THE THICK-BILLED PARTRIDGES. I59 



Eange. — 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 guttatus, Gould, Monogr. Odontoph. pt. ii. pi. 

 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 black with white shaft-stripes ; general 

 colour of the under-parts browfiish-buff, with white black-edged 

 spots. Totallength, ii'o inches; wing, 59; tail, 2-8; tarsus, 

 17 ; middle toe and claw, 1-9. 



Adult Female. — Differs from the male in having the whole 

 crest brownish-black ;* and well-marked whitish-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. 



