84 * FALCONIDE. 
Of this magnificent species very little is known. In 1865 a collection arrived from 
Arcé from Costa Rica, containing a specimen which was described by Dr. Sclater *. 
Since that time we have met with but one example, procured by Endres, and now 
in our collection. The U.S. National Museum possesses a third, obtained from 
Van Patten. 
L. princeps is one of the rarest of the Birds of Prey, and nothing is known 
respecting its habits or economy. 
3. Leucopternis plumbea. 
Leucopternis plumbea, Salvin, Ibis, 1872, p. 240, t.8*; Sharpe, Hand-l. Birds, i. p. 258 *. 
Urubitinga plumbea, Sharpe, Cat. Birds Brit. Mus. i. p. 216°; Ridgw. Bull. U. S. Geol. Surv. ii. 
p. 172%. 
Plumbea, alis et cauda nigricantibus, hac fascia mediana alba, illis subtus albis ; remigibus ad apicem leviter 
fasciatis; tibiis albido leviter sed crebre fasciatis; rostro nigro, cera, mandibule basi et pedibus 
flavis. Long. tota circa 14:0, alee 9:0, caude 5:5, tarsi 2‘7. (Descr. exempl. ex Veraguas, Panama. 
Mus. nostr.) 
Hab. Panama?, Veraguas (Arcé).—Ecvuapor !. 
L. plumbea, which shows in its sombre style of coloration a resemblance to a 
Urubitinga, was originally described by us from a specimen sent to Mr. Higgins from 
Ecuador, probably from one of the valleys of the Andes in the vicinity of Quito. We 
afterwards received an example from Sarayacu, from Buckley. The British Museum 
has another from Panama, and Arcé sent us a fourth from Veraguas. Nothing is 
known of its habits. 
4. Leucopternis semiplumbea. 
Leucopternis semiplumbea, Lawr. Ann. Lyc. N. Y. vii. p. 2887; ix. p. 183°; Scl. & Salv. Ex. Orn. 
p- 121, t. 61°; v. Frantz. J. f. Orn. 1869, p. 368°; Salv. Ibis, 1872, p. 243°; Ridgw. Bull. 
U.S. Geol. Surv. ii. p. 178°; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 126"; Ridgw. 
Pr. U. S. Nat. Mus. x. p. 592°; Sharpe, Hand-l. Birds, i. p. 259°; Salvad. Boll. Mus. 
Torino, xiv. no. 339, p. 10°. 
Urubitinga semiplumbea, Sharpe, Cat. Birds Brit. Mus. i. p. 220”. 
Supra schistacea unicolor, plumis ad basin albis: subtus alba, striis paucis rhachidalibus ad pectus nigris ; 
alis subtus albis, remigibus ad apicem plumbeo-griseo leviter fasciatis ; cauda nigricante, fascia mediana 
alba, subtus fascia ad basin notata; rostro nigro, cera aurantiaca, mandibule basi et pedibus aurantiaco- 
flavis, iride flava. Long. tota circa 13:5, ale 7-3, caudz 5:2, tarsi 25. (Descr. exempl. ex Veraguas, 
Panama. Mus. nostr.) 
Juv. Fuscescentior, subtus cervino vix tincta, remigibus subtus ad apicem magis distincte fasciatis; cauda 
fasciis duabus albis brunnescente tinctis transvittata. 
Hab. Honpuras, Segovia R. (Townsend *); Costa Rica (v. Frantzius*), Valza (Carmiol), 
Talamanca (Zeledon’, Gabb°); Panama (M‘Leannan'), Veraguas (Arcé), Forests 
near the Laguna de Pita, Punta de Sabana (Festa !°),—CoLomBIa. 
