342 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
it was impossible on the wing to distinguish one from the other, and on one or two 
occasions Mr. Hamilton actually killed moths with a pellet from the blowpipe, mis- 
taking them for the humming! jirds. 
POPELAIRIA POPELAIRII (Du Bus). 
Trochilus jwpelairii Du Bus, Esq. Orn., 1S46, pi. vi. 
Popelairea pnpelmrei Simon, Cat. Troch., 1897, p. 41. 
One adult male from Archidona, east Ecuador. 
POPELAIRIA LANGSDORFFI (Temminck). 
Trochilus Umgsdorffi Temmhsck, Planch. Color., 1821, ])1. lxvi, fig. 1. 
Popelaria langsdorffi Eidgway, Proc. U. S. Nat. Mus., Ill, 1880, p. 315. 
One specimen from Coca, Rio Napo, east Ecuador. This is an 
immature male, differing from the adult of the same sex in the lack of 
the long tail-feathers and in the slight indication of the reddish bronze 
breast patch. 
POPELAIRIA CONVERSII AEQUATORIALIS ( Berlepsch and Taczanowski). 
Gouldia conversi aequutorialit Berlepsch and Taczanowski, Proc. Zool. Soc. 
Lond., 1883, p. 567. 
Popelairia conveivi aeqiuitorialis Hartert, Novit. Zool., V, 1898, p. 494. 
Five specimens from Santo Domingo and Nanegal, west Ecuador. 
Among the females there is consideral)le difference in the amount of 
white on the posterior lower surface. The female of this species may 
be distinguished from that of Popelairia langsdoi'jji by its shorter bill 
and more solidly black throat. 
