120 BULLETIN 86, UNITED STATES NATIONAL MUSEUM. 



Type-locality. — Pebas, Peru. 



Geographical distribution. — Resident in eastern and central Peru: 

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

 River, 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 rupestris^ 

 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. 



