THE GENUS CHOKDEILES SWAINSON OBERHOLSER. 115 



Chars, sicbsp. — Size small; colors relatively dark; blackish and 

 dark brown markings of upper surface rather coarse ; breast sparsely 

 spotted; female with only dark brown spots on inner webs of outer 

 rectrices; and with no large white patch on inner vane of fourth 

 primary (counting from the outermost). 



Description.— Adult [male], No. 21995, Academy of Natural Sci- 

 ences of Philadelphia ; Rio Negro, Brazil ; M. Wiilf. Upper surface 

 broccoli brown, spotted, streaked, barred, and vermiculated with 

 grayish sepia, most heavily on pileum, scapulars, and upper tail- 

 coverts, and in places tinged with buff, the outer margins of scapu- 

 lars almost entirely buff; tail white, the two middle feathers hair 

 brown, irregularly barred and finely mottled with dark brown; the 

 outer vane of outermost rectrix (excepting a very narrow white 

 edge and a broad subterminal white space) and broad tips on all the 

 rectrices, save the middle pair, dark brown, between clove brown 

 and hair brown; primaries of the same brown, the four outermost 

 unmarked, the next four with their bases (excepting the outer 

 vanes) and all but the broad brown tips, pure white; rest of pri- 

 maries and all of secondaries narrowly tipped with whitish and 

 otherwise all white save for broad, dark brown ends ; anterior rows 

 of superior wing-coverts dark brown like the wing-quills, spotted 

 and imperfectly barred with buff and whitish; remainder of wing- 

 coverts deep broccoli brown, spotted, barred, mottled, and tipped 

 with white, cream color, pale clay color, and buff; tertials broccoli 

 brown, terminally dull buff, with shaft streaks and broken, irregu- 

 lar bars and vermiculations of deep broccoli brown; sides of head 

 and neck broccoli brown, with fine markings of dark brown, the 

 auriculars buffy and nearly plain; an indistinct buffy white super- 

 ciliary stripe; entire lower surface creamy white, the jugulum with a 

 wide, grayish buff, partly whitish band, obscurely barred and spotted 

 with broccoli brown; lining of wing white, excepting the outer 

 coverts, which are dark brown like the wing-quills, and the posterior 

 ones, which are grayish drab; edge of wing along the alula mostly 



white. 



Measurements.— Uale:^ ^Ymg, 167-170 (average 168.5) mm.; tail, 

 94; exposed culmen, 6.5; tarsus, 13-13.5 (13.3) ; middle toe, 13-13.2 



(13.1). 

 Female : ^ Wing, 159.5 mm. ; tail, 90 ; exposed cuhnen, 5.0 ; tarsus, 



12; middle toe. 13. 



Type-Ioeality.— -Rocky islands of the Eio Negro, northern Brazil. 



Geographical distrihutio7i.—'Permsinent\j resident in northern and 

 central Brazil and northeastern Bolivia : north to Para and the upper 



1 Two specimens, from Brazil. 

 - One specimen, from Brazil. 



