388 EXTERNAL ANATOMY OF INSECTS. 



ii. Venter (the Belly). The lower or prone part of the 

 abdomen a . It includes the Hypochondria, Epiga- 

 strium b , Segmenta Ventralia, and Elastes. 



1. Hypochondria (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. Epigastrium (the Epigastrium). The first intire ven- 



tral segment d . 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 e . 



B Tympana (the Drums). Two deep cavities, contain- 

 ing a complex machinery on each side of the Epiga- 

 strhim in male Tettigonia?, which are the instruments 

 of sound f . 



3. Segmenta Ventralt a (the Ventral Segments). Trans- 



verse sections of the belly s . In Elytrophorous in- 

 sects they are usually of a firmer consistence than 

 those of the back. They include the Spiracula Ven- 

 tralia. 

 A Spiracula Ventralia (the Ventral Spiracles). — 



a Plate VIII. Fig. 6, 9, 15. B. 



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. 



c Plate VIII. Fig. 6. C. * Ibid. B' . e Ibid. B" . 



t Ibid. Fig. 18, 19. C" . 2 Ibid. Fig. 6, 9, 15. E. 



