KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:o |7. 29 
A nest of the species, which I saw on my return to Perth in the Zoological 
Museum there, reminded me of this nest in every essential, and for this reason a 
photograph of it is more effective than any description (see fig. 12). 
The model of the outer wall was an imitation, as it seems, of the bark of the 
tree also because of the small white chips that are to be found interwoven in it. 
From the smaller, darker chips the structure gets an illusive resemblance to the bark. 
In this respect one may speak of mimicry in form, colour and structure. 
It may be added, that lighter nests of the same species are to be found in 
the museum, where a considerably greater quantity of white lichens have been put 
Fig. 14. Nest of Petreca campbelli, Fig. 15. Nest of Eopsaltria georgiana, 
Museum in Perth. Museum in Perth. 
on the walls of the nest. This one is situated in the fork of a light branch with 
yellowish spots (see also fig. 13). Whether the appearance of the nest changes in 
the same species according to the condition of the trunk it was of course impossible 
to ascertain from this scanty material, but it is very probable. 
Even the nest of Petreca campbelli (fig. 14) showed similar mimicry. 
Among nests which have got an outer structure, intended as an imitation of 
things in the neighbourhood so as to mislead the eye, there is no more wonderful 
example than the nest of FHopsaltria georgiana, a specimen occurring in South-West 
Australia. The nest, photographed in Perth museum, is situated in a cleft of a branch 
of a Banksia form (see fig. 15). The chips of bark, which have been fixed on, and 
