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Show 566 DR. O. FINSCH ON THE BIRDS OF TRINIDAD. [June 23, States, Peru (Chamicuros), and South Brazil (St. Catharina), convinces m e that I am right in uniting Vireo agilis with V, olivaceus; for I am not able to find out a single constant character to distinguish them. Von Pelzeln already remarked (Orn. Bras. ii. p. 73, note 1) the only difference might be that V. olivaceus has the first primary equal to the fourth, whilst in V. agilis the first is equal to the fifth ; but in m y experience these differences are not constant and cannot be considered of specific value. In one North- American specimen the first quill is equal to the sixth, in the other to the fifth, as in a Trinidad one; in the other specimen from Trinidad the first quill is shorter than the fifth, in a Brazilian one a little longer, and in a Peruvian specimen of an intermediate length between the fourth and fifth. All the specimens have full-grown quills. With respect to the coloration, there is not difference sufficient to distinguish more than one species. The Trinidad skins agree in every respect with those from North America, as well as with the Brazilian specimen ; the latter, collected by Mr. Burmeister, jun., is in general somewhat darker ; the Peruvian one is duller above, the under tail-coverts are much paler, showing only a faint tiuge of yellow; but, as we learn from Mr. Cassin (B. N. A m . p. 332), this is only an individual difference, for in North-American specimens the under tail-coverts "are sometimes almost entirely white." The size varies much. As noticed by Professor Reinhardt, this little bird has been procured once in Greenland. Greenland and the southern portion of Brazil inhabited by one and the same species is a striking instance of the very extended distribution of many birds, at which I should feel much astonished if I had not met with numerous examples of the same kind in African ornithology. Fam. FORMICARIIDCE. THAMNOPHILIN^E. 42. CYCLORHIS FLAVIPECTUS, Scl. P. Z. S. 1858, p. 448, Cat. p. 45; Leot. p. 263; Taylor, I. c. p. 81. ? Cyclorhis subflavescens, Cab. J. f. Orn. 1860, p. 405. Three specimens. This species is closely allied to C. wiedi, Pelz. (Orn. Bras. iii. p. 137; T. guianensis, Neuw. ; C. viridis, Burm., nee Cab.), from Brazil; but the head above is more decidedly grey, the rufous frontal and superciliary stripe broader and darker, and the legs are not lead-coloured, but light fleshy yellowish, this latter being the chief character. Two old specimens have the head grey, only at the occiput washed with a dull brown; a third one has the whole upper surface of the head tinged with reddish olive, and the white on the abdomen also washed with a very faint tint of isabelline colour. This one, being in moult, is undoubtedly a young bird, and agrees very well with |