70 NORTH AMERICAN INSECTS. 
with that manna of which the Israelites did eat in the wil- 
derness. This supposition, however, is probably incorrect, 
because the substance of which we speak is very cathartic, 
and is used as such even at the present day. But Ehren- 
berg discovered another species on Mount Sinai, produced 
upon the Tamarisk-tree by the stings of a Plant-louse (Coc- 
cus manniparus), which tastes like honey, and which may 
possibly be identical with that mentioned in the Bible. 
The Red-eyed Cicada (Cicada Septemdecim, Fig. 17), with 
Figure 18. 

The Lyerman. 
red-bordered wings, and the Lyerman (Cicada tibicen, Fig. 
18), with green-bordered wings, are the most conspicuous 
species of North America. But the natural history of all 
the different species is the same. All have an inflected 
snout, very short setaceous antennz, four membranaceous 
wings, and six feet. The females have a long, horny ovi- 
positor, and only the males possess the singing organ, which 
is an extended movable membrane on the under side of 
the abdomen, by the rapid vibration of which they produce 
their peculiarly loud and shrill sound. The females are all 
dumb. Virgil says: 
‘¢__raucis 
Sole sub ardenti resonant arbusta Cicadis.” 
Or, in English rhyme: 
‘“While the scorching sun beats down upon the plain, 
The bushes echo with.the hoarse Cicada’s strain.” 
