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ENERO DUCT GON cll

Hemithylaca Edwardi, Cab. et Hein. Mus. Hein. Theil iii. p. 37, note.

Habitat. Panama, Costa Rica, and Veragua.

I have specimens of this bird killed by Mr. Bridges near David, at an elevation of from 8000 to 10,000 feet,
according to the label attached.

355. ERYTHRONOTA NIVEIVENTRIS, Gould. : ; . : ; : 2 : : Vol Verlag:

Chlorestes niveiventris, Reichenb. Troch. Enum. p. 4, pl. 700. figs. 4566-67.
Hemithylaca nivewentris, Cab. et Hein Mus. Hein. Theil iii. p. 37.

Habitat. Panama and Veragua.

356. ERYTHRONOTA ELEGANS, Gould. : : ‘ i : : i : ; : Vol. V. PI. 320:
Habitat. Unknown.
This is a very elegant species, and quite distinct from every other known Humming-Bird. In its glittering
light-green crown, throat, and chest it looks like a Chlorostilbon; but the form of its tail and some other characters

ally it to the Erythronote, with which I have provisionally placed it.

The next natural section is that of Saucerottia, of which I am acquainted with three species distinguished from
the Erythronote by their larger size, stouter bills, and by their more uniform dark-green colouring. All are

confined to a comparatively limited area—namely, Costa Rica, Veragua, Panama, and the northern parts of New

Granada.

Genus Saucerortia, Bonap.

357. SAUCEROTTIA TyPICA, Bonap.
Erythronota Saucerottei : : : i ‘ : : ; : ‘ ‘ : Vol Vv. Pl 32l.
Habitat. New Granada.

358. SAUCEROTTIA SOPHL.
Erythronota Sophie ‘ i : 4 j : : : : ¢ : ; : Wolk Ve El 322:
Habitat. Costa Rica, Veragua, and New Granada.

359. SauceRoTTIA WARSZEWICZI.

Hemithylaca Warszewiczt, Cab. et Hein. Mus. Hein. Theil iii. p. 38.

Habitat. Banks of the River Magdalena.

As the S. Sophie differs from the S. typica in the richer blue colouring of its upper and under tail-coverts and
tail, so does this species differ from the S. Sophie in having the tail and its coverts both above and beneath of a
still richer and more violet blue. It is also of smaller size ; and the green of its under surface is different from
that of both, being purer and deeper. The examples in my collection were obtained by M. Warszewicz on the
banks of the Magdalena.

The bird to which M. Bourcier has given the specific name of cyanifrons requires separation from the last three
species, as much or more than they do from their predecessors the Erythronote. M. Cabanis’s generic name of
Hemithylaca having been applied to this group as a whole, subsequently to those of Saucerottia and Erythronota, I
must either place his name in the rank of a synonym or adopt it for the present species, the only one of this

particular form.

Genus Hemrruyiaca, Cad.

360. HeMITHYLACA CYANIFRONS.
Saucerottia cyanifrons . : : : : : : : i ‘ ; : : Vol. V. PI. 323.
Hemithylaca cyanifrons, Cab. et Hein. Mus. Hein. Theil iii. p. 39.
Habitat. New Granada.

Somewhat allied to the genera Hemithylaca and Erythronota is the isolated form constituting my genus
Eupherusa. ‘The single species known is a native of Central America. Contrary to what occurs among the
Erythronote, the sexes differ very considerably in their plumage—a fact of which I was not aware when my plate

of the species was executed.