392 Mr. R. Swinhoe on Formosan Ornithology . 
Testes small and ovate. Stomach heart-shaped, having a some¬ 
what three-lobed appearance, T ^in. long, ^ broad, ^ deep, not 
very muscular; epithelium moderately thick, deeply and closely 
furrowed with ruga?, and filled with minute white larvae. In¬ 
testines about 9 inches long, from ^ to ^ thick, with no caeca. 
The bill of this, as indeed of all species of Woodpeckers, is 
valued by the Chinese for medicine. The name applied to the 
whole group by the Amoy Chinese is Tok-chew , or Wood-tapper. 
105. Centropus viridis. 
Cuculus viridis, Scop. 
C. lepidus et C. affinis , Horsf. 
Chinese name, Bang-king. 
This is the common and only Crow Pheasant of Formosa. It 
abounds throughout the plains and lower hill-ranges of the 
entire island. It is subject to three stages of plumage:—that of 
the first year, when the upper parts are light rufous, banded 
with black, the bands on the tail being broader and tinged 
with green, the throat and under parts being white, washed 
here and there with rufous; that of the second year, when the 
upper parts are brown, streaked chiefly along the shafts with 
light ochreous, the long upper tail-coverts being closely barred 
with greenish black and rufous ochre, the tail being greenish 
black, more or less washed with rufous, the wings rufous more 
or less washed and barred with brown, and the under parts light 
buff, streaked along the shafts with paler, and barred and mottled 
with brown; and that of the third year, or adult plumage, 
when the bill, from a light colour, has become black, the head, 
neck, lower back, rump, tail, and entire under parts (except the 
axillaries, which are still rufous) glistening with dark green, and 
sometimes with purple, the centre of the back, the wings, and 
the scapulars being rufous, many of the feathers of the latter 
and the tertiaries having pale ochreous streaks along their shafts. 
But the period of change is so inconstant, that at the same 
season you can procure specimens in almost every plumage and 
almost every intermediate stage of change. The males are 
generally much larger than the females; but size is in this bird 
exceedingly variable, scarcely two being found to have the same 
