I90 THE INTEGUMENTAF. SKELETON OF THE IMAGO. 



C. Metathorax, Audouin. 



a. Metasternum. 



Transverse and Vertical Plate, Mihi. 

 Plastron, Chabrier. 

 Metafurca, lirauer. 



b. Dorsal Arch, Mihi. 



c. Metapleuron, Audouin. 



Epistemum and Epimeron, Audouin. 



d. Details of the Exo-skeleton of the Legs (J'latc IX.). 



(Ear a gcficral description of the ventral appendages of the thorax \legs\ set 

 p. 158.) 



The three pairs of legs differ chiefly in the form of the co.xse ; 

 the remaining joints are very similar in all. 



The Coxae of the anterior legs are tubular and prismatic 

 (Fig. I, ex) ; those of the intermediate pair, scaphoid, or boat- 

 shaped (Figs. 2 and 3) ; and of the posterior, pyramidal (Fig. 4). 



Each coxa is consolidated and protected by three sclerites ; 

 an anterior, a posterior, and an internal plate. 



In all the anterior plate is the largest and strongest. It 

 exhibits an internal longitudinal ridge, which terminates 



Bibliography :— 



82. Power, Henry, 'Experimental Philosophy,' in three books, con- 

 taining new experiments, microscopical, mercurial, magnetical, 4to. 

 London, 1644. 



83. HOOKE, • Micrographia.' London, 1667. 



84. LEEUWiiNHOEK, A., ' Anatomia rerum cum animatarum turn inanima- 

 tarum ope Microscopiorum.' Lugd. Bat., 1687. 



85. Leeuwenhoek, 'Select Works, containing his Microscopical Dis- 

 coveries ;' translated by Samuel Hoole, plates, 4to. London, 1798- 

 1807. 



86. Dereham, The Rev. W., ' Physico-Theology,' second edition, 1714. 

 An ingenious teleological disquisition, containing a note on the fly's 

 foot, p. 374, and many curious notes on insects. 



87. INMAN, Thos., ' On the Feet of Insects.' Proceedings of the Liverpool 

 Literary and Philosophical Soc, No. vi., p. 220. Liverpool, 1849. 



88. West, Tuifen, 'The Foot of the Fly; its Structure and Action 

 elucidated by Comparison with the Feet of Other Insects,' Part I., 

 with 3 plates. Trans. Linn. Soc, vol. xxiii. (1859), t86i. 



89. LowNE, B. T., 'On the so-called Suckers of Dytiscus, and the Pulvilli 

 of Insects.' Monthly Micros. Journ., vol. v., 1871. 



