230 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 55. 



Female: ^ wing, 50-54.5 (average, 51.7) mm.; tail, 30.5-33.5 (32.3) ; 

 exposed culmen, 12-13.5 (12.9) ; tarsus, 17-18.5 (17.7) ; middle toe 

 without claw, 12-13.5 (13). 



Type-locality. — St. George Island, Pribilof Islands, Alaska. 



Geographic distrihution.—'Pvihiloi Islands, Alaska. 



Remarks. — This island race differs from Nannus troglodytes me- 

 ligerus in its shorter culmen, tarsus, and middle toe ; more ruf escent 

 upper parts; more uniform, less heavily barred posterior lower 

 parts; and much more deeply ochraceous under surface. It was origi- 

 nally described from a very imperfect, immature example, and not 

 until now could a satisfactory series of adult birds be had for 

 comparison. This series shows that the bird from the Pribilof Is- 

 lands, which must be true Nannus troglodytes alascensis, is subspe- 

 cifically different from all the birds of the Aleutian Chain, including 

 Unalaska Island. It appears to be confined to the islands of St. 

 George and St. Paul in the Pribilof group. 



Detailed measurements of adult specimens examined are as follows: 



Measurements of specimens of Nannus troglodytes alascensis. 



a Used in measurement averages on pp. 229-230. 

 NANNUS TROGLODYTES TANAGENSIS, new aabssjccies. 



SubspecifiG characters. — Similar to Nannus troglodytes kiskensis, 

 but wing somewhat longer; upper parts more ruf escent and rather 

 lighter, especially on the lower back, rump, and upper tail-coverts; 

 posterior lower parts on the average less heavily barred, and with 

 the bars less blackish; the entire under surface averaging lighter 

 and somewhat more ochraceous. 



1 Five specimens, from the Pribilof Islands, Alaska. 



