399 
Mr. R. Swinhoe on Formosan Ornithology. 
brown colour, almost similar to those of the Nightingale, were 
brought to me on the 21st August 1861. The native declared 
them to be the eggs of the Koo-lew. The eggs vary only tri- 
flingly in size, the largest being 1 in. by *82. 
115. Bambusicola sonorivox, Gould, P. Z. S. 1862, p. 285. 
Native name, Te'ek-koe (Bamboo-fowl). 
This and the cognate form from the Foochow hills, Perdix 
sphenura, J. E. Gray (Perdix thoracica, Temm.), Mr. Gould has, 
at my suggestion, separated into a distinct genus. 
Bill leaden black, the upper mandible having a brownish 
white tip. Legs, toes, and spurs dark brownish olive-green, 
blacker on the toes, and whitish brown on the claws. 
Length 9J in.; wing 5^; tail 3^, of 14 rectrices, much 
graduated, the outer one being 1^ shorter than the central, 
ends rounded. Wing much rounded; the 4th, 5th, 6th, and 7th 
quills nearly equal and longest. The hind tarsi armed with a 
sharp conical spur in the male, which is in the female replaced 
by a wart. Face, hindneck, and breast dark smoke-grey, mottled 
with very small dark specks; the feathers on the crown rufescent, 
with dark centres and rufous margins. Throat deep maroon- 
colour. Under parts ochreous clay-colour, most of the feathers 
being stamped with a large quadrangular spot of maroon. 
Axillaries brown, striated with a deeper shade. Tibial feathers, 
abdomen, and vent olive-grey in the male, clay-colour in the 
female, the vent with reddish-black spots. Feathers of the back 
olive-grey, finely mottled with black, and marked with a large 
central deep-maroon drop; the scapulars similarly coloured, 
with the addition of a white spot on the outer web of each; on 
the wing-coverts the grey gives place to light yellowish brown, 
and the white spots to ochreous. Primary quills deep brown, 
rufous on the outer web, mottled with black, and edged with 
light rufous brown; secondaries with a black ochreous mottling; 
tertiaries the same, having in addition an ochreous spot on the 
outer web, and a large spot of black-edged deep maroon near 
their tips. The white and ochreous spots on the wings and 
their coverts are of different shapes, varying from an arrow-head 
to an annular form. Lower back, rump, and upper tail-coverts 
