108 FALCONID. 
Sparvius semitorquatus, Vieill. N. Dict. d’Hist. N. x. p. 322 *, 
Micrastur semitorquatus, Strickl., Scl. & Salv. Ibis, 1859, p. 218‘; Salv. P. Z. S. 1870, p. 216°; 
Cat. Strickl. Coll. p. 497°; Lawr. Ann. Lye. N. Y. ix. p. 1347; Mem. Bost. Soc. N. H. u1. 
p. 299°; Bull. U.S. Nat. Mus. no. 4, p. 40°; v. Frantz. J. f. Orn. 1869, p. 369° ; Sharpe, 
Cat. Birds Brit. Mus. i. p. 751; Boucard, P. Z. S. 1878, p. 44 2. Sumichrast, La Nat. v. 
p- 285°; Salvad. & Festa, Boll. Mus. Torino, xiv. no. 839, p. 10™. 
Climacocercus semitorquatus, Cab. J. £. Orn. 1865, p. 407”. 
Sparvius melanoleucus, Vieill. N. Dict. d’Hist. N. x. p. 327 a 
Micrastur melanoleucus, Ridgw, Pr. Ac. Phil. 1875, p. 482°7; Nutting, Pr. U.S. Nat. Mus. vi. 
p. 877°; Boucard, P. Z. S. 1883, p. 457"; Richm. Pr. U. S. Nat. Mus. xviii. p. 628”; 
Bangs, Pr. N. Engl. Zool. Club, ii. p. 15”. 
Falco percontator, Cabot, Journ. Bost. Soc. N. H. iv. p. 462”. 
Supra niger, supracaudalibus albo anguste terminatis et latius transfasciatis ; remigibus nigricantibus, obscure 
brunneo, intus albo fasciatis ; cauda nigra, albo terminata et fasciis albis 4-fasciata ; pileo nigro; torque 
collari albo ; genis et regione parotica albis, griseo adumbratis, hac fascia circulari nigra circumcincta ; 
corpore subtus albo, rhachidibus nigris vix evidentibus; subalaribus albis, nigro maculatis ; axillaribus 
albis, striis rhachidalibus nigris: rostro nigro; cera, loris et orbitis nudis olivascenti-viridibus ; pedibus 
flavis; iride pallide brunnea. Long. tota circa 22°0, ale 10°8, caude 10-4, culm, Il, tarsi 3°35. 
(Descr. maris ex Colima. Mus. nostr.) 
Juv. ab adulto valde dissimilis. Nigricanti-brunneus, torque collari ochraceo interrupto; alis caudaque 
brunneis, ut in adulto fasciatis ; genis et facie laterali et corpore subtus toto pallide ochrascenti-fulvis, 
fasciis latis cordiformibus vel transversis regulariter vittatis. Long. tota circa 23:5, ale 10:5. (Descr. 
exempl. ex Medio Monte, Guatemala. Mus, nostr.) 
Hab. Mexico, both coasts (Sumichrast 8), Mazatlan (Grayson *), Presidio de Mazatlan 
(Forrer), Sierra Madre de Colima (Xantus1"), Plains of Colima, Tehuantepec 
(Richardson), Mirador (Sartorius ''), Tehuantepec city 917, Santa Efigenia?®, 
Tonala (Sumichrast), Altamira, Tampico (Armstrong *°), Yucatan (Cabot 7°, 
Gaumer 1°); GUATEMALA (Constancia ®, Skinner *), Retalhuleu, Medio Monte, 
Savana Grande (0. 8S. & F. D. G.); Satvapor, La Libertad (Richardson) ; 
Nicaracua, San Juan del Sur (Nutting 18); Costa Rica (v. Frantzius 1°), San José, 
Angostura (Carmiol 1"), Las Cruces de Candelaria, Rancho Redondo (v. Frantzius *", 
Zeledon’), Candelaria Mts. (Boucard *), Talamanca, Lipurio (Gabb 1"), Sibahue, 
Irazu, Bebedero (Underwood); Panama, Mina de Chorcha (#. Arcé°), Lion Hill 
(M‘Leannan™, Brown?}), Laguna de Pita (Festa *4).—Sovurn America generally 
to Paraguay 131}. 
We agree with Mr. Ridgway '’ that melanoleucus is a more correct name for this 
Hawk than that of semitorquatus, both having been published in the same work **°. 
It is the largest member of the genus Micrastur, and is further distinguished from the 
smaller forms, such as Mf. gueril/a and its allies, by the uniformly coloured under 
surface. MM. melanoleucus is found throughout the greater part of the forest country 
of the Neotropical region, from Mexico to Brazil and Paraguay. Although most of 
our specimens come from the western provinces, Sumichrast !° states that it inhabits 
the “tierra caliente ” of both coasts of Mexico. Mr. Armstrong, moreover, met with 
