144 LLOYD'S NATURAL HISTORY. 
“Tn 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. cirginianus. Average 
measurements of the pure white eggs, 1°25 by 1 inch. 
VI. THE COYOLCOS COLIN. ORTYX COYOLCOS. 
Tetrao coyolcos, P.L. S. Mull. S. N. Suppl. p. 129 (1776). 
Ortyx coyolcos, Gould, Monogr. Odontoph. pt. iii. pl. 6 right- 
hand fig. (1850) ; Ogilvie-Grant, Cat. B. Brit. Mus. xxii. 
Pp. 423 (1893). 
Adult Male-—Like the males of O. fectoralis and O. graysont, 
and, as in the last species, the chin and throat are black, but 
the chest ts black ; the feathers of the top of the head are 
black, edged zwith brown ; and the eyebrow-stripes, if present, 
are w/ztfe, and indistinctly represented. ‘Total length, 7°7; 
wing, 4°2; tail, 2°3; tarsus, 1°15; middle toe and claw, 1°4. 
Adult Female—Like that of O. vidgwayi, but smaller. 
Measurements as in the male. 
Range.—Oaxaca, Southern Mexico. 
VII, THE BLACK-HEADED COLIN. ORTYX ATRICEPS. 
Ortyx coyolcos, Gould (mec Miill.), Monogr. Odontoph. pt. iii. 
pl. 6 left-hand fig. (1850). 
Ortyx atriceps, Ogilvie-Grant, Cat. B. Brit. Mus. xxii. p. 424 
(1893). 
(Plate XXXTIIT,) 
Adult Male-—Like the male of O. coyolcos, but the top of the 
head, eyebrow-stripe, chin, and throat are all wzzform black, 
