BUGS. 119 



if their number were not checked by their numerous 

 enemies, as well as by wet, damp weather, and cold 

 winters, all of our vegetable productions would not 

 suffice to nourish them. 



The principal species of this country, which may 

 be seen and examined everywhere, are : 



The Rose-louse : (Aphis Rosas) which is green. 



The Pig-nut " (A. Caryse) which is the largest, viz., one 



quarter of an inch long, and 

 covered with a bluish woolly 

 substance. 



The Cabbage " (A. Brassica?) covered with a white mealy sub- 

 stance. 



The Willow " (A. Salicis) which is black. 



Shield-Lice. (Coccus.) 



The SMeld-louse, also called Bark-louse or Scale 

 Insect, is found upon the branches and leaves of trees 

 ■and bushes, upon which it sits motionless, as if it 

 were glued on, looking more like a wart than a living 

 creature. This, however, is the case only with the 

 female, who inserts her snout into the branch upon 

 which she sits, and remains there imbibing the sap 

 of the plant. In this condition also she deposits her 

 eggs, and after having done so she dies upon the same 

 spot, leaving her dead and dried body a cover and 

 shelter to her young ones. The males have no snout, 

 and walk about the branches at their pleasure. 



