Genus — E OPSALTRIA. 
Eopsaltria Swainson, Fauna Boreal. Amer., p. 492, 
“ 1831 ” = Feb. 1832. Type (by original 
designation) ... Motacilla australis White. 
Also spelt — 
Eu'psaltria “ Aliq.” Gray, Handl. Gen. Sp. Birds B.M., Yol. I., p. 389, 1869. 
This genus was separated by Swainson, the author of Pachycephala, and has 
been commonly used since. The structural differences are so slight that I 
united these two in 1912, especially as the female of some species of Pachy - 
cephala closely resemble in coloration the species of Eopsaltria. However, 
there is a facies which enables the recognition of the skins, while the living 
birds are even more distinct. Especially noticeable is the peculiar aspect 
of the head, which suggests that cranial skeletal features may be distinguished, 
while the nestling coloration indicates divergence at an early stage and 
possibly no very close relationship. 
Superficially the present genus has a longer, thinner bill with a more 
distinctly keeled culmen ; the tip is decurved and hooked, and the mandible 
is more flattened. The rictal bristles are short. The wing is long and rounded, 
the first primary small, less than half the length of the second, which is notice- 
ably less than the third ; the fourth, fifth and sixth are longest, the fourth 
slightly exceeding the others while the sixth is longer than the third ; the 
seventh is longer, but the eighth is shorter, than the second. 
The tail is comparatively long and square, while the legs are small and 
weak. 
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