THE THORAX. 89 



pterum, a part unknown to me ; the ties or ilialiques, our scapula, and 

 the sternum moyen, our mesosternum. His metathorax consists of the 

 clipeus, our metanotum ; the clamcule posterienre, a part which I also 

 could not find, and which I consider to be either a mere process of the 

 metanotum, or one of the joint pieces at the root of the wing ; the two 

 ischion, our pleura and parapleura ; and lastly, the sternum posterieure, 

 our metasternum. He also takes notice of the corneous rings of the 

 spiracles, as parts of the thorax, and which are seated in the articu- 

 latory membrane of it : he calls them cadres. 



The description is good and praiseworthy? like all the works of the 

 skilful Straus ; but the French names which he adopts must give place 

 to the partially older Greek ones. 



In a comparative view of the number of the thoracic pieces named 

 by different authors, we find that Knoch has twelve, Kirby and 

 Spence, twenty, Chabrier and myself, eighteen, Audouin, thirty-six, 

 of which Macleay makes fifty-two, by the separation of each dorsal 

 plate into four pieces ; and Straus-Durckheim, twenty-two, because, 

 besides the eighteen described ones, he adopts a clamcule to both the 

 meso- and meta-notum. 



The annexed table gives a precise comparative view of the nomen- 

 clature of the several writers. 



