ENTOMOLOGY. 109 



1 1 of two divisions, which may be distinguished as 

 ! e anterior and posterior wings of the scapulae.* 

 I The spiracle of the mesothoracic segment, which 

 lid heen long overlooked, owing to its latent posi- 

 lon, is found beneath and a little beyond the poste- 

 I or wings. The patagia and tegulce of the Lepidop- 

 |;ra and Hymenoptera, (which we shall afterwards 

 I .hide to, when considering these orders) are attached, 

 he latter to the mesonotum, the former to the poste- 

 or wing of the scapula. 



The mesosternum forms the under side of the 

 lesothoracic case, being directly opposite to the 

 icsonotum. It is in all cases distinct, and some- 

 imes comprehends a considerable area, in which the 

 ockets of the middle legs are included. 



The only primary segment of the thorax remaining 

 I be considered, is the Metathorax which, like that 

 ast described, supports a pair of legs and a pair of 

 vings. It does not attain a high degree of develop- 

 nent in any of the orders, except among the Coleop- 

 era and Orthoptera ; its structure, consequently, can 

 )e most satisfactorily investigated in these. It may 

 ikewise be regarded, according to the authority we 

 .iave chiefly followed in describing the constituent 

 Darts of the thorax, as consisting of seven pieces, 

 which bear considerable resemblance to those of the 

 mesothorax. The dorsal portion is the metanotum, 

 commonly quadrangular, with the front emarginate 

 and the anterior angles consequently advanced. The 



* Burmeister's Manual, p. 81. 



