MICROSCOPIC OBJECTS. 



nearly to black. On each, side of the eye are inserted the antenna}, 

 of which there are two pair, the superior being longer than the 

 inferior. They are composed of numerous articulations, from each 

 of which issue two or several hairs. In some species the sexes are 

 distinguished by the form of these appendages, being straight and 

 thicker, with an enlargement towards the middle of their length, 

 in the male, as shown in fig. 4. 



These insects move by sudden jumps or plunges, but sometimes 

 creep along the twigs of plants, in which movements they are 



aided by their feet or branchia3. These members are in almost 

 incessant motion, a circumstance which renders the observation of 

 their precise form in the living animal difficult. One of them is 

 represented as seen under a higher magnifying power in A, fig. 3 ; 

 they are generally transparent, but sometimes have a greenish- 

 blue colour. 

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