BEAVIS PP RDAs 20 
decidedly (about 3 mm.) shorter; the first primary falls between the sixth and seventh. In the 
adult male, the fourth remex is attenuated at the apex and slightly bent outwards. The tail is 
rounded and slightly emarginate, the median rectrix being a little shorter than the following 
ones. Tarsus short, strong as in Scofothorus, and distinctly scutellate. The outer toe united 
to the middle toe for its basal half. Under tail coverts remarkably long, covering more than 
two-thirds of the length of the tail. 
I have not been able to ascertain whether there is any sexual difference in the species 
of this genus. Adult o’o" with the apex of the fourth primary attenuated have the top of the 
head and nape black, the remaining upper parts uniform light green; lower surface pale 
yellow with broad black lunulations on the chest, under tail coverts and sides of the body, the 
lower throat sparingly spotted with black. 
Specimens with the fourth primary of normal shape are more densely lunulated or 
banded with black underneath, and the upper wing coverts show large, cinnamon-rufous 
apical spots, I suppose these to be young birds, but am not sure of this. The upper mandible is 
always blackish, the lower one whitish. 
The plumage of the nestling of L. buckleyi is most remarkable. It is described by 
Sclater & Salvin (Proc. Zool. Soc. Lond. 1880, p. 158), as follows : the upper surface, including 
the whole of the head, is of a cinnamon colour spotted with black, each black spot on the head 
being tipped with white ; the under surface is black, banded with narrow white bars. From the 
top of the head proceed fine black filaments more than 25 mm. long, each tipped with white. 
Geographical Distribution. Wood region of Southeastern Brazil (Rio de Janeiro and 
S. Paulo) and Eastern Ecuador. Two species are known, one of which is somewhat doubtful. 
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1. Laniisoma squamatum (Wied). (Plate 1, Fig. 10.) 
Muscicapa squamata Wied, Beitr, Naturg. Brasil, Vol. 3, Abt. 2, p. 814 (1831) (S. E. Brazil). 
Lanius arcuatus Lafresnaye, Mag. Zool. 1833, Cl. 2, pl. 12 («du Bresil, rapporté par M. Lalande »). 
Ptilochloris lunatus (err. typ.) Swainson, Classif. Birds, Vol. 2, p. 250 (1837). 
Hab. Wood region of Southeast Brazil (Rio de Janeiro, S. Paulo). 
N. B. Piilochloris remigialis Lafresnaye, Rev Zool. 1838, p. 237 (locality unknown) 
I have not seen. It seems to be of the same coloration as the g adult of L. squamatum, described above. but 
is said to be much smaller. 
2. Laniisoma buckleyi (Sclater & Salvin). 
Ptilochloris buckleyi Sclater and Salvin, Proc. Zool. Soc. Lond. 1880, p. 158, pl. 16 (Pindo, Eastern Ecuador). 
Hab. Eastern Ecuador. 
20. GENUS HETEROCERCUS ScLATER 
Heterocercus Sclater, Cat. Amer. Birds, 1862, p. 245 (type : Elaema linteata, Strickland). 
Characters. The members of this genus are at once recognizable by the peculiar shape 
of the tail. The bill, not unlike that of Neopelma, but much larger, is rather broad at the base 
