OF INSECTS. 197 



From the free movements of the legs, and the 

 mmber of separate pieces entering into their compo- 

 sition, it may be presupposed that they have obtained 

 i large supply of muscular power. The coxae receive 

 he greatest number of muscles, especially if of a 

 globose form, and performing a rotatory movement 

 ipon their axis. Four extensors and a flexor, accord- 

 ng to M. Strauss, is the complement of the anterior 

 ,nd posterior coxse of the common cockchafer, and 

 hree flexors and two extensors of the middle coxse. 

 The muscles of the trochanter are inserted in the coxse, 

 md, like those of the latter, vary in number. In the 

 nsect just named there are three extensors and a 

 llexor for those of the anterior legs, and only a single 

 lexor and extensor for each of the others. The thigh 

 s moved by two muscles, and the tibia by a like 

 lumber, the tarsus by two general ones, and a pair 

 ippropriated to each separate articulation. The last 

 oint has two peculiar ones which act upon the claws. 



The muscular apparatus of the abdomen is much 

 nore simple than that of any of the other primary 

 livisions of the body. It consists chiefly of a series 

 rvhich serve to unite this part with the thorax, and 

 )f another designed to maintain the connection of the 

 lifferent segments with each other. They are in 

 general broad flat ribbons, rather thin and deprived 

 )f tendons. The organs of generation, owing to the 

 Complicated movements they perform, necessarily em- 

 ploy a great number of muscles, which assume as 

 jreat a variety of forms as the organs themselves, and 

 )f which, therefore, it would be unsatisfactory to at- 



