Darwinism (1889): An exposition of the theory of natural selection, with some of its applicationsWallace, Alfred Russel
Science
Darwinism (1889): An exposition of the theory of natural selection, with some of its applications
Wallace, Alfred Russel
Evolution; Natural selection
Wasps and bees are often closely imitated by insects of other orders.
Many longicorn beetles in the tropics exactly mimic wasps, bees, or
ants. In Borneo a large black wasp, whose wings have a broad white patch
near the apex (Mygnimia aviculus), is closely imitated by a heteromerous
beetle (Coloborhombus fasciatipennis), which, contrary to the general
habit of beetles, keeps its wings expanded in order to show the white
patch on their apex, the wing-coverts being reduced to small oval
scales, as shown in the figure. This is a most remarkable instance of
mimicry, because the beetle has had to acquire so many characters which
are unknown among its allies (except in another species from Java)--the
expanded wings, the white band on them, and the oval scale-like
elytra.[109] Another remarkable case has been noted by Mr. Neville
Goodman, in Egypt, where a common hornet (Vespa orientalis) is exactly
imitated in colour, size, shape, attitude when at rest, and mode of
flight, by a beetle of the genus Laphria.[110]
The tiger-beetles (Cicindelidae) are also the subjects of mimicry by
more harmless insects. In the Malay Islands I found a heteromerous
beetle which exactly resembled a Therates, both being found running on
the trunks of trees. A longicorn (Collyrodes Lacordairei) mimics
Collyris, another genus of the same family; while in the Philippine
Islands there is a cricket (Condylodeira tricondyloides), which so
closely resembles a tiger-beetle of the genus Tricondyla that the
experienced entomologist, Professor Westwood, at first placed it in his
cabinet among those beetles.
[Illustration: FIG. 26.--Mygnimia aviculus (Wasp). Coloborhombus
fasciatipennis (Beetle).]
[Illustration: FIG. 27.
a. Doliops sp. (Longicorn)
mimics Pachyrhynchus orbifae, (b) (a hard curculio).
c. Doliops curculionoides mimics (d) Pachyrhynchus sp.
e. Scepastus pachyrhynchoides (a grasshopper),
mimics (f) Apocyrtus sp. (a hard curculio).
g. Doliops sp. mimics (h) Pachyrhynchus sp.
i. Phoraspis (grasshopper) mimics (k) a Coccinella.
All the above are from the Philippines. The exact correspondence of the
colours of the insects themselves renders the mimicry much more complete
in nature than it appears in the above figures.]
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