THE THICK-BILLED PARTRIDGES, EES 
takes itself to the branches of trees. It has two distinct notes ; 
one a rather loud whistling call, which may be heard at morn- 
ing and evening, the other a sound like “Tock’ro,” whence its 
Macusi name. It is also known as the Duraquara. 
Mr. T. K. Salmon writes :—“ When wandering one morning 
in the forest I saw a pair engaged in the work of nest-making. 
The male was in the nest; and the female appeared to be 
building around him. The female made off at my approach, 
but the male continued in the nest until I nearly put my hand 
on him, no doubt trusting to his dark colour among the leaves 
to escape detection. I do not think I should have seen him 
had it not been for the scarlet over the eye? 
Nest.— Builds its nest into a bank or side of the ground in 
the high forest, with a tunnel-like entrance made of interlaced 
twigs and sticks, or, perhaps, more properly speaking, with a 
neatly executed bow in front of the nest, which is merely a hole 
scraped in the ground and lined with dead leaves, (SaZmon.) 
Eggs.—Six to eight in number; white ; measurements, 1°5 
by 1°r inch, 
SUB-SP. a. THE MARBLED PARTRIDGE, ODONTOPHORUS 
MARMORATUS, 
Orityx (Odontophorus) tarmoraus, Could, 2. 7. S. 1845 D. 
Io7, 
Odontophorus pachyrhynchus, Tschudi, Fauna Peruana, p. 282 
(1844-46) ; Gould, Monogr. Odontoph. pt. ui. pl. 24 
(1850). 
Odontophorus marmoratus, Ogilvie-Grant, Cat. B. Brit. Mus. 
XXIl. P. 433 (1893). 
Adult Male and Female.—Appear to be distinguished from Q. 
guianensis by having the sides of the head and chin rust-red, 
and the general colour of the under-parts darker, and almost 
invariably barred with black and buff. The sexes do not 
appear to differ in size, and the measurements are rather larger 
