NO. 2265. THE WREN GENUS NANNU8 BILLBERG—OBERHOLSER. 231 



Description.— Tyye, adult male, No. 230245, U.S.N.M., Biological 

 Survey Collection; Tanaga Ba}^, Tanaga Island, Aleutian Islands, 

 Alaska, June 25, 1911; A. Wetmorc; original number, GOT. Pileum 

 dull olive brown, the forehead faded to a lighter shade; back Sac- 

 cardo's umber; rump and upper tail-coverts between cinnamon 

 brown and tawny, with obsolescent dark brown bars; tail basaily 

 of the same color as the rump, terminally sayal brown, paling in 

 some places to bufly, and narrowly barred throughout with dark 

 brown or blackish ; wings fuscous, broadly barred on the outer V\ebs 

 of quills and coverts with sayal brown and buff; lores fuscous; broad 

 postocular stripe dull olive brown; cheeks and sides of neck dull 

 cinnamomeous, more or less mixed with fuscous ; lower parts, includ- 

 ing edge of wing, between cinnamon and cinnamon buff, paler on 

 chin and medial portion of abdomen; flanks and sides sayal brown; 

 abdomen, flanks, and crissum, spotted or irregularly barred with 

 blackish brown or brownish black. 



Measurements. — Male:^ wing, 52-55 (average, 53.4) mm.; tail, 

 28.5-33.5 (32) ; exposed culmen, 11-16 (15.1) ; tarsus, 18-19.5 (18.8) ; 

 middle toe without claw, 13-14.5 (14). 



Female: 2 wing, 48.5-53.5 (average, .50.5) mm.; tail, 29-32 (31); 

 exposed culmen, 15-15.5 (15.1) ; tarsus, 18-19.5 (18.4) ; middle toe 

 without claw, 13-14 (13.7). 



Tyjje-locality. — Tanaga Bay, Tanaga Island, Aleutian Islands, 

 Alaska. 



Geographic distribution. — Islands of Tanaga, Adak, and Atka, in 

 the Aleutian chain, Alaska, together with probably other interven- 

 ing and adjoining islands. 



Remarks. — This new race is similar to Nannus troglodytes ala- 

 scensis from the Pribilof Islands, but its bill is much longer and its 

 upper parts lighter. Wliile intermediate between Nannus troglo- 

 dytes hiskensis from Kiska Island and the bird occupying Unalaska 

 Island, the present race is sufficiently different from both to necessi- 

 tate subspecific distinction. It is, of all the races inhabiting the 

 Aleutian Islands, the one nearest in characters to Nannus troglo- 

 dytes alascensis of the Pribilof Islands. 



1 Five specimens, from the Aleutian Islands of Tanaga, Adak, and Atka, Alaska. 

 ^ Four specimens, from Tanaga and Adak Islands, Alaska. 



