| → if we proceed 1869 1872 |
| travel a hundred miles, more or less, 1866 |
|
| → another mocking 1869 1872 |
| and a distinct mocker 1866 |
|
| → species belonging to the same two genera, 1872 |
| species belonging to the same genera, 1869 |
| OMIT 1866 |
|
| → butterfly belonging to 1869 1872 |
| species of 1866 |
|
| → destruction to a large extent, 1869 1872 |
| to a large extent, destruction, 1866 |
|
| → a large amount of evidence has now been collected, showing that they are distasteful to 1872 |
| Mr. Bates never saw them preyed on by 1866 1869 |
|
| → other insect-devouring animals. 1872 |
| certain large insects which attack other butterflies; 1866 |
| certain large insects which attack other butterflies. 1869 |
|
| ↑ 1 blocks not present in 1859 1860 1861 1872; present in 1866 1869 |
| He has good reason to believe
that this immunity is owing to a peculiar and offensive odour which
they emit.
|
|
| → in 1869 1872 |
| if not persecuted, in 1866 |
|
|
even in the shape of its wings, that Mr. Bates, with his eyes sharpened by collecting during eleven years, was, though always on his guard, continually deceived. When the mockers and the mocked are caught and
they are found to be
different in essential structure, and to belong not only to distinct genera, but often to distinct families.
this mimicry
in only one or two instances, it might have been passed over as a strange coincidence.
→if we proceed
from a district where one Leptalis imitates
Ithomia,
→another mocking
and
→species belonging to the same two genera,
equally close in their resemblance,
be found. Altogether no less than ten genera are enumerated, which include species that imitate other butterflies. The mockers and mocked always inhabit the same region; we never find an imitator living remote from the form which it
The mockers are almost invariably rare insects; the mocked in almost every case abound in swarms. In the same district in which a species of Leptalis closely imitates an Ithomia, there are sometimes other Lepidoptera mimicking the same
so that in the same place, species of three genera of butterflies and even
found all closely resembling a
→butterfly belonging to
a fourth genus. It deserves especial notice that many of the mimicking forms of the Leptalis, as well as of the mimicked forms, can be shown by a graduated series to be merely varieties of the same species; whilst others are undoubtedly distinct species. But why, it may be asked, are certain forms treated as the mimicked and others as the mimickers? Mr. Bates satisfactorily answers this question, by showing that the form which is imitated keeps the usual dress of the group to which it belongs, whilst the counterfeiters have changed their dress and do not resemble their nearest allies. |
|
| We are next led to inquire what reason can
be assigned for certain butterflies and moths so often assuming the dress of
and quite distinct
why, to the perplexity of naturalists, has nature
to the tricks of the stage? Mr. Bates has,
doubt, hit on the true explanation. The mocked forms, which always abound in numbers, must habitually
→destruction to a large extent,
otherwise they could not exist in such swarms; and
→a large amount of evidence has now been collected, showing that they are distasteful to
birds and
→other insect-devouring animals.
↑
The mocking forms, on the other hand,
inhabit the same district, are comparatively rare, and belong to rare groups; hence they must suffer habitually from some danger, for otherwise, from the number of eggs laid by all butterflies, they
→in
three or
|
