582 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



ix, 1858, 368; Cat. N. Am. Birds, 1859, no. 272; Review Am. Birds, 1864, 

 141.— Verrill, Proc. Essex Inst., iii, 1862, 149 (Oxford Co., Maine).— Law- 

 rence, Ann. Lye. N. Y., viii, 1866, 283 (near New York City). — Coues, Proc. 

 Essex Inst., v, 1868, 278.— Turnbull, Birds E. Penn. and N. J., 1869, 27; 

 Phila. ed., p. 20. 



Troglodytes americajia Breweu, Journ. Bost. Soc. N. H., 1837, 437. 



Traglodytes americanus Thompson, Nat. Hist. Vermont, 1853, 85. 



Hylemathrous americanus Cabasis, Journ. fiirOrn., 1860, 407. 



T[roglodyies] sylvestris (not of Gambel) Cabanis, Mus. Hein., i, 1850, 78. 



TROGLODYTES AEDON PARKMANII (Audubon). 

 WESTERN HOTJSE WREN. 



Similar to T. a. aedon, but decidedly paler and grayer, with back and 

 scapulars usually distinctly barred with dusky (very rarely with bars 

 obsolescent), and size averaging- slightly larger. 



Adult male.— luengih (skins), 98-130(113); wing, 49.5-55.5 (52.6); 

 tail, 3S-50 (-tl.S); exposed culmen, 11.5-14 (13); tarsus, 15.5-18 (17.2); 

 middle toe, 11-13.5 (12). « 



Adidtfeynale.— length (skins), 98-120 (111); wing, 18-51 (51); tail, 

 39.5-17 (11.2); exposed culmen, 11-13 (12.7); tarsus, 10-18.5 (17.2); 

 middle toe, 10-13 (11.7).^ 



« Forty -three specimens. 

 6 Twenty-seven specimens. 



Specimens from different geographic areas compare in average measurements as 

 follows: 



With a very large series (more than 250 specimens) for comparison I am unable to 

 appreciate even the most minute average difference between specimens from the 

 Pacific coast district and those from the interior (as far eastward as the eastern bor- 

 der of the prairie districts of the Mississippi Valley), and consequently can find no 

 reason for recognizing two forms. 



