386 Mr. E. Swinhoe on Formosan Ornithology. 
lateral feathers. Vent pale, broadly tipped with a pale glowing- 
rufous tint. Undershafts of wing and tail-feathers ochreous, the 
underside of the white tips being washed with a pale rufous glow. 
99. Garrulus taivanus, Gould, P. Z. S. 1862, p. 282. 
This small mountain species represents, in Formosa, the Jay 
that frequents the hill countries of South China, from Canton to 
Ningpo, G. sinensis , Gould. The Formosan Jay has a compara¬ 
tively larger bill, and is at once distinguishable from its Chinese 
congeners by its much smaller size, by its black frontal band 
from nostril to nostril, by its whitish ring round the eye, by the 
somewhat different arrangement of blue, white, and black tints 
on the wings, and by the greater extension of white on the mar¬ 
gins of primary quills. Though the members of this genus are 
somewhat migratory, yet their peregrinations are always within 
a limited sphere; and wherever the Jay occurs in isolated loca¬ 
lities, we meet with aberrations from the typical form. This 
apparent rule in this interesting group is highly suggestive. 
I have only one pair from Formosa; but the characters, which 
I now proceed to define, are constant. 
Length 10^ in.; wing 6j^; tail 5 in. (of 12 feathers of nearly 
equal length) ; tarse If; bill along culmen 1 in., from rictus ]i. 
General plumage light vinaceous, greyish on the back and sca¬ 
pulars, and delicately barred on the crown with a deeper shade. 
Eump-band and upper tail-coverts white. Tail black. Abdo¬ 
men and vent white. Bill bluish grey on rather more than the 
basal half; apical portion black. Feathers over the nostrils and 
round the base of the bill black. A ring of white feathers round 
the eye. Legs light ochreous brown, with brown claws. Irides 
light clear blue. Quills black, the 2nd primary margined for 
nearly its whole length with white, the 3rd to a less extent, the 
4th less still, until the inner ones have scarce any indication of 
it; the secondaries with more than their basal half of the outer 
webs having bars of white blending into deep blue and then 
black, in consecutive order. The primary coverts and winglet 
similarly barred, but more closely, the black bars being broader; 
the foremost secondary coverts bluish grey, finely barred with 
indistinct black and blue striae. Lesser coverts vinaceous brown, 
