234 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



NANNUS TROGLODYTES SEMIDIENSIS Brooks. 



Nannus hiemalis semidicnsis Beooks, Bull. Mus. Comp. ZooL, vol. 59, No. 5, 

 September, 1915, p. 40G (Ghoyiet Island, Semidi Islands, Alaska.) 



Suhspecific characters. — Similar to Nannus troglodytes 2:>etrophilus^ 

 but wing, tail, and bill somewhat longer ; upper parts less ref uscent 

 (more grayisli) and somewhat darker; under surface paler, less 

 deeply ochraceous, and posteriorly rather more heavily barred. 



Measurements. — Male;^ wing, 52.5-54 (average, 53.3) mm.; tail, 

 33-35 (34); exposed culmen, 15; tarsus, 18.5-19 (18.8); middle toe 

 without claw, 14-14.5 (14.3). 



Type-locality. — Choyiet Island, Semidi Islands, Alaska. 



Geographic distribution. — S.emidi Islands, Alaska. 



Remarks. — This recently described race differs from Nannus tro- 

 glodytes alascensis in its decidedly longer bill and somewhat longer 

 tarsus and middle toe ; somewhat lighter, less ruf escent upper parts ; 

 and paler, less ochraceous lower surface. It is a distinct subspecies, 

 nearest in characters to Nannus troglodytes tanagensis, but differing 

 from this in somewhat less rufescent upper parts and paler lower 

 surface, particularly on the posterior portion. It appears to be con- 

 fined to the Semidi Islands; and the original specimens, of vdiich the 

 measurements are given below, are the only ones, so far as known, 

 that exist in collections. 



Measurements of specimens of Nannus troglodytes semidiensis. 



a Used in measurement averages on p. 234. 



b Type. 



NANNUS TROGLODYTES HELLERI (Osgood). 



Anorthura hietnalis helleri Osgood, Auk, vol. 18, No. 2, April, 1901, p. 181 

 (English Bay, near Kodiak, Kodiak Island, Alaska). 



JSuhspeciflc characters. — Similar to Nannus troglodytes petrophilus, 

 but smaller, especially the bill; upper surface much darker, more 

 sooty (less rufescent) ; dark bars of lower back, rump, and upper tail- 

 coverts more conspicuous; lower parts darker, and posteriorly more 

 heavily dark-barred. 



^ Two specimens, from the Semidi Islands, Alaska. 



