THE THICK-BILLED PARTRIDGES. 157 
Young Females—Apparently resemble the male parent, and 
have the whole of the under-parts rust-coloured. 
Range.—North-western South America; United States. of 
Colombia, 
VI. THE RUFOUS-BREASTED PARTRIDGE. ODONTOPHORUS 
SPECIOSUS. 
Odontophorus spectosus, Tschudi, Wiegm. Arch. 1843, p. 387 ; 
id. Fauna Peruana, p. 281, pl. xxxiii. (1844-46); Gould, 
Monogr. Odontoph. pt. ili. pl. 25 (1850); Ogilvie-Grant, 
Cat. B. Brit. Mus. xxi. p> 437-(1893). 
Adult Male-—Like the male of O. hyferythrus but dis- 
tinguished by having the general colour of the top of the head 
and upper-parts dark reddish-brown ; the back of the neck and 
mantle with pale buff shaft-stripes ; mottled black and white 
eyebrow-stripes, and d/ack chinand throat. Under-parts bright 
rust-red. Total length, 10 inches; wing, 5°7; tail, 2°2; tarsus, 
1°8 ; middle toe and claw, 1°o. 
Adult Female.—Differs from the sa/e in having the breast and 
belly dark grey. Size rather smaller. 
Range.— Western South America ; Ecuador and Peru. 
VII. THE BLACK-EYEBROWED PARTRIDGE. ODONTOPHORUS 
MELANONOTUS. 
Odontophorus melanonotus, Gould, P. Z. S. 1860, p. 382; 
Ogilvie-Grant, Cat. B. Brit. Mus. xxii. p. 438 (1893). 
Adult—General colour of the upper-parts deep brownish- 
black indistinctly mottled with pale rufous; eyebrow-stripes dark 
brownish-black , chin, throat, and upper breast deep rust-red ; 
rest of under-parts like the back, but with more strongly marked 
sandy rmottlings. Total length, 10 inches; wing, 5:5; tail, 
2°1; tarsus, 2; middle toe and claw, 2°15. 
Nothing is known of the life history of this rare bird, and, 
