20. The nesting
habits of all the sub-species, as far as we can learn, are exactly like
those of the eastern Screech Owl; the eggs cannot be distinguished, and
in most cases, even the birds cannot be distinguished.

373a. FLORIDA SCREECH OWL. _Otus asio floridanus._

Range.--South Atlantic and Gulf coasts.

Slightly smaller and darker than asio. The eggs average slightly
smaller. Size 1.30 x 1.15.

373b. Texas Screech Owl. _Otus asio mccalli._

Range.--Texas, and southward into Mexico. Very similar to floridanus.

373c. CALIFORNIA SCREECH OWL. _Otus asio bendirei._

Range.--Coast of California and Oregon. Size of, but darker than asio.

373d. KENNICOTT'S SCREECH OWL. _Otus asio kennicotti._

Range.--Pacific coast from Oregon to Alaska. This is the darkest of the
Screech Owls and averages a trifle larger than the eastern form.

373e. ROCKY MOUNTAIN SCREECH OWL. _Otus asio maxwelliae._

Range.--Foothills of the Rockies, from Colorado to Montana. This is the
palest form of the Screech Owl. Of the same size as the last.

[Illustration 235: White.]
[Illustration: Screech Owl.]
[Illustration: right hand margin.]

Page 234

373f. Mexican Screech Owl. _Otus asio cineraceus._

Range.--Western Mexico and southwestern border of the United States. A
gray form with little or no buff, and more numerously barred below.

373g. AIKEN'S SCREECH Owl. _Otus asio aikeni._

Range.--El Paso County, Colorado. A gray form, with the dark markings
coarser and more numerous than in any other.

373h. MACFARLANE'S SCREECH OWL. _Otus asio macfarlanei._

Range.--Northern border of the United States from Washington to Montana.

373.1. Spotted Screech Owl. _Otus trichopsis._

Range.--Mountains of southern Arizona, south into Mexico.

A grayish species, similar to asio, but paler and more finely barred
beneath, and with whitish spots on the feathers of the foreback. The
nesting habits and eggs are probably the same as those of the Screech
Owl.

373.2. XANTUS'S SCREECH OWL. _Otus xantusi._

Range.--Southern Lower California.

A grayish species with the back and underparts finely vermiculated with
reddish brown, and with streaks of darker. It is not likely that the
habits or eggs of this species will be found to differ from those of the
Screech Owl.

374. FLAMMULATED SCREECH OWL. _Otus flammeolus flammeolus._

Range.--Mountain ranges of Mexico, north to Colorado and west to
California.

This species is sm