BUG. 



163 



differ from the parent insect in no other respect 

 than size and colour, being at first much paler 

 than xvlien more advanced in their growth; not 

 arriving at their full size in less than about three 

 months. They live entirely by .Auction, employ- 

 ing for this purpose their sharp and fine trunk or 

 proboscis, which is carried in a strait direction 

 beneath the breast. It is probable that this in- 

 sect, like the Gnat and some others, at first infuses 

 some quantity of irritating fluid into the wound it 

 makes, before it sucks the blood of the animal it 

 attacks, since the swelling which it causes is often 

 very considerable, and attended with severe itch- 

 ing. During the winter months these animals 

 secrete themselves behind walls, wainscotting, or 

 any neglected places, where they are capable of 

 supporting the most intense frost without injury, 

 and on the return of warm weather again emerge 

 from their concealment. When confined in a box 

 for any length of time they will often attack and 

 destroy each other. It is affirmed by Scopoli, 

 whose observations are, in general, distinguished 

 Teat accuracy, that this insect, in the Dutchy 

 of Carniola, is, at certain seasons, furnished with 

 wings, though apterous in other parts of Europe. 

 Mr. Baker, in his work entitled " The Microscope 

 made ca*ii" informs us that the Bug is one of the 

 best subjects for exhibiting a microscopic view of 

 the circulation of the blood. " In the legs of 

 small punices or Bugs (says this writer) the cir- 

 culation is remarkably visible, together with an 

 extraordinary vibration of the vessels, which I 



