BIKDS OF NORTH AND MIDDLE AMEEIOA. 



457 



32-36 (SS.V); culmen, 12.6-15.5 (M.3); tarsus, 13.5-16 (M.9); middle 

 toe, 10.5-12 (11.2). « 



Mountains of western North America and Mexico, in coniferous 

 forests; north to British Columbia (Vancouver Island and interior); 

 south to States of Vera Cruz (Jalapa, Orizaba, Las Vegas, etc.), Puebla 

 (Mount Orizaba), Mexico (Mount Popocatepetl; Mount Iztaccihuatl), 

 etc., southern Mexico; east to Montana, Wyoming, Colorado, New 

 Mexico, etc., casually to northern Nebraska (one specimen). 



Sitta pygmssa Vigors, Zool. Voy. "Blossom," 1839, 25, pi. 4, fig. 2 (Monterey, 

 California) . — Bonapaetb, Geog. and Comp. List, 1838, 10. — Audubon, Om. 

 Biog., V, 1839, 63, pi. 415; Synopsis, 1839, 168.— Gambel, Proc. Ac. Nat. Sci. 

 Phila., iii, 1846, 112 (Monterey, etc., California; habits; notes). — Sclatek, 

 Proc. Zool. Soc. Lond., 1859, 363 (Jalapa, Vera Cruz); Cat. Am. Birds, 1862, 

 15 (Jalapa); Ibis, 1865, 311 (Jalapa, etc.). — Baibd, Kep. Ives' Expl. Col. R., 

 pt. V, 1861, 6; Review Am. Birds, 1864, 88. — Feilner, Ann. Rep. Smithsonian 

 Inst, for 1864 (1865), 426 (n. California; habits).— Coues, Proc. Ac. Nat. Sci. 

 Phila., xviii, 1866, 78 (Fort Whipple, Arizona) ; Check List, 1873, no. 41; 2d 

 ed., 1882, no. 61; Birds N. W., 1874, 25; Birds Col. Val., 1878, 139.— Brown, 



« Twenty-two specimens. 



Specimens from different localities compare in average measurements as follows: 



Locality. 



Middle 



MALES. 



Ten adult males (of S. p. leuconucha) from San Pedro 



Martir Mountains 



Two adult males from California 



Five adult males from western Nevada and eastern Oregon . 



Four adult males from Colorado 



Seven adult males from Arizona 



Three adult males from northern Sonora 



Two adult males from northern Chihuahua 



One adult male from southern Chihuahua 



Eight adult males from south-central Mexico 



FEMALES. 



Ten adult females (of S. p. leucomKha) from San Pedro 



Martir Mountains 



One adult female from California 



Six adult females from western Nevada and eastern Oregon . 



Three adult females from Colorado 



Two adult females from Arizona 



Six adult females from northern Sonora and Chihuahua . . 



One adult female from southern Chihuahua 



Four adult females from south-central Mexico 



11.5 



12 



11.2 



11.4 



11.6 



11.5 



11.2 



11 



11.5 



11.9 



11.5 



11.4 



11 



11 



11.2 



12 



11.4 



After very careful comparison of the above series, together with many additional 

 specimens, I am not able to discern any obvious difference in coloration according to 

 locality. Possibly the Mexican and California specimens have the pileum more 

 decidedly olive (less gray) than those from the Rooky Mountain district and the 

 under parts more pronouncedly buff in winter plumage; but the California series is 

 much too small to permit of satisfactory comparison. 



