THE THORACIC EXO-SKELETON. 189 



A very complete history of the opinions held on Latreillc's 

 ' segment mediaire ' is given by Gosch [79] . 



The remaining sclerites of the thoracic skeleton are those of 

 the legs, wings, and tympanic apparatus, to each of which I 

 shall devote a separate section. 



Nomenclature and synonymy of the thoracic skeleton : 

 A. Prothorax, Audouin. Collare, Chabrier, etc. Manitruncus, Kirby 

 and Spence. Corselet, Straus Durckheim. 



a. Prosternum, Burmeister. Prosternal area, Mihi. Contains the 



following sclerites : 

 Sella, Mihi. Cephalo-thorax, Mihi, olim. 

 Pectorals, Mihi. 

 Clavlculae, Mihi. 

 Manubrium, Mihi. 



b. Neck-sclerites, jugulares, are : 



Condyles, Mihi. 3">^- jugulaire, Kunckel d'Herculais. 

 Epicondyles, Mihi. 2'"<= jugulaire, Kunckel d'Herculais. 



c. Prodorsum, or prodorsal arch, Mihi. 



d. Epitrochlea, Mihi. 



e. Paratreme, Mihi. Scapula, Burmeister; olim, Humerus. 



f. Internal parts : 



Prophragma, Mihi. Post-scutellum, Audouin. 

 Hypotremata, Mihi. Belong also to mesothorax. 



V>. Mesothorax, Audouin. Consists of : 



a. Sternum. Meso-sternum, Audouin. 



Plastron, Chabrier. 

 Entothorax, Audouin. 

 Furca and median plate, Mihi. 

 Lateral plates, Mihi. 

 Great Entopleuron, Mihi. 



b. Dorsal region : 



Prescutum, Audouin. 

 Scutum, ibid., which bears the 



Great Alar Apophysis, Mihi. Processus Styloideus, Chabncr. 

 Scutellum and Post-scutellum, Audouin. 

 Supra-tympanic iissure, Mihi. 

 Mesophragma, Brauer. Costa, Chabrier. 

 Lateral Plate of Post-scutellum, Mihi. 

 c. Lateral region : 



Pleuron, Audouin. 



Parapteron, Audouin. Clavicle, Kiinckel d'Herculais. 



Episternum and Epimeron, Audouin. 



Costa, Straus Durckheim. 



Tympanic Bulla, Mihi. 



Dolium, Mihi. The tympanic bulla; and post-scutellum. 



