LEUCOPTERNIS.—BUSARELLUS. 85 
_ LL. semiplumbea was originally described from the Isthmus of Panama, and we have 
since received two examples from Veraguas. It is, however, apparently more plentiful 
in Costa Rica, as the U.S. National Museum possesses nine specimens from that 
country, collected by Carmiol and Professor Gabb®. Mr. Townsend also met with the 
species on the Segovia River in Honduras *, and we have two examples in our 
collection, procured at Remedios in the province of Antioquia, in Colombia, by Salmon. 
These latter appear to be an adult male and female, but as they have two white bands 
across the tail, and one of Arcé’s skins from Veraguas also shows this character, we 
imagine that they are less mature than others in our series; should this be the case, 
there is but little difference in plumage between the young and old birds. The 
Colombian specimens, however, have the wings rather more distinctly barred, the head 
and mantle more streaked with white, and the blackish streaks on the throat more 
distinct. 
Salmon records that the iris is yellow and that the food consists of insects. 
BUSARELLUS. 
Busarellus, Lafresnaye, in d’Orb. Dict. d’Hist. Nat. ii. p. 785 (1842) ; Sharpe, Cat. Birds Brit. 
Mus. i. p. 210; Ridgway, Bull. U. S. Geol. Surv. i. p. 142. 
This genus has a very different plumage from that of the ordinary Buzzards, and it 
is, moreover, remarkable for having spicules on the soles of the feet, like those of the 
Ospreys and Fishing-Owls of the genera Keéupa and Scotopelia. Like these, the single 
species of Busarellus seems to be piscivorous. Mr. Ridgway remarks that it ‘‘ exhibits 
a striking analogy to Pandion in the very strong and slightly graduated claws, the close 
feathering of the tibie, the general form of the bill, and the sharp spicules of the 
toe-pads. It differs very markedly from Pandion, however, in the deep grooving of 
the claws, the soft texture of the plumage, the Buteonine scutellation of the tarsi and 
toes, and indeed in all essential features.” 
1. Busarellus nigricollis. 
Black-necked Falcon, Lath. Gen. Syn., Suppl. i. p. 30°. 
Falco nigricollis, Lath. Ind. Orn. i. p. 35°. 
Buteo nigricollis, Vieill. N. Dict. d’Hist. N. iv. p. 473°; Lawr. Mem. Bost. Soc. N. H. i. p. 302 *. 
Buteogallus nigricollis, Scl. & Salv. Ibis, 1859, p. 216°; Cass. Pr. Ac. Phil. 1860, p. 182°; Sel. 
P, Z. S. 1860, p. 2537. 
Busarellus nigricollis, Sharpe, Cat. Birds Brit. Mus. 1. p. 211 *; Ridgw. Bull. U. S. Geol. 
Surv. ii. p. 142°; Sumichrast, La Nat. v. p. 286"; Nutting, Pr. U.S. Nat. Mus. v. 
p. 404"; vi. p. 395”; Zeledon, An. Mus. Nac. Costa Riva, 1887, p. 126”; Richmond, 
Pr. U. S. Nat. Mus. xvi. p. 522"; Sharpe, Hand-l. Birds, i. p. 258°; Salvad. Boll. Mus. 
Torino, xiv. no. 339, p. 10”. 
Supra castaneus, plumis omnibus stria rhachidali nigra notatis, capite toto lactescenti-albo, pileo postico et 
