614 
Mr. G-. L. Bates on the 
to me, one identified by the two large nestlings (Nos. 3713, 
3714) and the others by female birds all shewing signs of 
sitting. These nests were deep cups made entirely of strips 
of the leaf-sheaths of the cane-like grass esong (plural bisong ), 
amongst which the birds spend all their lives and from 
which they get their Bulu name. These birds do not spare 
material in building their nests, and one which was in a 
Text-fig. 19. 
A B C d 
A. Tongue of young Calamocichla rufesccns, see p. 613. B. Tongue of 
nestling Burnesia bairdi, see p. 615. C. Tongue of half-fledged 
young Prinia mystacea. D. Tongue of nestling Sylviella denti, see 
p. 621. 
very acute-angled triple fork of esong had a base more than 
eight inches deep, all the angle being filled up to a height 
where it was large enough for the cavity of the nest. 
The nestlings had the swollen margin of the gape whitish, 
the inside of the mouth orange-yellow, and a pair of large 
black tongue-spots. 
Of the other nests one contained a single egg (No. 301) 
measuring 19 X 14 mm.; the other contained two (Nos. 592, 
593) measuring 20 X 15 and 19*5 x 14 mm. 
[Three eggs are of a rather wide oval form and almost 
devoid of gloss. They are white or pale greenish-white 
rather sparingly marked all over the shell with small spots 
and blotches of yellowish-brown, dark grey, and light grey, 
the markings being more numerous towards the larger 
end.—W. R. O.-G.] 
