ORNITHOLOGIST 



[Vol. 15-No. 1 



Harporhynclius rufus, var. 



longirostris, Tex. 2 .86 



Troglodytes a-don, R. I. C .59 



111. 7 ..59 



Iowa 7 ..59 

 •' •' var.park- 



mani. Cal. 12 .01 



Parus atricapillus, R. I. 21 .50 



111. .59 



" " occi<lentalis, Or. 7 ..55 



Polioptila ea-rulea, X. J. 4 



Mi.ss. 4 ..52 



Tex. 5 ..53 

 " var. jiluinhea. Arizona 



Hylocirhla ustulata. Or. 4 .78 



Cal. 4 .78 



44 44 y.,,. 



swainsoni, (iraiul .Man;ni 7 .79 



Merula migratoria, Mass. 37 1.01 



" •• Minn. 4 .90 



44 44 y..,,. 



propiiKpni, ( al. 2 1.03 



l.(t:! i.o:; 



Amon^ Jill families lower than lidptoren I 

 have been able to obtain but meagre material 

 for oompaiison, the only exainjjle amoiio- the 

 divers being that of the Thick-billed Grebe 

 (Poilih/iiibHx podicepfi), in whicli the Californian 

 sj^ecimens are larger than eggs from east of 

 the Kocky mountains. 



In the Gidiuud'uKM the size increases from 

 south (Floi'ida) to the north (Wisconsin), while 

 with the Herons, the Texas specimens are 

 smaller than New Kiigland examples, and these 

 eggs are in turn inferior in size to those from 

 the northern central states. Eggs of the grouse 

 family show a like variation between eastern 

 and western specimens, those of the Ruffed 

 (irouse Bo)i(i.s(i iohUcUks of Southern Xew Eng- 

 land being mucji smaller than those of rar. 

 sdhinel of the Pacific coast. 



Among the linjiforcN individual variation is 

 so marked that in m()st instances a large series 

 from each locality is desirable in order to ob- 

 tain satisfactory results in comparison. 



The eggs of tlie Turkey Jinzzard, ('atliartex 

 (iiira), specimens showing a marked increase in 

 size from North Carolina mutliMaid to Penn- 

 sylvania; the Hed-tailed Hawk {Iii(teo boreall.s), 

 which increase in size from Texas and Miss- 

 issippi to the New England states; and the 

 eggs of rar. cKhtnis fi-om <'alifornia seem to be 

 smaller than souu- from east of the IJocky 

 Mountains, viz.: Minnesota specimens, but 

 possibly a larger sciies, (four being all that I 

 have examined), would give other tigures. 



My third exa-uipl/, showing a geographical 

 variation among tiie diurmd liii])t<>rei<, is that 

 of t'.ie (!.) )pi;r"s H vwk {Acripilfi- cooperi), vvliicli , 

 east of the (Central IMateau, vary in unison 

 with the last example, but the two sj)ccimcns 



