Contributions to the theory of natural selection. A series of essays ... By Alfred Russel Wallace ...

A TtHEORY OF BIRDS' NETS, 241
diops of Ternate. In others the band is rufous in the
female, as in several of the American species; while
in Dacelo gaudichaudii, and others of the same genus,
the tail of the female is rufous, while that of the male
is blue. In most kingfishers the nest is in a deep
hole in the ground; in Tanysiptera it is said to be
in a hole in the nests of termites, or sometimes in
crevices under overhanging rocks.
2. Motmots (BMomotidoa). In these showy birds the
sexes are exactly alike, and the nest in a hole under
ground.
3. Puff-birds (Bucconidm). These birds are often
gaily coloured; some have coral-red bills; the sexes
are exactly alike, and the nest is in a hole in sloping ground.
4. Trogons (Trogonidm). In these magnificent birds
the females are generally less brightly coloured than the
males, but are yet often gay and conspicuous. The
nest is in a hole of a tree.
5. Hoopoes (Upupidm). The barred plumage and
long crests of these birds render them conspicuous. The
sexes are exactly alike, and the nest is in a hollow tree.
6. Hornbills (Bucerotidae). These large birds have
enormous coloured bills, which are generally quite as
well coloured and conspicuous in the females. Their
nests are always in hollow trees, where the female is
entirely concealed.
7. Barbets (Capitonidae). These birds are all very
gaily-coloured, and, what is remarkable, the most brilliant patches of colour are disposed about the head and
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