The Plain Titmice 
into dull grayish white or pale brownish gray, the brownish element strengthening 
posteriorly. Bill grayish horn-color with paler tomia; feet and tarsi bluish gray. 
Young birds are buffier, especially posteriorly. Males average: length (skins) 127 
(5.00); wing 68.7 (2.70); tail 57 (2.24); bill 11.3 (.44); tarsus 21.1 (.83). 
Recognition Marks. —Warbler size; “plain” gray coloration distinctive. 
Nesting.— Nest: A deep cushion of rabbit-fur or other soft substances, placed 
in natural or “worked” cavity in tree or in adobe cliff; also variously in artificial nesting- 
boxes. Eggs: 5 to 7; plain white or spotted sparingly or variously, sometimes 
wreathed with yellowish brown. Av. size 18.5 x 12.95 (.73 x .51). Season: March— 
June; two broods. 
Range of Beeolophus inornatus. — Resident chiefly in the Upper Sonoran zone 
of the United States from the northern border of Lower California and Mexico north 
to Colorado, Utah, Nevada, and northern California. 
Range of B. i. inortiatus (Wholly within California).— Common resident, 
chiefly in the oak association of the Upper Sonoran zone west of the Sierra divide and 
north of the Tehachipe, north to Mendocino and Siskiyou counties. 
Authorities.—Gambel ( Parus inornatus), Proc. Acad. Nat. Sci. Phila., vol. ii., 
1845, p. 265 (orig. desc.; Monterey); Adams, Osprey, vol. ii., 1898, p. 81 (habits, 
eggs, etc.); Beal, U. S. Dept. Agric., Biol. Surv. Bull., no. 30, 1907, p. 68, pi. v., part 
(food). 
No. 121a San Diego Titmouse 
A. O. U. No. 733, part. Baeolophus inornatus murinus Ridgway. 
Description. —Similar to B. i. inornatus, but said to be slightly larger; tone of 
upperparts a trifle lighter; the gray of underparts slightly darker. An intergrade 
between inornatus and griseus whose recognition in nomenclature is of doubtful wisdom. 
Range of B. i. murinus (Almost wholly within California).— Resident in the 
San Diego district, from the northern border of Lower California north to Ventura and 
Santa Barbara counties, east to the desert divide. 
Authorities.- — Baird ( LopJiophanes inornatus), Rep. Pac. R. R. Surv., vol. ix., 
1858, p. 386, part (Ft. Tejon); Willett, Pac. Coast Avifauna, no. 7, 1912, p. 104 (s. 
Calif.; occurrence, nesting dates). 
No. 121b Gray Titmouse 
A. O. U. No. 733a. Baeolophus inornatus griseus (Ridgway). 
Description. —Similar to B. i. inornatus, but decidedly grayer, less olivaceous 
above, nearer light grayish olive and smoke-gray; slightly longer. 
Range of B. i. griseus.- —That of the species, save for California, west of the 
Sierran and desert divides. 
Range in California. —Sparingly resident in the Upper Sonoran zone of the 
desert ranges, east of the Sierras. Northern limit “the eastern slope of the Sierra 
Nevada ... at the head of Owens River” and Benton, Mono County (A. K.Fisher). 
Authorities. — Fisher ( Parus inornatus griseus), N. Am. Fauna, no. 7, 1893, 
p. 138 (Panamint Mts., etc.); Stephens, Condor, vol. v., 1903, p. 105 (Providence Mts.); 
Cones, Birds Col. Val., 1878, p. 114, part (Ariz.; syn., desc., etc.). 
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