DYSON'S PUFFBIRD 



Key to the Puffbirds 



a. Plumage mostly black above; white below, with a 

 black band across chest. 



b. Larger, length 206 mm. (8.10 in.) or more; white 

 collar across hindneck ; tail not spotted with white. 



c. Forehead white; white collar complete around 

 neck Notharchus hyperrhynchus leucocrissus 



cc. Forehead black; black of chest extensive, inter- 

 rupts white collar on sides of neck 



Notharchus pectoralis 



bb. Smaller, length about 147 mm. (5.75 in.); white 

 collar does not extend across hindneck; tail and 



back with white spots 



Notharchus tectus subtectus 



aa. Plumage brownish or slate color, not white below, 

 b. Plumage brownish above; bill not red. 



c. Larger, length 181 mm. (7.10 in.); plumage vari- 

 ously spotted and streaked with buffy; bill dark 



above, paler below, deep at base 



Malacoptila p. panamensis 



cc. Smaller, length 140 mm. (5.50 in.) ; plumage un- 

 spotted and unstreaked; bill bluish gray, long 

 and narrow Nonnula frontalis 



bb. Plumage slate color; bill red 



Monasa fidelis, Monasa similis 



i. Notharchus hyperrhynchus leucocrissus 



(Cabanis and Heine) 



Dyson's Puff bird 



Notharchus hyperrhynchus dysoni RIDGWAY, Birds of 

 N. and M. Amer., VI, p. 576, 1914; STONE, Proc. Phila. 

 Acad. Nat. Sci., 1918, p. 259. 



Length 239 mm. (9.45 in.); tail 86 mm. 

 (3-35 in.). 



Sexes alike. Forehead and front of crown, 

 chin, throat, chest and a collar across the hind- 



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