Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
Otus asio
Nov. 6-10 Casita, 40 km. S Nogales, 3300 feet, Sonora.
Common in open willow timber on the
valley flat just south of Casita. Two
collected by W. C. Russell.
But one specimen of O. a. ceneraceus,
presumed [illegible],
the race of north-central Sonora, known
(Van Rossem, 1945:107).