 Colaptes auratus luteus. 

 Chordeiles virgiuianus. 

 Empidonax trailli alnorum. 

 Junco hyemalis. 

 Passerella iliaca. 



Helminthophila celata. 

 Helminthophila peregrina. 

 Dendroica striata. 

 Seiurus aurocapillus. 

 Wilsonia pusilla. 

 Hylocichla alicipe. 

 Hylocichla aonalaschkpe pallasi. 

 Merula migratoria. 



WESTERN NORTH AMERICAN SPECIES FOUND IN THE YUKON BASIN. 



Anser albifrons gambeli. 



Branta canadensis hutchinsi. 



Olor buccinator. 



Symphemia semipalmata inornata. 



Bonasa umbellus umbelloides. 



Pedioecetes phasianellus columbianus. 



Buteo borealis calurus. 



Buteo swainsoni. 



Falco columbarius richardsoni. 



Bubo virginianus pallescens. 



? Dryobates villosus hyloscopus. 



Picoides americanus alascensis. 



Selasphorus rufus. 



Empidonax trailli. 



Empidonax hammondi. 



Otocoris alpestris leucoljema. 



Pica pica hudsonica. 



Calcarius pictus. 



Ammodramus sandwichensis alaudinus. 



Zonotrichia leucophrys gambeli. 



Spizella monticola ochracea. 



Spizella socialis arizonse. 



Seiurus noveboracensis notabilis. 



Cinclus mexicanus. 



Parus atricapillus septentrionalis. 



Myadestes townsendi. 



Sialia arctica. 



' Reported only from the Yukon Delta. 

 * Known only as migrant*. 



