MR. P. L. SCLATER ON THE GENUS TYRANNUS. 



29 



1880.] 



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. alhigularis, from below. 



primary is not quite so sharply pointed, and is shorter. The bill is 



also smaller in T. alhigularis. 



As that most accurate observer Natterer designated this species 



by a MS. name in his Catalogue', I think there can be little doubt 



of the validity of T. alhigularis'. 



Tyrannus niveigularis, mihi (P. Z.S. 1860, p. 281), of which I 

 ■ See Pelzeln, Orn. Bras. p. 118. « Cf. Finsch, P. Z. S. 1870, p. 572. 



