192 
297a. Falco albigularis pax Chubb, Bull. B.O.C., S.E. Bolivia, 
xxxix., p. 23 (1918). [Charuplaya, Bolivia, N.W. Argentina. 
type in coll. Brit. Mus.] 
Bolivian White-throated Falcon. 
' 
Wing $ 198 mm.; “‘ upper surface dark 
slate grey instead of black; below with 
breast and sides of body dark brown, not 
black, and much more broadly banded 
with white.’’? 
297b. Falco albigularis petoensis (Chubb), Bull. Yucatan. 
B.O.C., xxxix., p. 22 (1918). [Peto, Yuca- 
tan, April 1888, Salv.-Godm. coll., type in 
Brit. Mus. ] 
Yucatan White-throated Falcon. 
Wing ¢ 190, 2 215 mm.; “differs from F. 7. 
albigularis in being slate colour above, with 
black shaft-lines, instead of black with 
slightly paler margins ; bend of wing white 
varied with buff; breast and sides of 
body blackish brown, instead of black, 
and the white bars broader.”’ 
{*298. Falco chicquera chicquera Daud., Traité, u., Indian 
p. 121 (1800). [ex Levaill., Bengal.] Peninsula, 
Red-headed Merlin. E. to Assam. 
Wing ¢ 218, 228 mm. ; head and hind neck 
chestnut red; above pale bluish, with 
remains of blackish cross bars, except on 
back and scapulars ; tail narrowly barred 
with black, with a broad black subterminal 
band and white tips ; eyebrow and mous- 
tachial stripe black; forehead, sides of 
1 A larger series is necessary to show if this form is really separable. I think 
that the blackness of the upper breast and sides is an age character chiefly, as also 
the amount of white. The same remark applies to the next form. Paraguayan 
birds (F. ophryophanes Salvad.) appear to me indistinguishable from typical birds. 
