lUKDS OF NUKTil AND MIDDLE AMKKJCA. 



18 



YmiiKi hi scr(//i(/ s>n/t//ir/'." ~Vm)cr ])arts o-riiyish. as in summer 

 adults, hut suporciiiaiT sti'ipe and uudor ])arts paler (dull ])al(' hutly 

 or dull hutly white) than in w intei' adults, the chest, sides, and Hanks 

 eonspicuously streaked with dusky: hill and feet Idackisli. as in 

 summer adults. 



Yoitiuj hi p'rsf iiii/iiniii (did irinter. — Similar to winter adults. I>ut 

 up})er parts deeich'dly hrown and superciliaiy sti'ipe and undei' ])arts 

 rather deeper hrowuish huti'. with streaks on chest, etc., less sharply 

 defined. 



YoKiKj^ ^fi rst pi uiiimjf. — Similar to winter adults, hut sca})ulais and 

 intersca])ulars much darker centrally, the dorsal re^-ion heing distinctly 

 spottcnl \vith dusky. })ale superciliary stri})e indistinct or ohsolete; 

 streaks on chest and sides of h)\ver thi'oat hlacker. usujilly heavier, 

 those on sides and tiaid<s indistinct or ohsoh'te. 



Adult m«7^.— Length (skins), \\i)-im (U!».()): wing, T8-9i4 (85.1); 

 tail. 57.5-70 (04.7); exposed cuhuen, 11-18 (12.5); tarsus. 20.5-28 

 (21.7); middle toe, 18-15 (14.4); hind claw, 7-11 (8.9)-'' 



Adult female.— \^^\\gt\x (skins), 135-155 (146.7); Aving, 78-87 (81.9); 

 tail, OO-er) (62.2); exposed culmen. 11-13 (12.1); tarsus. 21-22.5 (21.7): 

 middle toe, 13.5-15 (14.4); hind claw, 7-11 (9.4).'' 



« The species breeds in this plumage, whicli is very different from the fullj"^ adult 

 summer dross. • • 



''Thirty specimens. 



'Twenty specimens. 



Specimens from separate geoiitaphic areas (nearly all l)reediiijj; birds) averajie, 

 respectively, as follows: 



Local it\. 



MAI.KS. 



Ten ailull malts from iiurtlu'asU'rn North Aiiu'rica. 



Ton afiiill inaU's (brcudiiiK birds) from Colorado ... 



Ton adult males from I'aoitio coast (nearly all 



breeding i 



I'KMAI.KS. 



Seven adiill females from northeastern North 



.Vmerica 



Si.vadidl females uillbreoding birds) from Colorado 



Seven ailnlt females (mostly l)roodinK) from I'acifie 



coast 



Middle 

 toe. 



14.1 

 14.7 



14. s 

 14 



14.3 



Hind 

 claw. 



S.5 

 9.7 



Xearly all the s|pcciini'iis I'mni ( '(ihnadd, ('s|ifcially the I'ciiiales, were taken after 

 till' iniddK' ol' .Inly, and liavi'thr itriniarics and icctrici's nincli wmii at I'lids; cuiisc- 

 quently C'oiorado f^pi'ciincns in nnwurn iiliimauc wuidd show trrcater averajje len«rth 

 of win>: and tail. 



I am unable to makcont any constant liiflVrencc in coloration accordiiit; to localitv. 

 Possibly western sin-ciniens ( incliidiii}); both tiie Ixocky ^b)tinlain and Alaskan series) 

 aveia-c a little jia-ler, with the chest mon^ often unstreake(l, or but sliirhtly streaked, 

 than casicrn. Imt the individnal vaiiatiou'is su <rreat in examples from an\ locality 

 Dial I ilonlil the po.ssiliilily of siilalividiiiLi- the spe<-ies satisfa<'torily. 



