448 BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



Sitta caroUnensis . . . var. aculeata CouES, Check List, 1873, no. 38ct, part. — 

 Yaeeow and Henshaw, Orn. Kep. "Wheeler's Surv., 1874, 8 (Wasatch Mts., 

 Utah).— Henshaw, Eep. Orn. Spec. Wheeler's Surv., 1874, 40 (Utah), 73 

 (Fort Garland, Colorado, breeding), 100 (Arizona; New Mexico), 155 (Ari- 

 zona) ; Zool. Bxpl. W. 100th Merid., 1875, 173 (Colorado; Arizona). 



\_SUta caroUnensis.'] Var. aculeata Coues, Key N. Am. Birds, 1872, 83, part. 



Siita caroUnenm aculeata Coues, Birds Col. Val., 1878, 134, part; Check List, 2d 

 ed., 1882, no. 58, part.— Eidgway, Nom. N. Am. Birds, 1881, no# 51a, 

 part.— Ageesborg, Auk, ii, 1885, 277 (s. e. South Dakota; "resident").— 

 Sbton, Auk, iii, 1886, 327 (Big Plain, Portage la Prairie, and along Red R., 

 w. Manitoba; summer resid.). — American Ornithologists' Union, Check 

 List, 1886, no. 727a, part.— Cooke, Bird Migr. Miss. Val., 1888, 276 (w. 

 Manitoba; e. Nebraska; Vermilion, s. e. South Dakota; Fort Davis, w. 

 Texas); Bull. 37, Col. Agric. Coll., 1897, 122 (Colorado, resident, breeding 

 from 7,500 ft. to timber line).— Scott (W. E. D.), Auk, v, 1888, 165 (s. Ari- 

 zona, in mountains). — Thompson, Proc. U. S. Nat. Mus., xiii, 1890, 630 (Mani- 

 toba, in oak woods; summer resid.; habits). — (?) Fannin, Check List Birds 

 Brit._,Col., 1891, 43 (e. side Cascade Range) .—Allen, Bull. Am. Mus. N. H., 

 V, 1893, 41 (El Pinito, Napolera, etc., n. Sonora). — Jouy, Proc. U. S. Nat. 

 Mus., xvi, 1893, 776 (32 m. s. of Nogales, Sonora, June 19). — Meeeill, Auk, 

 XV, 1898, 20 (Fort Sherman, Idaho, breeding).— (?) Chapman, Bull. Am. 

 Mus. N. H., iii, 1900, 153 (interior British Columbia). 



Sitta caroUnensis . . . fi. aculeata Ridgway, Orn. 40th Parallel, 1877, 415, part 

 (Wasatch and Uinta Mts., Utah). 



Sitta caroUnensis, /S. aculeata Eidgway, Field and Forest, iii, May, 1877, 196 

 (Colorado). 



/S[iWa] c[aroUnensis'] aculeata Coues, Key N. Am. Birds, 2d ed., 1884, 271, part. — 

 Bailey (Florence M.), Handb. Birds W. U. S., 1902, 453, part. 



Slitta} caroUnenm aculeata Ridgway, Man^ N. Am. Birds, 1887, 559, part. — 

 Hellmaye, Tierreich, 18 Lief., 1903, 188, part (northern Rocky Mts.). 



Sitta caroUnensis nelsoni Mearns, Proc. U. S. Nat. Mus., xxiv, no. 1274, June 2, 

 1902, 918(HuachucaMts., Arizona; coll. U. S. Nat. Mus.). —Bailey (Florence 

 M.), Handb. Birds W. U. S., 1902, 453, footnote. 



Slitta} caroUnensis nelsoni Hellmaye, Tierreich, 18 Lief., 1903, 188. 



SITTA CAROLINENSIS MEXICANA Nelson and Palmer. 

 MEXICAN NTTTHATCH. 



Similar to S. c. nelsoni., but with relatively much smaller bill and 

 coloration of under parts decidedly darker, especially the sides and 

 flanks, only the throat and sides of head and neck bemg pure white, 

 the other under parts grayish white or pale gray medially, deepening 

 into deep bluish gray (slightly paler than back) on flanks. 



Adult male.— 'Length (skins), 124-136 (130.6); wing, 88.5-98.5 (91.8); 

 tail, 44.5-53 (47.5); culmen, 16-19 (17.8); tarsus, 16.5-19 (17.6); mid- 

 dle toe, 13-16 (14.5).« 



Adult female.— Length (skins), 123-135 (129.7); wing, 86.5-91.5 

 (89.2); tail, 42-48 (45.2); culmen, 16.5-19(17.8); tarsus, 16.5-18(17.3); 

 middle toe, 13-15 (14.2).'' 



« Twenty specimens. 6 Seven specimens. 



