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Show 1880.] MR. P. L. SCLATER ON THE GENUS TYRANNUS. 29 more deeply forked than in T. melancholicus. The primaries are acuminated, much as in T. melancholicus (see fig. 2 ) ; but the sixth Tail-end of T. albigularis, from above. Fig. 2. Wing-end of T. albigularis, from below. primary is not quite so sharply pointed, and is shorter. The bill is also smaller in T. albigularis. As that most accurate observer Natterer designated this species by a M S . name in his Catalogue1, I think there can be little doubt of the validity of T. albigularis". Tyrannus niveigularis, mihi (P. Z. S. 1860, p. 281), of which I » See Pelzeln, Orn. Bras. p. 118. 2 Cf. Finsch, P. Z. S. 1870, p. 572. |