144 Allen's naturalist's library. 



'' In addition to their ' Bob-AA'hite ' 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 0. ri'^gmianus. Average 

 measurements of the pure white eggs, i"25 by i inch. 



VI. THE COYOLCOS COLIN. ORTYX COYOLCOS. 



Te^mo coyo/cvs, 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). 

 Adnlt Male. — Like the males of O. pedoralis £ind 0. graysoni^ 

 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 with brown ; and the eyebrow-stripes, if present, 

 are ivhite, 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 O. ridi^wayi, but smaller. 

 Measurements as in the male. 



Range. — 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 XXXIIL) 



Adult Male. — Like the male of O. coyolcos, but the top of the 

 headj eyebrows-stripe, chin, and throat are all 2i7nform blacky 



