Further Remarks on Fuligula nation

— MR. 1878.] P. L. SCLATER ON FULIGULA NATIONI. ; 477 a basi ad apicem clavi, vitta dilutiore centrali inter apicem clavi et margine antico pos...

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— MR.

1878.]

P. L.

SCLATER ON FULIGULA NATIONI.

;

477

a basi ad apicem clavi, vitta dilutiore centrali inter apicem clavi et

margine antico posita, et nebula ad marginem anticum apicem versus elytri late aurantiacis ; oculis, unguiculis et macula ad basin membranes nigrescentibus ; membrana pallide fusca, ad basin obscuriore, venis late pallide jlavescenti-albidis, maculas 5 marginales (4 apicales) et 2 centrales cingentibus ; femoribus tibiisque ad apicem jlavescentibus ; capite obtuse anguluriter rotundatoprominulo inter oculos, longiore supra quam ad marginem posticum inter oculos ; pronoto semicirculari, dimidio marginis postici aquilongo.

$ Long. 3 m. in. Hab. ineditioribusinsuhe, ad "Cason's," "High Peak," et "Diana's <3

.

Peak." Species venusta, in honorem Dominse Edith Wollaston, quae Lepidoptera et Coleoptera insulse Sanctae-Helenae diligentissime collegit, dicata.

EXPLANATION OF PLATE XXXI. Fig.

1.

Hapa

2.

Agrame'ra athiops,

3.

Vernonia wollastoniana, Salda aberrans, p. 470.

4.

3.

Fig. 5. Stonasla undulata, p. 472. 6. Nehela vulturina, p. 473.

contorta, p. 466. p. 468. p. 470.

7.

Argaterma

Further Remarks on Fuligula nationi.

alticola, p.

By

474.

P. L. Sclater.

[Keceived April 12, 1878.]

(Plate

XXXII.)

Professor Nation of Lima, Peru, has now forwarded to me a second specimen of the remarkable new Fuligula which Mr. Salvin Proceedings' last year (1877, p. and I described in the Society's This is a male, the former 522), and dedicated to its discoverer. example having been a female but, as will be seen on comparison, Prof. there is not a great difference in plumage between the sexes. Nation says that this bird is rare in the neighbourhood of Lima, but that he has lately ascertained that it is common in the north of Peru, and is found in great numbers on the lakes near the coast in certain months of the year. The species may now be diagnosed more correctly as follows '

;

:

Fuligula nationi.

(Plate

XXXII.)

Fusco-atra fere unicolor, in ventre brunnescentior, hypochondriis et genis in brunneum transeuntibus ; secundariorum parte basali, fasciam distinctam alarem constituente alba ; subalaribus nigris ; remigum pagina inferiore obscure cineracea ; rostro et pedibus nigris: long, tota 18"0, alee 8"5, caudce2'o, tarsi 1*45, dig.med. Femina omnino cum ungue 2'6, rostrl a rictu tin. dir. 22. brunnescentior, supra et in ventre tenuissime nigro vermiculata ,

capitis lateribus in brunnescenti-castaneum trahentibus sitie

minore.

Hab. Peruvia occidentals, prope Lima (Nation).

;

et

cras-

.

478

MR.

P. L.

SCLATER ON FULIGULA NATIONI. Fig. 2.

Fig. I.

Trachea of Fuligula nationi Fig. 1. Front view. Fig. 2. Dilatation at

its

cJ

lower end, seen from the

left side.

[May

7,

MR.

1878.]

SCLATER ON FULIGULA NATIONI.

P. L.

479

This species appears to be a true Fuliguline duck, the only known representative of the group in South America. In colour it is quite different from any other species of the genus known to me, being immediately recognizable by white bar on the wing.

its

black dress

and the transverse

The characteristic Fuliguline white spot between the rami of the mandible is small in the male but quite distinct, larger in the female. The white colour in the secondaries occupies rather more than the basal two thirds, but does not extend onto the outer elongated feathers ; it likewise pervades portions of both webs of some of the inmost primaries. The hinder toe has a well-developed lobe, almost as broad as in F. collaris. Prof. Nation has also sent to me the dried trachea of the male specimen, for the preparation of a figure and description of which I am indebted to Prof. Garrod. " In the trachea," Prof. Garrod remarks, " of this duck, as in the males of the sea-ducks generally, there is a large dilatation at the lower end, on the left side, composed of an osseous framework supporting membranous walls. The outer one of these is traversed by an intervening osseous bar (see fig. 2), which courses backwards and upwards from its anterior inferior angle, and sends two small extra bars to the supero-marginal rim, and so forms a pair of oval fontanelles, before it terminates at the superior and posterior angle of the outer wall. " The wall of the tracheal box which faces inwards is ossified through nearly its entire extent, a few small membrane-covered fontanelles being found not far from its superior margin. In this respect the species differs from Fuligula rufina, in which the wall under consideration is almost entirely membranous, whilst it is almost identical with F. marila. " The outer aspect of the terminal tracheal box is represented in fig. 2.

" Fig.

1 gives a front view of the trachea, which is seen to be considerably and fusiformly dilated in its middle part, in very much the same way as in Fuligula rufina, F. marila, Nyroca leucophthalma,

Clangula vulgaris, and Mergus serrator\ except that in the lastspecies the enlargement is situated somewhat nearer the

named

mouth. " In F. rufina the dilatation of the middle of the trachea is rather more considerable and more localized to the lower portion of the windpipe, whilst in F. marila it is more extended and not quite so considerable in breadth. In fact F. nationi is almost exactly intermediate between the two, tending, if at all, towards the latter species.

" In the South-American Metopiana peposaca the mid-tracheal dilatation is much more decided and more limited, forming a nearly 2 globose cavity like that in Melanitta fusca and Clangula histrionica." 1

2

Vide Eyton, See P. Z.

S.

Monograph of the Anatidre,' 1838, p. 63. 1868, p. 146, and 1875, p. 154. '

1878
English