Zila. 
21ND: 
+211. 
211d. 
124 
Herpetotheres cachinnans queribundus Bangs 
and Penard, Bull. Mus. Comp. Zool., 1xiii., 
p. 23 (1919). [Pernambuco, type in M.C.Z. 
Harvard. } 
Brazilian Laughing Hawk. 
Size of typical form (wing ¢ 258-67), but 
very pale in colouration. 
Herpetotheres cachinnans mastus Bangs & 
Penard, Auk. xxxv., p. 444 (1918). [Bella- 
vista, Peru, type in M.C.Z. Harvaid.] 
Peruvian Laughing Hawk. 
Small pale form; wing ? 235 mm. ; head 
and under parts much whiter. 
Herpetotheres cachinnans fulvescens Chapm., 
Bull. Am. Mus. N.H., xxxiv., p. 638 (1915). 
[Alto Bonito, R. Sucio, W. Colomb., type in 
Amer. Mus. N.H.] 
Western Laughing Hawk. 
Wing ¢ 253-258, 9 270 mm. ; smaller and 
more richly coloured; below nearly uni- 
form deeper buff ; head deeper buff. 
Herpetotheres cachinnans chapman Bangs 
& Penard, Bull. M.C.Z., Ixii., p. 37 (1918). 
[Quintana Roo, Mexico, type in M.C.Z. 
Harvard]. 
Wing 3 270-275, 2 300 mm.; large pale 
form ; upper parts paler ; head and under 
parts whiter ; tail with the bands extending 
across feathers. 
Brazil 
(Pernambucc) 
to Paraguay. 
N.W. Peru. 
W. Ecuador and 
W. Colombia 
(Pacific side of 
Andes), N. to 
Panama ; also 
S. Nicaragua 
(W. Sclat.). 
Mexico, from 
Tepic and 
Talasco, S. to 
N. Nicaragua. 
2 A Paraguayan ¢ in Brit. Mus. has a wing measurement of 298 mm, 
