520 niEDS; OF THE GALAPAGOS ARCHIPELAGO— BIDGWAY. vol.xix. 



clouded with dusky, and feathers of chest and breast with smaller, 

 more longitudinal, spots of more brownisli duskj-. Bill wholly black 

 and legs and feet dusky, as in the preceding. Length (skin). 4.40; wing, 

 2.70; tail, l..")7; culmen, 0.71; gonys, 0.38; basal width of mandible, 

 0.45; basal depth of bill, 0.58; tarsus, 0.00; middle toe, 0.63. 



jiditlt female. — No. I^.IOIO, T.S.X.M.; same locality, etc. Similar to 

 the supposed immature male last described, but pileum dusky sooty 

 brownish with grayish brown edgings, instead of nearly uniform dusky; 

 under parts with dusky longitudinal spots and streaks slightly less 

 distinct; bill with terminal third of maxilla and greater part of mandible 

 brownish; legs and feet brownish dusky. Length (skin), 4.50; wing, 

 2.70; tail, l.CO; culmen, 0.72; gonj's, 0.40; basal widtb of mandible, 

 0.44; basal depth of bill, 0.59; tarsus, 0.00; middle toe, 0.03. 



Young malef.^ — No. 115945, U.S.N.M.; same locality, etc. Essen- 

 tially like the supposed immature male (No. 115943) described above, 

 but uj^per parts more tinged Mith olive-brown, greater wing coverts 

 edged with ligbt butty brown, and dusky color of anterior under parts 

 much less intense, being dull grayish dusky instead of sooty black; 

 mandible pale brownish yellow with a large squarish or trapezoidal 

 dusky spot on each ramus. 



Younfi female f. — No. 125920, U.S.N.M. ; same locality and collector, 

 March 30, 1891. Much lighter colored, both above and below, than the 

 supposed 3'oung male (No. 115945), the general color of the upper parts 

 being rather light brownish olive, the feathers of the pileum and t.ick 

 with dusky central spots; anterior under jjarts with tlie dull grayish 

 dusky streaks about equal in width to the dull butty grayish white 

 interspaces; terminal portion of maxilla yellowish, and dusky spot on 

 mandibular rami smaller. 



A series of thirteen adult males from Chatham Island, compared with 

 five from Charles Island, shows that the birds from the two localities 

 can not properly be considered the same. Altogether there are in the 

 National Museum and Dr. Baur's collections thirty-one specimens, 

 nearly half of which are adult males in the black plumage, of the 

 present form, and of these only three specimens (all males in the 

 striped plumage, but with black bills) which approach very closely in 

 size and shape of the bill to the stoutest billed examples from Charles 

 Island. 



I think there can be no question that (Tould's Gcospiza duhia was 

 based on a young example of this form. In the large series of speci- 

 mens now before me (thirty-one altogether) are several which answer 

 in every i)articular to the original description excei)t in a single meas- 

 urement, that of the depth of the bill, which is given as three-eighths of 

 an inch. None of the specimens before me have the bill less than one- 

 half an inch in depth at the base, the average being about five-eighths, 



'This specimen is marked " 9/ l^i't ^ ilouljt the eorrectuess of tlio determiuatiou 

 of sex. 



