10 TYRANNIDA. 
Hab. Panama, Calovevora 8, Santa Fé? (Arcé), San Pablo Station (O. S8.), Lion 
Hill 4561011 (M‘ZLeannan).—Sovutn America from Colombia * to Guiana, Ama- 
zons valley! and Brazil } 2. 
Spix described this species from specimens obtained near Rio Janeiro and in the 
Amazons valley, and examples from these localities agree with one another and with 
our series from the State of Panama. Mr. Lawrence separated the Panama bird under 
the name of R&. flavo-olivaceus*®, but a specimen, in our collection, compared with his 
type appears to us to be inseparable from the true R. sulphurescens, though Mr. Sclater 
places &. flavo-olivaceus as a synonym of R. cinereiceps ®. 
kthynchocyclus marginatus +! is another name, apparently applicable to this species, 
but the type has a slightly greyer head and darker back, the edgings of the wings are a 
little more distinct, and it is also a trifle greyer on the throat. Mr. Sclater places this 
name without question amongst the synonyms of R. sulphurescens®. We do not think 
the trifling differences alluded to justify its separation. 
As will be seen above, R. sulphurescens has a very wide range over Tropical America, 
being probably restricted to the hot low-lying districts. 
4. Rhynchocyclus cinereiceps. 
Cyclorhynchus cinereiceps, Scl. Ibis, 1859, p. 443; P. Z. S. 1859, p. 884°; Scl. & Salv. Ibis, 1860, 
p- 399°. 
Rhynchocyclus cinereiceps, Scl. & Salv. P. Z.S. 1864, p. 359‘, 1870, p. 837° ; Lawr. Ann. Lye. 
N. Y. ix. pp. 146°, 201"; Bull. U. S. Nat. Mus. no. 4, p. 26°; Nutting, Pr. U.S. Nat. 
Mus. v. p. 395°; Nutting & Ridgw. Pr. U.S. Nat. Mus. vi. pp. 874, 884"; Sel. Cat. Birds 
Brit. Mus. xiv. p. 169”. 
Rhynchocyclus sulphurescens, Lawr. Ann. Lyc. N. Y. ix. p. 112”. 
Precedenti similis, sed capite undique cinereo, gutture toto quoque cinereo, alarum marginibus minus distinctis 
et abdomine pallidiore, distinguendus. Iride (ave viva) alba. 
Hab. Mexico, Oaxaca? and Playa Vicente? (Boucard), Teapa (H. H. Smith), Tapana, 
Sta Efigenia (Swmichrast *), Merida in Yucatan (Schott™), Peto in Yucatan, Izalam 
(G. £. Gaumer); British Honpuras, Orange Walk (G. F. Gaumer); Guatemaa, 
Chisec, Choctum, Cahabon (0. 8S. & FP. D. G.), Volcan de Agua above San Diego, 
Escuintla ? (0. 8.); Honpvras, San Pedro (@. Whitely®); Nicaracua, San Juan 
del Sur" and Sucuya ™ (Wutting); Costa Rica, La Palma (Nutting), Angostura 
(Carmiol ° 18); Panama, Lion Hill (1/‘Leannan *). 
On comparing a series of specimens recently sent us from Teapa, in the Mexican 
State of Tabasco, by Mr. Herbert Smith, with our examples from Panama, we find no 
differences, and considering how closely allied the species is to R. sulphurescens, its 
characters are exceedingly constant. 
A good deal of confusion has arisen respecting the references to this species and 
fi. sulphurescens in Costa Rica and the State of Panama, but we believe we have here 
