SCALE-WINGED INSECTS. 287 
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Fig. 221.—The Berenice. 
we divide into two groups, the Crepuscularia ( Crepus- 
cula, twilight), Twilight-fliers, or Hawk Moths, and the 
Nocturna, or True Moths. Linneus called the Hawk 
Moths Sphinxes, from the peculiar attitude, resembling 
the sculptured Sphinx, so often assumed by the cater- 
pillars of these Moths. Most of the species in this genus 
are Twilight-fliers, but not all; for some fly about in 
bright sunlight, sucking the nectar of flowers with their 
long trunks. These species are more brilliantly colored 
than the common species, which have a dull brownish- 
gray aspect, like the owls, whose habits are similar. The 
larvee of the Hawk Moths, on going into the pupa state, 
either inclose themselves in cocoons, or bury themselves 
in the ground. The perfect insects make a loud hum- 
ming sound in their flight. The Humming-bird Moth is 
one of the most beautiful of the diurnal species, and is 
remarkable for the loudness of the humming sound which 
it makes while feeding poised on its wings. 
489. The Nocturna, or True Moths, are by far the most 
extensive group of the order. They are much like most 
of the Sphinxes, but their antennz are very different, be- 
ing broad at the base, and tapering to a point at the end. 
The Cecropia, Fig. 186, is one of the most splendid of 
these Moths. The Silkworm Moth belongs to this group; 
so do all that variety of Moths, or Millers, that fly about 
