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feature so conspicuously marked as in the members of. the succeeding genus Chalybura; there it is carried to its
maximum, and is rendered so much the more apparent from the striking contrast of the snow-white-plumed under
tail-coverts with the dark or black colouring of the tail-feathers. These birds form a very natural section of the
Trochilide. Venezuela, New Granada, and Panama may be regarded as their head quarters,—two of the species,
C. Buffon and C. ceruleogaster, being frequently sent in collections from Bogota.

Although the sexes of this genus of birds are very differently coloured, the females have the plumed under tail-

coverts as well as the males.

Genus Cuarysura, Reichenb.

102. CuatysBura Burront.
Hypuroptila Buffoni : : : : ,
Chalybura Buffom, Reichenb. Aufz. der Col. p. 10; Cab. et Hein. Mus. Hein. Theil iii. p. 20.
Agyriria Buffoni, Reichenb. Troch. Enum. p. 7, pl. 766. figs. 4773-74.

Habitat. Venezuela and New Granada.

Vol. II. Pl. 89.

103. CHALYBURA UROCHRysIA, Gould.
Hypuroptila urochrysia, Gould : : : ; ‘ ; : ‘ ‘ i y Vol. IT. Pl. 90.
Habitat. Panama.

104, CHALYBURA CHRULEOGASTRA, Gould.
Hypuroptila ceruleogaster, Gould. 4 4 : : ; : : : : ; Vor Rieot.

Cyanochloris coerulewentris, Reichenb. Aufz. der Col. p. 10.

Agyrtria coeruleientris, Reichenb. Troch. Enum. p. 7, pl. 77. figs. 4775-76.
Chalybura caeruleiventris, Cab. et Hein. Mus. Hein. Theil iii. p. 20.
Habitat. New Granada.

105. CHatyBurA? Isaur#, Gould.

Hypuroptila Isaure, Gould in Proc. of Zool. Soc. part xxix. p. 198.

Habitat. The Bocca del Toro in Costa Rica.

Head, all the upper surface, wing-coverts, flanks, and abdomen coppery bronze, inclining to purple on the
lower part of the back and upper tail-coverts; wings purplish-brown ; tail very dark bronze, inclining to purple ;
throat and breast grass-green; under tail-coverts white; upper mandible black; under mandible fleshy, with a
black tip ; tarsi yellow or flesh-colour.

Total length 43 inches ; bill 12;; wing 23; tail 12; tarsi 4.

The specimen from which the above description was taken is somewhat immature ; it is, however, sufficiently
advanced to show that it would have, when adult, a fine green breast ; but whether the green colour would extend
over the abdomen, I am unable to say. It is nearly equal in size to the C. urochrysia, C. Buffoni, and C. ceruleigastra ;
but it has a shorter wing and a more rounded tail than either of those species, and the under tail-coverts, though
white, are less plume-like in form. It is just possible that it may be necessary to separate this bird into a new
genus when we see it in its fully adult state; but it appears at present to be most nearly allied to the members of
the genus in which I have provisionally placed it. I received this bird from M. Edouard Verreaux, of Paris, many
years ago, and I have never seen another.

The name of Jsaur@ was suggested to me by my late highly valued friend the Prince Charles Lucien Bonaparte,
who wished thus to convey a compliment to Madame la Baronne de Lafresnaye, the niece of Montbeillard, the able

coadjutor of the celebrated Buffon.

Genus IoLama, Gould.
Cov, viola, et, Aapos, guia.)
Generic characters.
Male.— Bill considerably longer than the head and slightly arched ; wings long and curved ; primaries rigid, of
moderate length, and forked; tarsi clothed; feet rather small; hind toe shorter than the middle toe; nails short and
curved.

This genus was proposed for the Trochilus Schreibersii of Loddiges ; and: of this form Mr. G. N. Lawrence, of

Q