lyo THE INTEGUMENTAL SKELETON OE THE IMAGO. 



C. Metathorax, Audouin. 



a. Metastemum. 



Transverse and Vertical Plate, ^Tihi. 

 Plastron, Chabrier. 

 Metafurca, Brauer. 



b. Dorsal Arch, Mihi. 



c. Metapleuron, Audouin. 



Episternum and Epimeron, Audouin. 



d. Details of the Exo-skeleton of the Legs (Plaic IX.). 



(Eor a i^rnc!-(il description of tJie 7'ciiiral appcndas^es of t/ie thorax \_h\^s] see 



p. 158.) 



The three pairs of legs differ chiefly in the form of the coxae ; 

 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. Leeuwenhoek, 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, jjlates, 4to. London. 1798- 

 1807. 



86. Dereham, The Rev. W., ' Physico-Theology,' second edition, 17 14. 

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

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



•/ 87. In.m.\n, Thos., 'On the Feet of Insects.' Proceedings of the Liverpool 

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



\ 88. West, Tuffen, '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), 1861. 



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

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



