52 Mr. W. R. Ogilvie Grant on the 



Key to the Genus Pteriiistes. 



A. Feathers of tlie back and scapulars with dark 

 bi-own shaft-stripes. 



a. Neck-feathers black, with white or pale b ufF 



margins. 

 rt\ Feathers of the lower breast and belly uni- 

 form black, or black or rufous-brown with 

 a white band down the centre, and often 

 a blackish shaft-streak, 

 a". Feathers from the gape to the cheek 

 black (freckled with white in the fe- 

 males and young). 

 a^. Sides of the feathers of the lower 



breast and belly black ; witli spurs . . P. nudieollis, cS . 

 P. Sides of the feathers of the lower 

 breast and belly rufous brown ; no 



spurs P. nudieollis, ^ • 



b^. Feathers from the gape to the cheek white. 

 c^. Feathers of lower breast and belly 



black P. humboldti, J , 



d^. Feathers of the lower breast and belly 

 black, with a narrow white stripe 



down the middle P. humboldti, $ , 



b^. Feathers of the lower breast and belly 



white, with a wide central band of black 



down the middle of each feather. 



c^. Upper chest grey, each feather finely 



dotted towards the e.vtremity with 



black ; with spurs P. afer, cJ . 



<f . Chest brownish grey, with black shaft- 

 stripes ; no spurs P. afer, $ . 



c\ Feathers of the lower breast and belly 

 white, finely vermiculated with black, 

 and widely margined with chestnut. 



e^. Without black shaft-streaks P. crancin, (5 $ . 



/*. With black shaft-streaks P. boeh7ni, J $ • 



d^. Feathers of the lower breast and belly 

 umber-brown, like those of the back, with 

 dark shaft-streaks ; feathers of the middle 

 of the belly mottled on the sides. 



g^. Edged with dark chestnut P. swainsoni, cf . 



h^. Not edged with chestnut P. sivainsoni, 5 ■ 



b. Neck-feathers white, with black and rufous- 



brown margins ; under surface white, with 

 broad rufous-brown margins and black shaft- 

 stripes P. niffij>irfii.t. 



