57 



XVI. Oft the Characters of the Class Insecta, 

 and of the Orders composing it. 



INSECTA. 



Character. 



Corpus 3-partiturn, e capite thorace abdomineque constans. 

 Caput a thorace distinctum, oculis 2 : AntemiisQ: mandi- 



bulls 2 : labio e maxillis exterioribus confluentibus ef- 



formato. 

 Thoi^aj: 6-pedatus, saspe alatus. 

 Abdomeji articulatum. 

 Trachea pro respiratione. 



The following arrangement of Insects into Orders I 

 proposed several years since, in the 9th volume of the Edin- 

 burgh Encyclopcedia, and have since republished it with 

 some alterations in the characters of the Orders, in the first 

 volume of the Supplement to the Encyclopiedia Britan- 

 nica. 



Suk'lassis I. Ametabox.ia. 



Insecta transformatione nulla. 



Of^dines. 



Abdomen setis terminatum. - - 1. Thysanura. 



Abdomen apice simplici. - - 2. Anoplura. 



VOL. III. 



