EXTERNAL ANATOMY OF INSECTS. 649 
in the Neuroptera numerous Libellulina emulate the 
Heliconian butterflies by their maculation; and in the 
genus Ascalaphus, which represents the Lepidoptera by 
its clubbed antennz*, many also have the resemblance 
increased by the painting of their wings, so that some 
entomologists have actually considered some cf them as 
belonging to that Order»; the wings of the Xylocope, 
before alluded to, sometimes add to the deep tints of the 
violet-—which also prevail in the wings of several Dr- 
ptera—towards their extremity the most brilliant me- 
tallic green or copper varying, 
“ As the site varies in the gazer’s hand,” 
and even those wings that consist of clear colourless 
membrane are often rendered extremely beautiful from 
the reflection of the prismatic colours. I should under- 
take an endless task did I attempt to specify all the modes 
of marking, clouding, and spotting, that variegate a 
wing, aifd all the shades of colour that paint it, amongst 
the Lepidopterous tribes; 1 shall therefore confine my- 
self to a few of the principal, especially those that di- 
stinguish particular tribes and families. Of whole co- 
loured wings—I know none that dazzle the eye of the 
beholder so much as the upper surface of those of Mor- 
pho Menelaus and Telemachus: Linné justly observes 
that there is scarcely any thing in nature that for bright- 
ness and splendour can be paralleled with this colour ; 
it is a kind of rich ultramarine that vies with the deepest 
and purest azure of the sky; and what must cause a 
striking contrast in flight, the prone surface of the wings 
is as dull and dark as the supine is brilliant, so that one 
* PLavE XXV. Fic. 30. » Scopoli, Hiibner. 
