LEUCOPTEENIS. — BU8AEELLTJS. 85 



L. semiplumbea was originally described from the Isthmus of Panama, and we have 

 $incj8 received two examples from Veraguas. It is, however, apparently more plentiful 

 in Costa Eica, 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 Remedies 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 Arce'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. Diet. d'Hist. Nat. ii. p. 785 (1842) ; Sharps, Cat. Birds Brit. 

 Mus. i. p. 210; Ridgway, Bull. U. S. Geol. Surv. ii. 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 Ketupa 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 tibiae, 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. Diet. d'Hist. N. iv. p. 473 '; Lawr. Mem. Bost. See. N. H. ii. p. 302 *. 



Buteogallus nigncollis, Sel. & Salv. Ibis, 1859, p. 216 = ; Cass. Pr. Ac. Phil. I860, p. 132'; Sol. 



P. Z. S. 1860, p. 253 \ 

 Busarellus nigricollis, Sharpe, Cat. Birds Brit. Mus. i. p. 211 ' ; Ridgw. Bull. U. S. Geol. 



Surv. ii. p. 142'; Sumichrast, La Nat. v. p. 236"; Nutting, Pr. U. S. Nat. Mus. v. 



p. 404''; vi. p. 395"; Zeledon, An. Mus. Nac. Costa Rica, 1887, p. 126"; Richmond, 



Pr. U. S. Nat. Mus. xvi. p. 522"; Sharpe, Hand-1. 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 



