SIRYSTES.—MYIODYNASTES. AT 
1. Sirystes albogriseus, (Tab. XXXVII. fig. 1.) 
Lipangus albogriseus, Lawr. Ann. Lyc. N. Y. viii. p. 9%. 
Sirystes albogriseus, Scl. & Salv. P. Z. S. 1880, p. 1567; Scl. Cat. Birds Brit. Mus. xiv. p. 182°. 
Supra cinereus ; uropygio albo; capite summo nigro; loris fuliginosis; alis nigris, secundariis et tectricibus 
late albo marginatis ; cauda nigra, stricte albo terminata: subtus albus; gutture et hypochondriis cinereo 
tinctis: rostro corneo, mandibula ad basin albicante; pedibus nigricantibus. Long. tota 7°3, ale 4-1, 
caudee 3:5, tarsi 0°8, rostri a rictu 0-9. (Descr. exempl. ex Panama. Mus. nostr.) 
Hab. Panama, Veraguas (Arcé?), Lion Hill (M*Leannan?). 
Very little is known of this species, the first specimen of which was sent by 
M‘Leannan to Mr. Lawrence, who described it under the name of Lipangus albo- 
griseus!. We have since received two specimens from the State of Panama, but we 
are not informed of the exact spot where they were obtained. The species most nearly 
allied to the one under consideration is S. albocinereus of the valley of the Upper 
Amazons. This differs in having the wing-coverts much more narrowly edged with 
greyish white. 
MYIODYNASTES. 
Myiodynastes, Bonaparte, Compt. Rend. xxxviil. p. 657; Notes Orn. p. 87 (1856); Scl. Cat. Birds 
Brit. Mus. xiv. p. 182 (type Muscicapa cudax, Gm.). 
Hypermitres, Cabanis, J. f. Orn. 1861, p. 247 (type Scaphorhynchus chrysocephalus, Tsch.). 
This genus is divisible into two well-marked sections—one characterized by the breast 
and flanks being conspicuously marked by black guttate spots, in the other the under 
surface is uniformly coloured. 
In our region we find two of the former section, viz. VM. luteiventris and M. audax, 
nearly universally distributed, and one of the second, M. hemichrysus, restricted to Costa 
Rica and the adjacent parts of the State of Panama. 
Of the first section we find it impossible to recognize more than three species, though 
this view differs from that of several authorities on the subject. Thus Mr. Ridgway in 
his ‘Manual of North-American Birds’ (p. 332), omitting all mention of WM. solitarius, 
recognizes two species, M. luteiventris and M. audaxr; but divides the latter into three 
races, VM. audax proper, M. a. nobilis, and M. a. insolens. We, so far as the number 
of species are concerned, confirm Mr. Ridgway’s views, but we fail to discriminate his 
subspecies of IM. audax. Mr. Sclater in his recent revision of the Tyrannide divides this 
section of the genus into four species, namely VM. luteiventris, M. nobilis, M. audaz,, 
and WM. solitarius. We now merge WM. nobilis and MW. audax under the latter name, 
and somewhat alter the range defined of all the species, except M. solitarius. 
The question of distribution of these Myiodynastes is very singular, for with few 
exceptions wherever MW. luteiventris is found M. audax occurs with it, and moreover 
M. solitarius overlaps the range of MM. audax in many places. In spite of this con- 
current range each form keeps its characters with great precision. 
