56 TYRANNIDZ. 
which are divisible into several groups, most of which are represented by the five 
species found within our boundaries. 
Of the typical form we have two species, M. sulphureipygius, which occurs through- 
out Central America, and U/. barbatus, the prevalent southern bird, which enters our 
fauna as far north as Costa Rica. These have wings without cross bands, dark tails, 
and a sulphur rump. The males, too, are crested. The little W. fulvigularis has no 
crest, the rump is coloured like the back, and the tail cinnamon: this is a bird of wide 
range, represented in Guiana by I. erythrurus; it reaches Costa Rica in our fauna. 
M. nevius not only occurs in the State of Panama, but has a wide range in South America 
as far south as Buenos Ayres: the breast of this species is more or less streaked, and 
the head crested. Lastly, we have I. capitalis, a rather abnormal bird of Costa Rica 
and Nicaragua, about which we know very little. It has been transferred to Mitre- 
phanes by Mr. Ridgway, but is certainly more out of place there than in Myiodius. 
The rictal bristles are not so fully developed as in the typical birds. 
M. sulphuretpygius has a wide bill, the width at the rictus being about half the 
length of the tomia. The nasal fossa is extended forwards, and the nostrils are large 
and open at the end; the rictal bristles extend beyond the end of the bill; the tarsi and 
feet are rather feeble; the wings are much rounded, the 4th quill longest, 3rd = 5th, 
2nd = 6th, Ist much < the rest; tail slightly emarginate, = $ wing, >8 tarsus. 
1. Myiobius barbatus. 
Muscicapa barbata, Gm. Syst. Nat. i. p. 9337. 
Myiobius barbatus, Lawr. Ann. Lyc. N. Y. vii. p. 828°; Salv. Ibis, 1885, p. 295°; Scl. Cat. Birds 
Brit. Mus. xiv. p. 199%. 
Myiobius atricaudus, Lawr. Ibis, 1868, p. 183°; Ann. Lyc. N. Y. viii. p. 8°; Scl. & Salv. P.Z. 8S. 
1864, p. 360°; Salv. P.Z.S. 1870, p. 198°; Nutting, Pr. U. S. Nat. Mus. v. p. 396°. 
Supra obscure olivaceus ; crista verticali flava celata; uropygio sulphureo; tectricibus caude superioribus et 
cauda ipsa nigris; alis nigricantibus, dorsi colore extrorsum limbatis: subtus pallide flavus; pectore et 
hypochondriis fulvo lavatis; subcaudalibus fuscis: rostri maxilla fusca, mandibula pallida ; pedibus 
obscure corylinis. Long. tota 4:6, ale 2-4, caudee 2°3, tarsi 0-7, rostri a rictu 0°55. (Descr. exempl. ex 
Panama. Mus. nostr.) 
Q mari similis, sed cristam flavam caret. 
Hab. Costa Rica, La Palma (Nutting ®) ; Panama, Calovevora (Arcé§), Lion Hill 
(1 Leannan ? > °7),—Cotomsra‘ and Ecuapor‘ to AMAZONS VALLEY 4, Gurana ! 3, and 
Braziu 4, 
The country of the typical M. darbatus is Guiana, and on comparing specimens from 
there and the State of Panama we find no material difference. On an average the 
tails of birds from the latter country are rather blacker than those from Guiana, but 
the difference is quite insignificant. 
La Palma, in Western Costa Rica, seems to be the extreme limit of the range of 
this species within our country. Here Mr. Nutting met with it, but it is probably 
