. A monograph of the genus Chordeiles Swainson, type of a new family of goatsuckers . is apparently easily recognizable by the character of thewhite 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 thefemale, by reason of its rather darker and decidedly less buffy uppersurface; rather larger dark brown markings on head, back, scapulars,and wing-coverts; a large white patch on the fourth primary; darkbrown bars, instead of only spots, on the inner vane of
. A monograph of the genus Chordeiles Swainson, type of a new family of goatsuckers . is apparently easily recognizable by the character of thewhite 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 thefemale, by reason of its rather darker and decidedly less buffy uppersurface; rather larger dark brown markings on head, back, scapulars,and wing-coverts; a large white patch on the fourth primary; darkbrown bars, instead of only spots, on the inner vane of outermost tail-feather; and less buffy jugulum. C. E. Hellmayr mentions^ thedarker upper surface of Peruvian specimens of Chordeiles rupestris^but gives no other differences. The probable range of this subspecies is as above outlined, but sincewe have examined actual specimens from only Pebas, Peru, its geo-graphical limits may be subject to change when adequate materialis available. 1 Hellmayr, Novit. Zool., vol. 17, December, 1910, p. 378. U. S. NATIONAL MUSEUM BULLETIN 86 PL. 1.
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Keywords: ., bookcentury1900, bookdecade1910, bookidmonograp, booksubjectbirds
