120 INTERNAL ANATOMY OF INSECTS. 
siphonets also above it*. A semi-fluid excrement is: pro- 
duced by some species of Chermes, as that which inhabits 
the Box, which often comes from the animal in long con- 
voluted strings resembling vermicelli. Reaumur says its 
taste is agreeable, much more so than that of manna’, 
Under this head should be included the abundant spume 
with which the larva of Cercopis spumaria envelopes it- 
self¢. 
2 De Geer iii. 26. » Reaum. iii. 357. ¢. xxix. f. 6-—10. 
© Vor. II. p. 228, 
