EXTERNAL ANATOMY OF INSECTS. 387 
il. VENTER (the Belly). The lower or prone part of the 
abdomen?. It includes the Hypochondria, Epiga- 
strium», Segmenta Ventralia, and Elastes. 
1. Hypocnonpria (the Hypochondria). Two portions 
of segments, one on each side; which in some ge- 
nera © (Carabus L., &c.) intervene between the first 
intire ventral segment and the posterior part of the 
Postpectus. 
2. Eprcastrium (the Epigastrium). The first intire ven- 
tral segment *. It includes the Mucro and Tym- 
pana. 
A. Mucro (the Mucro). The central posterior point of 
the Epigastrium observable in many of the Orders, 
which reposes between the posterior legs; and, ac- 
cording to M. Chabrier, is useful to the insect du- 
ring flight ¢. 
B. Tympana (the Drums). Two deep cavities, contain- 
ing a complex machinery on each side of the Epiga- 
strium in male Cicade, which are the instruments 
of sound f. 
3. SEGMENTA VENTRALIA (the Ventral Segments). Trans- 
verse sections of the belly &. In Elytrophorous in- 
sects they are usually of a firmer consistence than. 
those of the back. They include the Spivacula Ven- 
tralia. 
A. Sprracuta VenrraLia (the Ventral Spiracles).— 
a Prate VIII. Fic. 6, 9, 15. B. 
» The scientific reader must recollect that these terms are em- 
ployed, not because these parts are thought to be true representa- 
tives of the Epigastrium and Hypochondria of vertebrate animals, 
but merely on account of some analogy between them. 
© Prate VINT. Fie, 6. C’. 4 Tbid. D!. © Thid. BY, 
Ibid. Fic. 18, 19. C". © Thid.. Fre. 6, 9, 15; 2". 
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