QOREOPYRA CINEREICAUD A Lawrence. Grey-tailed Humming-bird. Oreopyra cinereicauda, Lawrence, Ann. Lye. New York, vii. p. 485 (1867), ix. p. 125 (1868).—Sclater & Salv. Nomencl. Av. Neotr. p. 80 (1873).—Elliot, Synopsis of the Humming-Birds, p. 34 (1878).—Eudes-Deslongchamps, Ann. Mus. d’ Hist. Nat. Caen, 1. p. 243 (1880). Oreopyra castaneiventris, Lawrence, Ann. Lye. New York, ix. p. 124 (1868, part.). Mr. Exxior states that this species is closely allied to O. deucaspis, but is distinguished by its ashy white tail; the under tail-coverts are also paler and the bill is longer (culmen ¢ inch). The female resembles that of O. /eucaspis, but has the bill longer than in that species. It appears to be confined to Costa Rica. The figures in the Plate represent two males and a female of the size of life. OREOPYRA LEUCASPIS, Gow. White-throated Humming-bird. Oreopyra leucaspis, Gould, Monogr. Trochil. iv. pl. 264.—Id. Intr. Trochil. 8vo, p. 141 (1861).—Salv. P. Z.S. 1870, p. 205.—Elliot, Synopsis of the Humming-Birds, p. 33 (1878).—Eudes-Deslongchamps, Ann. Mus. d’Hist. Nat. Caen, i. p. 243 (1880). Metallura castaneiventris, Reichenb. Aufz. der Colibr. p. 8 (1853).—Id. Handb. ‘Trochil. p- 5 (1855). Anthrocephala castaneiventris, Gould, Monogr. Trochil. iii. pl. 203.—Id. Intr. Trochil. 8vo, p. 115 (1861). Tuts species has already been figured in the Monograph—the male as O. leucaspis, the female as A. castaneiventris. Vt bas been thought better to take advantage of the opportunity of re-figuring it along with the other two species of the genus. Like O. cinereicauda, it bas a white throat, but may be easily distinguished from that species by its black tail. At present it is only known from Panama, where it has been found on the Volean de Chiriqui. In Costa Rica O. cinereicauda takes its place. [R. B. S.J