no(y Microscopical Essays. 



not only in their form, but alfo in their apparatus ; mod of* them 

 require diffettion, as the flings (for they have generally two) are 

 inclofed in a hard fheath, or cafe, to which is added a pair of 

 feelers. The flings of bees, wafps, &c. are barbed, while that 

 of the^hryfis is ferrated, or notched like a faw.. 



The head of infecls is furnifhed with an inftrurnent, or pr©^ 

 bofcis, various as the infects themfelves, but all deferving the 

 utmofl attention, being admirably adapted to their different ufes 

 and purpofes. Among the mofl remarkable are the bed bug r 

 flea, gnats, empis, conops, &c. to which we may add the Angu- 

 lar one of the tabanus, which we have juft now defcribed* Wc 

 have alfo fo fully defcribed the bee's apparatus,, page 362, that it- 

 is unneceffary to enlarge on it here., 



The antennae of moths, butterflies, and mofl: other- infecls, 

 difplay as great beauty in their formation as they are endlefs in; 

 their variety ; the diftinguifhing characters of many of them have 

 been defcribed, page 175; and that of the lepas antifera in par- 

 ticular, page 359. 



The eyes of infecls are Angularly contracted, but this.ftruclure 

 is not difcoverable without the afli fiance of the microfcope ; the 

 eyes of the libellula are hexagonal, vide Plate XVI. Fig. 3 ; 

 while thofe of lobfters are fquare, as may be feen Plate XVI.. 

 Fi g- 5: 



Hair of animals, as the moufe, goat, large bee, and many fpe- 

 ties of caterpillar, particularly the tufts on the head and tail of 

 the larva of the phalaena antiqua, offer many beauties to the 



curious, 



