348 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Adult Tnale.— Length, (skins), 264-337 (298); wing, 142-156.5 

 (149.4); tail, 121-158 (138.4); exposed culmen, 12.5-14.5 (13.7); 

 tarsus, 19-21.5 (20); middle toe, 18.5-22 (20.2) .« 



Adult female.— Length (skins), 251-310 (281); wing, 132.5-152 

 (143.2); tail, 117-158 (127.3); exposed culmen, 13-15 (13.8); tarsus, 

 18-20.5 (19.2); middle toe, 18.5-20.5 (19.3).^ 



The specimens from the Cape San Lucas district of Lower California seem to represent 

 a distinct form, but unfortunately only three specimens have been examined, and these 

 are in winter plumage. Compared with specimens of Z. m. marginella taken at the 

 same season, these examples from southern Lower California are altogether of browner 

 coloration, and I strongly suspect that they represent an easily distinguishable local 

 form. 



The existence of another very distinct form peculiar to the humid coast district of 

 Oregon and Washington is indicated by three very poor specimens in the series exam- 

 ined. The adult male of this form is characterized by a very saturated coloration, 

 the under parts as deeply colored as in Z. m. macroura and Z. m. clarionensis, and the 

 color of the forehead, anterior portion of crown, and sides of crown and occiput (super- 

 ciliary region) darker than in any other form of the species, being, in a winter specimen, 

 deep fawn color approaching mikado brown. This form, which I separate, provis- 

 ionally, as Zenaidura macroura caurina (provisional type. No. 22540, coll. U. S. Nat. 

 Mus., Oregon; T. R. Peale, collector), most resembles in coloration of the head Z. m. 

 tresmarix, but the under parts are more deeply colored and the chin, instead of being 

 buffy white, in contrast with the adjacent color, is light pinkish cinnamon. 



