120 BULLETIN 86, UNITED STATES NATIONAL MUSEUM. 



Type-locality. — Pebas, Peru. 



Geographical distnhution. — Resident in eastern and central Peru: 

 north to Pebas and Yquitos, northern Peru; west to the Huallaga 

 Eiver, central Peru; south to the upper Ucayali River, southern 

 Peru; and east to the latter locality and to Pebas in northeastern 

 Peru. 



Remarks. — Although the writer has seen but a single specimen of 

 this race, it is apparently easily recognizable by the character of the 

 white markings on the primaries alone, though it can be distin- 

 guished also by its other characters. It differs from Chordeiles ru- 

 pestris xyostictus in having somewhat shorter wings and tail ; in the 

 female, by reason of its rather darker and decidedly less buffy upper 

 surface ; rather larger dark brown markings on head, back, scapulars, 

 and wing-coverts; a large white patch on the fourth primary; dark 

 brown bars, instead of only spots, on the inner vane of outermost tail- 

 feather; and less buffy jugulum. C. E. Hellmayr mentions^ the 

 darker upper surface of Peruvian specimens of Chordeiles rupestrisy 

 but gives no other differences. 



The probable range of this subspecies is as above outlined, but since 

 we have examined actual specimens from only Pebas, Peru, its geo- 

 graphical limits may be subject to change when adequate material 

 is available. 



1 Hellmayr, Novit. Zool., vol. 17, December, 1910, p. 378. 



