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LEUCOPTERNIS S EM IP LUM B EU S .
LEUCOPTERNIS SEMIPLU5IBEA.
(SEltlPLUlIBEOTÍS BUZZARD).
Leucopternis semiplumheus . ■ ■ Lawr. An n . Lye. N . T . vii, p. 288.
S u p rà plumbea, alis c au dâque n ig ric a n tib u s : b u ju s fasciis d uabus a ngustia , a lte ra in feriore perfecta, a ltera
superiore imperfecta, cum to to co rpore su b tù s a lb is : ro s tro n ig ro , b a si e t c e ra cum p ed ib u s a u ra u tia c is ; ung u ib u s
n ig ris : long, to ta 14-0, alæ 8 0, caudæ 5 0, ro s tri a r ic tu l ' I , ta rs i 2'2.
H a b . in Is tbm o P a n am en si {McL ea n n a n ) : rep . Co sta-Eieen si (Carmiol).
In 1801 Mr. George N. Lawrence described this distmct o f Buzzard from a single
specimen obtained by Mr. J. MeLeannan on the Panama railway-line. The bird, liowever,
remained quite unknown to us imtil a short time since, when we had the gratification of
recognizing a single individual in a Costa-Rican collection received from Mi-. J . Carmiol. This
skin, from which our figure (reduced to two-thirds o f the natural dimensions) has heen prepared,
is now in the collection o f NIessrs. Salvm and Godman. It was procured at Valza in Costa
Rica in February o f the present year. It is marked as a female, but appears to be rather
smaller in dimensions than the specimen described by Mr. Lawrence.
In form Leucopt&rnis semiplumhea appears to bo a typical species o f this genus, but is
easily recognizable by its small size, and by the uniform plumbeous colour o f the whole upper
surface. There arc some slight indications o f narrow shaft-stripes on the neck, but the plumage
below is othei-wise o f a pure white. The under-wing-coverts and gi-eater part o f the remigcs
below are of tho same spotless colom-, but the apical portions o f the latter are slaty with darker
mai-gins aud cross-bands. The fifth primary is rather longer than the fourth, and longest—tho
first being shorter than the secondaries and measuring 5‘8 in. from the carpal joint.
The known species o f LeucopUmis are eight in number. We have now seen specimens of
all o f them, and propose to arrange them as follows :—
A—Corp o re su b tu s omninò albo,
a . c ap ite to to albo.
1. L. GniESliEEOnTI.
Bu teo gUesbregliU, D u B u s, Esq. O ru . t. 1 : Sel. & Salv. Ib is , 1859, p. 217 : Scl, P.Z.S . 1857, p. 227 : S.alv, P.Z.S.
1867, p. 158 : Lawr. Au u . Lyc. N . T . vii., p. 288 : Cab. J . f, O m . 1853, p. 8 8 . Asturina ghieshreghti, Sebi, Mus.
des P . B. Asturinm, p . 11.
Hab. America c en tralis a Mexico merid. ad. istbm. Panameuaem.