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No. 947. $ ad., Maruins, Rio Machados, 27. vi. 1908. “ Iris yellow, feet grey, 
bill black.”——Wing 54 ; tail 45; bill 14 mm. 
The type is an immature bird, while the specimen sent by Mr. Hoffmanns is 
perfectly adult. It differs from the former in having the upper parts duller and 
less rufescent brown; the upper tail-coverts brown like the back (instead of 
cinnamon-rufous) ; the tail duller, rufescent brown, less cinnamon; the edges to 
the remiges more olive-brown, less reddish; and the belly decidedly paler 
ochraceous. Moreover, the median and greater wing-coverts are deeper black, with 
the large apical spots better defined, as well as of a clearer ochraceous buff. These 
trifling differences are, no doubt, due to age. 
As pointed out by me (/.c.), M. leucophthalma is very nearly related to 
M. sororia Berl. & Stolzm.,* so closely indeed that the latter will have to be 
considered as only subspecifically distinct. The females of both forms agree in 
having the median and greater wing-coverts black with large rounded spots of 
ochraceous buff, while, in the allied M. gutturalis Scl. & Salv.,t from British 
Guiana and Cayenne, they are light rasset-brown with minute apical dots of buff. 
However, M. leucophthalma may be distinguished from M. sororia by the deeper 
colour of the under parts, deeper ochraceous buff apical spots to the wing-coverts, 
and by its rufescent brown or cinnamomeous (instead of dark brown) tail. 
An adult male from Bom Lugar, Rio Purts, + with the throat black spotted 
with white, differs in the same way—viz. decidedly rufescent brown tail—from a 
male of M. sororia (Mus. H. v. Berlepsch; Rio Tigré, N.E. Pera, J. Hauxwell 
coll.). Besides, the back is conspicuously lighter brown, the outer aspect of the 
wings less rufescent, and the cinereous of the breast paler. In both skins the apical 
spots to the wing-coverts are buff, whereas in the male of M. gutturalis the much 
smaller spots are pure white. The Purts bird undoubtedly represents the hitherto 
unknown male sex of M. leucophthalma. I have also examined the do ad. from 
Marajé mentioned by Miss Snethlage, noticing several small differences, which, 
however, must be confirmed by additional specimens before attempting any 
separation. 
I think it useful to append a condensed review which may help naturalists in 
the determination of these difficult birds. 
(a) M. leucophthalma leucophthalma (Pelz.). 
Type locality: Salto do Girao, Rio Madeira. 
Hab. Brazilian Amazonia: Macujubim, Island of Marajé (Hagmann—d in 
Mus. Paraense) ; Arumatheua, Tocantins (Snethlage); Rio Madeira: Salto do 
Girao (Natterer), Maruins, Rio Machados (Hoffmanns); Bom Lugar, Rio Parts 
(3 in Mus. Paraense). 
3 ad. Upper parts pale olive-brown, tail light rufescent brown ; lesser upper 
wing-coverts greyish olive, dusky at base; median and greater series black with 
large, rounded apical spots of deep buff; wings exteriorly edged with rufescent 
olive-brown. Throat black with large, wedge-shaped white spots; cheeks, malar 
region, foreneck, and breast pale cinereous ; lower abdomem, sides, and under tail- 
coverts pale olive-brown. 
* Tbis 1894. p. 396 (La Gloria, La Merced, Central Peru). 
+ Ibis 1881. p. 269 (Bartica Grove, British Guiana). 
¢ ©. gutturalis leucophthalma (sic!) Snethlage, Journ. f. Orn, 1908. p. 15. 
