THE GENUS CHOEDEILES SWAINSON — OBEBHOLSER. 115 



Chars, svbsp. — 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 

 immarked, 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. — ^Male:^ Wing, 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 culmen, 5.0 ; tarsus, 

 12 ; middle toe, 13. 



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



Geographical distribution. — ^Permanently resident in northern and 

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



^ Two specimens, from Brazil. 

 ' One specimen, from Brazil. 



