66 BULLETIN 98, UNITED STATES NATIONAL MUSEUM. 



Juvenal male, No. 170976, U.S.N.M.; Pulo Siantan, August 20, 

 1899. 



Adult female, No. 171061, U.S.N.M.; Pulo Telaga, September 15, 

 1899. Length, 105 mm. 



The adult males exhibit little individual color variation except on 

 the posterior lower parts, which are in some specimens darker, more 

 slaty. The colors of the plumage are apparently unaffected to any 

 appreciable degree by wear, except that the red of the upper parts 

 becomes rather duller in late summer. All the adult males taken 

 between August 20 and September 19, inclusive, are more or less in 

 process of molt. 



The male in juvenal plumage is at first practically like the adult 

 female, though somewhat darker and duller or more bror.zy, and 

 usually with a touch of red on chin, throat or back. From this stage 

 it passes directly into the adult livery by molt in the first autumn. 

 One of Doctor Abbott's specimens (No. 170980, U.S.N.M.) is all in 

 female plumage, except for a very slight wash of red on the chin; 

 another (No. 171055, U.S.N.M.) is similar, though darker and duller 

 on the anterior lower parts, and with a slight reddish wash over most 

 of the throat; another (No. 170978, U.S.N.M.) is like the last, but with 

 a more extensive and conspicuous red gular patch; while a fourth 

 lacks entirely the red on chin and throat, but has a large red area on 

 the back. In all four of the juvenal males just mentioned the red- 

 tipped feathers are evidently of the juvenal plumage, because they 

 have olive-green bases, not blackish or white as have the red feathers of 

 the adult. One immature male (No. 171053, U.S.N.M.) taken, August 

 31, 1899, is still in partly juvenal plumage, but has already acquired part 

 of the adult dress in the brownish gray posterior lower parts; the 

 yellow rump; the purple upper tail-coverts; purplish rectrices, though 

 most of these are but partly grown ; a fine of red feathers down the 

 middle of the throat, and many scattered red feathers on the sides 

 of the neck, on cervix, back, and scapulars; and a few purplish 

 metallic feathers on the forehead and in the submalar streak. The 

 remaining juvenal male (No. 170976, U.S.N.M., Aug. 20) is in the 

 plumage of the female, except for a reddish wash on the throat, and 

 a few scattered bright-colored feathers of the adult livery, into which 

 it is just beginning to molt. 



Doctor Abbott reports that he found this species abundant on 

 Pulo Manguan; and that in early September it was the commonest 

 sun-bird on Pulo Siantan, where it inhabits the thick forest. 1 



Measurements of all the adults in Doctor Abbott's collection are to 

 be found in the following table: 



i For the character of this forest see plate 2, upper figure. 



