Microscopical Essays, 705 



cafe, which in the figure is totally removed, as it contained 

 nothing remarkably different from that of other infects with two 

 wings. The guards or feelers, a a, are of a fpungy or flelhy 

 , fubftance, and are grey, covered with {hort hairs ; they are united 

 to the head by a little joint of the fame texture, which in this 

 view of the object could not be {hewn. Thefe guards are a de- 

 fence to the other parts of the apparatus, as they are laid upon 

 it fide by fide whenever the animal flings, and by that means pre- 

 ferve it from external injury. The two lancets, b b and B, evi- 

 dently open the wound, and are of a delicate and tender ftru&ure, 

 formed like the differing knife of the anatomift, with a {harp 

 point and {lender edge, but gradually increafing to the back. 

 The two ftiaped inftruments, c c and C, appear as if intended to 

 enlarge the wound, by irritating the parts round it ; to accom- 

 plilh which, they are jagged, or toothed ; they may alfo 

 ferve, from their hard and horny texture, to defend the tube 

 e E, which is of a fofter nature, and tubular, to admit the blood, 

 and convey it to the ftomach ; this delicate part is inclofed in a 

 cafe, d D, which entirely covers it. Thefe parts are drawn 

 feparately at B, C, D, E. De Geer obferves, that it is only the 

 females that fuck the blood of animals ; and Reaumur declares, 

 that having made one difgorge itfelf, the blood it threw up ap- 

 peared to him to be more than the whole body of the infect could 

 have contained. 



The exuvia, or caff {kin of infects, being exceedingly tranfc 

 parent, are well adapted for obfervation, as they exhibit the out- 

 ward appearance of the little animal ; among thefe we may reckon 

 thofe of fpiders and cimeces, but particularly the forficula, or 

 earwig, which is an elegant exuvia. The flings of infects vary 



4 R not 



