MEASUREMENTS. 



Doubtless a very large series of skins would show a grad- 

 ual-increase in size from south-northward in all measurements 

 except perhaps the bill and feet. In a small series this can be 

 emphasized only when the mean is obtained from remote local- 

 ities. The table showing the sexual, individual and geograph- 

 ical variation requires no further comment than that the meas- 

 urements are in inches and hundredths, and were taken by the 

 wTiter from the dry skins of adult birds, secured on their 

 breeding grounds. Late fall, winter and early spring speci- 

 mens are not included. The measurements of young birds but 

 a short time out of their nests follows. It would be well to 

 state here that the first primary which is spurious or rudimen- 

 tary, measures but a little over two inches in the juvenile, and 

 less than two, usually about one and a half inches in the 

 adult. 



Bill 



Nostril Depth Width 

 wing Tail Tarsus to Tip at Nostril 



xr^ tT,«,-„ r 1" fAver. 6.04 4.15 1.07 1.09 ..33 .35 



TT •? Vc/^ 1 \ Max. 6.30 4.46 1.14 1.14 .36 .40 



United States males | ^^.^^ ^ g^ ^ ^^ ^ ^^ ^ ^^ 2^ 32 



ind 43° par 13 f-^^'^^' ^^ ^'^^ ^'^^ 1 11 '^^ -^^ 



11 1 1 FT f 1 i Max. 6.27 4.55 1.10 1.23 .35 .37 



aiieisiat.) L lemaies j^ ^j^^^ ^_r;^ 3_gQ -^_qq j^^g .28 .31 



Southern C 9 

 UnitedStates males 



fAver. 6.00 4.07 1.07 1.07 .32 .35 

 \ Max. 6.25 4.62 1.10 1.15 .39 .39 



(Between 33°' ^ ^"^- ^-^'^ ^'^^ ^ ^^ ^^^ '^^ ^^ 



^fo^o] TA (Aver. 6 00 4.01 1.09 106 ..34 .35 



nii?T f 1 -^ Max. 6.23 4.62 1.12 1.13 .41 .39 



allellat.) I females ] j^.^_ ^^^ 3 gg ^^. gg 29 .32 



fAver. 5.75 3 66 .95 1.07 .31 .34 



9 Juveniles ^ Max. 6.00 4.05 1.08 l.Il .40 .36 



(Min. 5.55 3.10 .80 1.01 .22 .31 



