ENTOMOLOGY. 107 



servable in particular parts, will be afterwards 

 iced as these orders pass successively under our 

 view. 



The mesothorax is not always readily recognised 

 its situation as intermediate between the prothorax 

 d metathorax, for, as above intimated, it frequently 

 pears in direct connection with the head ; but it 

 ay always be known by supporting the fore-wings 

 d middle pair of legs ; its anterior part is sometimes 

 ceived into a cavity of the prothorax, when the 

 tter is highly developed superiorly, at other times 

 e union between the two is by the edges. So 

 iimately is it soldered behind to the metathorax, 

 at there is frequently no visible suture, but in many 

 stances traces of the union can be detected. Ac- 

 rding to Burmeister, (whose nomenclature of the 

 irts in question appears to us preferable to that of 

 ost authors, on account of its greater uniformity and 

 nplicity,) this section consists of seven pieces, 

 it, as three pairs of these are so closely united that 

 ,ch pair seems to form only one piece, it may be 

 garded as composed of four principal parts; the 

 st of these, the mesonotum, (corresponding to the 

 >rsolum and scutellum of Kirby and Spence,) forms 

 e dorsal covering of the mesothorax. In many 



o * 



sects it is almost invariably concealed, but in 

 hers it is exposed and conspicuous ; in such cases 

 5 form is usually square, and there is a superficial 

 dication of its consisting of two parts ; the one of 

 ese, the true back, exactly corresponds to the 

 >rsolum of Kirby, the other is the scutellum, which 



