2f>4 



PTILOTA : IMAGO EXTERNAL ANATOMY. 



Entomology," wherein, although Messrs. Kirby and Spence 

 do not describe much more than twenty of its distinct com- 

 ponent parts, about forty different words are used for them 

 in the nomenclature of the thorax. The chapter on Oris- 

 mology is nevertheless, as Mr. MacLeay observes in the 

 Zoological Journal, " more particularly valuable, and, making 

 allowance for the nomenclature of parts, deserves the special 

 attention of entomological students." 



Much of this confusion has been obviated by M. Audouin, 

 who, from his admirable comparative investigation of the 

 structure of the segments of the body, ascertained that they 

 were respectively composed of the same essential parts, and 

 consequently that the same series of names might be applied 

 to each. The following is a table of the thorax, as theo- 

 retically supposed by him to exist in all insects. 



