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 brorzy, 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 ard duller 
on the anterior lower parts, and with a shght reddish wash over most 
of the throat; another (No. 170978, U.S.N.M.) is ike 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 mer tiored 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 line 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; ard 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. 
Measurements of all the adults in Doctor Abbott’s collection are to 
be found in the following table: 
1 For the character of this forest see plate 2, upper figure. 
