1869.] MESSRS. SCLATER AND SALVIN ON THE ASTURINE. 131 
et Saly. Ibis, 1859, p. 217; Salvin, Ibis, 1861, p. 68; Scl. P. Z.S. 
1857, pp. 201 et 227, 1859, pp. 368 et 389, 1864, p.178; Lawr. 
A. N.Y. Lye. ix. p. 133. 
Asturina plagiata, Schl. Mus. d. P.-B. Asturine, p.1; Sel. et 
Salv. P. Z. S. 1868, p. 173. 
Supra schistacea fere unicolor: gula cinerea. Junior, tibus albi- 
cantibus fusco transfasciatis. 
Hab. Mexico, New Leon (Couch); Jalapa (Sal/é); Vera Cruz 
(Mus. Berol.) ; Guatemala (Salvin) ; Costa Rica (Arcé). 
This northern representative of A. nitida is easily distinguishable 
by the darker and uniform slaty plumage above in the adult bird. 
In A. nitida the feathers of the head and upper neck are white, 
with numerous narrow transverse bars of slaty grey. On the back 
and wings externally the ground-colour is ashy, but the darker 
transverse bars, though wider, are numerous and very conspicuous. 
In the present bird the transverse barring is wholly absent, leaving 
the upper surface nearly uniform, though traces of transverse mark- 
ings are apparent in some places beneath on raising the feathers, and 
are also faintly visible on the wing-coverts in some specimens. The 
lower of the two white tail-bands is narrower in the present bird 
than in A. nitida, but the upper appears to be usually more strongly 
shown in A. plagiata. 
The young plumage of the northern bird generally resembles that 
of the southern, but, as appears from the specimens we have met 
with, presents a constant difference in having the tibie distinctly 
marked by numerous cross bands. In the young of A. nitida the 
thighs are of a uniform ferruginous, more or less deep. 
The most southern locality we have yet met with for this species 
is Costa Rica, whence Arcé transmitted a single immature specimen 
in 1864. 
Dr. Peters having most kindly lent to us the type of Buteo pla- 
giatus, Licht., upon which Schlegel established his Asturina plagiata, 
we have been enabled to ascertain without doubt that it is the young 
of the present species. 
3. ASTURINA MAGNIROSTRIS. 
DL’ épervier a gros bec de Cayenne, Buff. Pl. Enl. 464. 
Falco magnirostris, Gm. 8. N. i. p. 282. 
Nisus magnirostris, Tsch. F. P. Aves, p. 104. 
Rupornis magnirostris, Cab. in Schomb. Guian. iii. p. 737. 
Asturina magnirostris, Sclater, P. Z. 8. 1857, p. 261, 1858, p. 451, 
1859, p. 147, 1860, p. 288; Scl. et Salv. P. Z. 8. 1866, p. 198, 
1867, pp. 589, 753. 
Astur macrorhynchus, Pelz. Orn. Bras. p. 6. 
Falco insectivorus, Spix, Av. Bras. i. p. 17, t. 8" (partim). 
Supra clare cinerea: subtus gula et pectore cinereis ; ventre toto 
cum tibiis albo et rufescente cinereo frequenter transfasciatis. 
Hab. Cayenne (Buffon) ; Brit. Guiana (Schomb.); Rio Negro, 
Rio Brancho, and Rio Madeira (Natterer); Venezuela (Goering) ; 
