NO. 1116. 



FEOCEEDINOS OF THE NATIONAL MUSEUM. 



C37 



18; wing, 13.65; tail, 5.65; exposed culmen, 1.68; greatest depth of 

 bill, 0.50; least depth of bill, 0.50; tarsus, 2.30; middle toe, 1.75. 



A(JuU female.^— ^o. 11*6001, U.S.X.M.; Chatham Island, (lalapagos, 

 March 30, 1891; C. H. Townseud. Similar to the adult male, as 

 described above, but head, neck, aud chest browner, with many 

 feathers of the immature i)lumage intermingled with those of the adult 

 livery: under parts darker and decidedly browner gray, the under tail- 

 coverts not approaching grayish white; secondaries and innermost 

 primaries much darker, the former approaching black and with very 

 distinct and broad ash gray tips, the latter with a more or less distinct 

 blackish subterminal spot; tail much darker gray, shaded or suffused 

 on edges of feathers with blackish, crossed by a broad subterminal 

 band of blackish (nearly disappearing on lateral feathers), and marked 

 with more or less distinct terminal spots of gray. Length (skin), 16.75; 

 wing, 13.25; tail, 5.50; exposed culmen, 1.62; greatest depth of bill, 

 0.50; least depth of bill, 0.48; tarsus, 2.18; middle toe, 1.55. 



Immature {second year).— No. 116031, U.S.N.M.; James Island, Gala- 

 pagos, April 11, 1888; C. H. Towusend. Head, neck, chest, and most of 

 ui>per parts sooty grayish brown, the feathers of the mantle with paler 

 margins; rump nuiform grayish brown; upper tail-coverts light gray, 

 marked with a rather indistinct terminal spot of brownish; second- 

 aries dull blackish slate, with paler terminal margins; primaries 

 black, inclining to blackish .slate on innermost quills; tail slaty black, 

 fading into slate-gray basally, especially on inner webs, the lateral 

 feathers with more than basal half of inner web rather light gray; 

 under parts deep sooty gray or grayish brown, laterally lighter brown- 

 ish gray, clouded with a more decided brown hue medially, passing 

 into uniform pale brownish gray on anal region; under tail-coverts 

 brownish gray, passing into a decidedly paler hue on margins. Bill 

 and feet as in adults. Length (skin), 16.80; wing, 13.35; tail, 5.50; 

 exposed culmen, 1.60; greatest depth of bill, 0.48; least depth of bill, 

 0.44; tarsus, 2.22; middle toe, 1.62. 



Measurements of Lams fiiliginofius. 



iNot quite adult, the browner feathers belonging to the immature dress. 



