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Show 572 DR. O. FINSCH 0\ THB BIRDS OF TRINIDAD. [JuilC 23, Long. al. 4" 3'" 4 0 4 3 4 51 4 5" 4 2 4 6 OS o" 2 3 3 3 3 3 iud. 11'" 9 0 2 1 0 2 rostr. 13'" 13 121 13 IH 14" 14 lat. ad bas. 7'" 6} >- / 7 7 7 7i tars. !).V" 9 9 9 9 9 9 dig. med. 7'" (Trinidad.) - (Trinidad.) 6h (Demerara) 7 (Costa Rica.) - (Brazil.) , 61 (Brazil.) - (Brazil, Ceara.) 51. TYRANNUS MELANCHOLICUS, Vieill. Laphyctes melancholicus et L. satrapa, Cab. M . II. ii. pp. 76, 77. Tyrannus melancholicus et T. satrapa, Scl. Cat. p. 235. Tyrannus melancholicus, Taylor, I. c. p. 87. Tyrannus verticalis, Leot. (nee Say) p. 213. A younger specimen, without red patch on the crown; the first primaries not attenuated at the apex. There is no difference whatever between specimens from Venezuela (Angostura) and the Argentine republic (Mendoza) ; the separation into two representative species for the north and south has therefore no real value. In contradiction to the views of Dr. Cabanis, I agree with Von Pelzeln in considering T. albigularis, Burm. (Bras.ii. p. 465), to be specifically different from T. melancholicus. A specimen from Brazil in the Bremen Museum shows the chin and throat decidedly white ; whereas these parts in T. melancholicus are whitish grey. Four specimens from Northern Brazil (Ceara) all show this latter character. lat. rostr. Jor 4" 4 4 4 3 4 ig. al. 1'" 3 5 3 9 2 rectr. ext. 3" 5'" 3 5 3 5 3 4 3 2 3 5 rect. med. 2" 9'" 2 9 2 9 3 0 - 2 11 rostr. H'" 9 9 9 H 8± ad bas. frin 5 5 H 5 4k tai 81 8 8 8 III (melancholicus, Trinidad.) (melancholicus, Venezuela.) (melancholicus, Mendoza.) ( 3, albigularis, Brazil, Ceara.) ( 2 , albigularis, Brazil, Ceara.) (albigularis, Brazil.) 52. MILVULUS TYRANNUS (L.); Leot. p. 217. 3Iilvidus tyrannus et violentus, Scl. Cat. p. 237. One specimen not quite in full plumage, and the yellow feathers on the crown just developing. The northern and southern forms of this species do not merit a specific separation ; at least I cannot find any character which proves to be constant. According to Dr. Cabanis, the Brazilian M. violentus may be distinguished in having a darker-coloured back ; but in one specimen from Rio Grande do Sul, on the contrary, I find the back lighter, whereas in another specimen from the same locality the back is as dark as in a specimen from Trinidad, which agrees in every respect with two others from Bolivia. A younger specimen from Demerara has the upper parts washed with brown. 31ilvulus monachus, Haiti., is based upon a young specimen, as described by Von Pelzeln (Orn. Bras. ii. p. 118, Anmerk. 2). This |