THE THICK-BILLED PARTRIDGES. 159 
Range.—Central South America, extending westward to 
Eastern Ecuador and Eastern Peru, eastwards to Borba, Rio 
Madiera. 
Habits—Mr. E. Bartlett always found this species in 
coveys of from ten to twelve birds. In Eastern Peru 
he met with young birds just able to fly in the month of 
July. 
X. THE SPOTTED PARTRIDGE. ODONTOPHORUS GUTTATUS. 
Ortyx guttata, Gould, P. Z.S. 1837, p. 79. 
Odontophorus guitatus, Gould, Monogr. Odontoph. pt. i. pl. 
28 (1846) ; Ogilvie-Grant, Cat. B. Brit. Mus. xxii. p. 439 
(1893). 
Odontophorus consobrinus, Ridgway, P. U.S. Nat. Mus. xvi. p. 
469 (1893). 
Adult Male——Above very similar to O. guianensis, but the 
nape and mantle olive-brown instead of grey; forehead and 
fore-part of crest brownish-black ; hinder-part bright rust-red ; 
cheeks, chin, and throat d/ack with white shaft-stripes ; general 
colour of the under-parts drowaish-buff, with white black-edged 
spots. Totallength, 110 inches ; wing, 59; tail, 2°8; tarsus, 
1°7; middle toe and claw, 1°9. 
Adult Female-—Differs from the ma/e in having the whole 
crest brownish-black ;* and well-marked witish-buff shaft- 
stripes to the feathers of the mantle, which are scarcely visible 
in fully adult males. Specimens from Costa Rica and Chiriqui, 
where the ranges of this and the following species overlap, are 
somewhat intermediate, having the under-parts more or less 
washed with rufous. 
Range.—Central America ; Southern Mexico to Chiriqui. 
* In younger examples the under-feathers of the crest are mixed with 
rufous, 
