144 Lloyd's natural history. 



" In addition to their ' Bob-White ' they have a second call 

 of ' Hoo-we,' articulated and as clean cut as their * Bob-White.' 

 This call of * Hoo-we ' they use when scattered, and more 

 especially when separated towards nightfall. At this hour I 

 noted that, although they occasionally called 'Bob- White,' they 

 never repeated the first syllable, as in the daytime they now 

 and then attempted to do." 



Nest and Eggs. — Similar to those of O. lirgiJiianus. Average 

 measurements of the pure white eggs, i*2 5 by i inch. 



VL THE COYOLCOS COLIN. ORTYX COYOLCOS. 



Tetrao coyolco^, P. L. S. Miill. S. N. Suppl. p. 129 (1776). 



Ortyx coyolcos, Gould, Monogr. Odontoph. pt. iii. pi. 6 right- 

 hand fig. (1850); Ogilvie-Grant, Cat. B. Brit. Mus. xxii. 

 p. 423 (1893). 



Adult Male. — Like the males of O.pedoralis diud 0. grayso7ii^ 

 and, as in the last species, the chin and throat are black, but 

 the chest is black ; the feathers of the top of the head are 

 black, edged iviih brown ; and the eyebrow-stripes, if present, 

 are zv/iife, and indistinctly represented. Total length, 77; 

 wing, 4*2; tail, 2*3; tarsus, 1*15; middle toe and claw, 1-4. 



Adult Female — Like that of 0. ridgwayi, but smaller. 

 Measurements as in the male. 



Eange. — Oaxaca, Southern Mexico. 



VII. THE BLACK-HEADED COLIN. ORTYX ATRICEPS. 



Ortyx coyolcos^ Gould {nee Miill.), Monogr. Odontoph. pt. iii. 



pi. 6 left-hand fig. (1850). 

 Ortyx atriceps^ Ogilvie-Grant, Cat. B. Brit. Mus. xxii. p. 424 



(1893). 



{Plate XXXIII.) 



Adult Male. — Like the male of 0. coyokos^ but the top of the 

 head, eyebrow-stripe, chin, and throat are all ii?iiforin blacky 



