47i> 
LESSONIA. — LESTRIS. 
Margarethae Heine, Journ. Ornith. 1863. XI. 213. p= Trockilus cyanurus 
Steph. 
mocoa Rekiienbach, Enumer. Trochil. 5. — Trockilus mocoa Delattre. 
nuna Gould, Monogr. Trochil. III. Tb. 169. — Trockilus nuna. 
Ortoni Lawrence, Ann. Lyc. New York IX. 260. — Eespubl. aequat. 
phaon Bonaparte, Revue Mag. Zool. 1854. VI. 252. = Trockilus phaon. 
sparganura Bonaparte, Revue Mag. Zool. 1854. VI. 252. = Trockilus spar- 
ganurus Steph. 
Sylphia Mulsant, Mém. Soc. Cherbourg 1866. XII. 227. = Trockilus Gouldi 
Lodd. 
Victoriae Reichenbach, Enumer. Trochil. 5. = Trockilus amaryllis Bourc. 
LESSONIA (Tyrannidae. — Lesson) Swainson, Faun. bor. amer. 1831. 490. — 
Gray, Genera Birds 1847. I. 201. = Fluvicola Swains. 
Synon.: Centrites, Centrophanes Cab. — Auchmalea Reichb. 
Bill moderate, rather slender, straight and pointed, with the culmen straight 
to the emarginated tip; the lateral margins and gonys slightly ascending; the nostrils 
lateral, placed in a groove, with the opening anterior, oval, and partly clothed 
with the frontal plumes. Wings long and pointed, with the first and second 
quills equal and as long as the fifth; the third rather longer than the last and 
as well as the second, pointed at the end; the fourth the longest. Tail moderate, 
broad and slightly emarginated. Tarsi longer than the middle toe, slender and 
covered by an almost undivided scale in front. Toes rather short, with the outer 
toe rather longer than the inner, and slightly united at the base; the hind toe 
moderate and armed with a very long, rather curved and acute claw, 
erythronotus Swainson, Fauna bor. amer. II. 490. = Fluvicola nigra. 
nigra Gray, Genera Birds I. 201. — Fluvicola nigra. 
orcas Gray, Handl. Birds I. 347. = Fluvicola nigra. 
LESTRIS (Laridae. — AY]<JTpi£ praedatrix). — Illiger, Prodr, Syst. Mam. Av. 
1811. 272. 
Synon.: Buphagus Möhr. — Stercoarius Briss. — Catharracta Brünn. — Labbus 
Rafin. — Oceanus Koch. — Praedatrix Vieill. — Catarracta Leach. — Coprotheres Reichb. 
— Megalestris Bonap. 
Rostrum mediocre, crassiusculum , feretiusculum , maxillae parte culminali, para- 
tonis et dertro distinctis, dertro convexo uncinato, mandibulae myxa gnathidiis dimi- 
dio breviore, angulo mentali prominulo. Nares mediae, sub parte culminali antica 
sitae, immarginatae. Alae elongatae. Caudae rectrices duae intermediae elongatae. 
Pedes aequilibres, médiocres, palmati, tetradactyli , kalluce libero, digiti medii 
tertiam partem aequante, insistente, simplici, unguiculato. Digiti laterales lomate 
externo angusto aucti, medius externo, externus interno longior. Ungues falculares. 
Tarsus digitum medium aequans. — 5 Specc. 
antarctica Lesson, Traité Ornith. 616. — Sclater, Proc. Zool. Soc. 1860. 
390. [Nov. Holl. Ins. Norfolk. 
Lestris catarractes Quoy et Gaimard, Voy. Uranie Ois. Tb. 38. 
Catarracta catarractes Boie, Oken's Isis 1844. 197. 
Stercorarius antarcticus Gray, Genera Birds III. 653. 
Catarractes antarctica Bonaparte, Compt. rend. 1856. XLII. 770. 
Megalestris antarctica Gould, Proc. Zool. Soc. 1859. 98. 
Lestris fuscus Ellman, Zoologist 1861. 7472. 
Stercorarius catarractes Schlegel, Mus. Pays-Bas Lari 46. 
brachyrhynchus Brehm, Vögel Deutschi. 723. = Lestris cepkus Blas. 
Brissoni Boie, Oken's Isis 1822. 562. == Lestris cepkus Blas. 
catarractes Temminck, Man. Ornith. 511. — Gould, Birds Australia VII. 
Tb. 21. — Naumann, Natg. Vögel Deutschlds. X. 470. Tf. 270. 
[Terrae arctic ae. 
Larus catarractes Latham, Ind. Ornith. II. 318. — Linne, Syst. Nat. I. 
226. 
Larus fuscus Brisson, Ornith. VI. 165. 
