Genus— ALIS TER ORN IS. 
Alisterornis Mathews, Austral Av. Rec., > 
Vol. I., pt. 5, p. Ill, Dec. 24, 1912. 
Type (by original designation) Pachycephala lanioides Gould. 
Though structurally this genus “ Differs from Pachycephala in its larger bill 
and in having the first and second primary longer than in that genus ” it 
is more anomalous than is suggested by that diagnosis. 
It was the recognition by Tom Carter that the female of this species was 
so like a Colluricincla that he at first mistook the former for a member of 
that genus that suggested the relationship of these two groups which Gould, 
from field knowledge, placed together, but which the specialists at the British 
Museum widely divorced, placing them in separate families. I am now investi- 
gating this matter and will give my conclusions when I deal with the species 
of Colluricincla. 
It may be suggested that this is a mangrove -dwelling derivative directly 
from the ancestral type while the mangrove -living species of Pachycephala 
have taken to that habitat since the Pachycephala s. str. coloration was 
produced. 
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