UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 7, No. 1, pp. 1-8 May 26, 1910 



TWO NEW OWLS FROM ARIZONA 



WITH DESCRIPTION OF THE JUVENAL PLUMAGE OF 

 STBIX OCCIDEXTALIS OCCIDENTALIS (XANTUS) 



BY 



HAEEY S. SWARTH. 

 (Contribution from the Museum of Vertebrate Zoology of the University of California.) 



I first collected typical specimens of these two subspecies 

 some years ago, but at the time refrained from designating them 

 by name, although I appreciated the differences between these 

 forms and their nearest allies. ]\Iy hesitation was due mainly 

 to a lack of sufficient material for comparison, and a consequent 

 uncertainty as to the seasonal changes in plumage. Of the 

 Arizona spotted owl I have been able to obtain but the one 

 specimen, and the fragments of a dead bird found near a canon 

 stream. The examination at different times of a number of 

 California specimens of the spotted owl (at least six besides the 

 ones listed herewith), has failed to reveal a type of plumage 

 approaching this new subspecies. The differences distinguishing 

 the screech owls, though difficult to describe, are clearly apparent 

 upon comparison of specimens, and individuals from the two 

 designated regions appear to be constantl.y different. 



Otus asio gilmani, new subspecies. 



Sahuara Screech Owl. 



Type.— Female adult; no. 10651, Univ. Calif. Mus. Vert. 

 Zool. ; Blackwater, Pinal County, Arizona ; March 29, 1908 ; col- 

 lected bv M. French Oilman; orig. no. 153. 



