588 



THE AMERICAN NATURALIST [Vol. LI 



and more coarsely mottled. HasbroucM, very limited in 

 known range (see map), is decidedly larger and darker 

 than mccallii, with much less buffy gray above and 

 broader transverse bars. MaxwelUcR, another northern 

 form, is decidedly larger but paler than aikeni. It is the 

 palest of all in color, with more extensive pure white than 

 even neevius. West of maxivellicB, in Washington and 

 Oregon, is macfarlanei, which is larger and very much 

 darker, almost agreeing in coloration with heudirei of 

 California. 



The Pacific coast forms comprise an interesting series 

 running down the coast, beginning with kennicottii, which 

 occurs from Sitka through British Columbia to the south- 

 ern l)order of Washington State. It is very large like 

 )iiacf(irl(ii/ci, but much darker, and browner rather than 

 gray. 'IMie remaining subspecies extending down the 

 coast region and into the desert become progressively 

 paler and smaller. Thus hreiusteri in Oregon is smaller 

 and less brownish than kennicottii. In California occurs 

 heudirei which is lighter again and smaller. GrinnelP^ 

 lias segregated from heudirei in the more arid region of 

 southern California another form under the subspecific 

 name quercinus, considered to be paler dorsally and with 

 less or no ferruginous markings around the head. But I 

 confess that this ditference, if it exists as a constant dis- 

 tinction, is too fine for me to appreciate. On the contrary, 

 specimens of bendirei from Palo Alto appeared to me 

 somewhat lighter on the breast than a seiries from Pasa- 

 dena. Whether or not this very close form is distinguish- 

 able from heudirei, the next in the series are cineraceus, 

 gilnuiui and .raiitusi, becoming progressively lighter with 

 finer \-(M-]iiir-Tila1ioiis, tlie two former in southern Arizona 

 and .rauf/isl (-(.nfiiH'.l t.) tlic tip of the peninsula of Lower 

 California. Muallcr and witli the toes less feathered. 

 ^Thiis the Mil.>iM.ci(.. apprar to he arranged progres- 



and there i> littlo ovcrla) iiiiiig. I'.iit this conception of 



