ii6 



AN ECO ATOMIC ENTOMOLOGY. 



and other fruit trees, willow, lilac, and a great variety of other 

 plants. It is perhaps uncertain whether all are really one species, 

 but for our present purpose we may consider them so. There is 

 one brood only, and they winter in the egg state, the larv^ 

 appearing in spring, the time depending upon the weather. In 

 the South there may be two broods, but I believe that there are 

 few exceptions to the rule that wintering takes place in the egg 

 stage. On orange and other citrus plants we have species closely 

 resembling that on the apple, and not distinguishable except on 



Fig. 87. 



Mytilaspis pomorion. — a, male ; b, its tarsus ; c, young larva ; d, its antenna ; e, female. 



close examination, even by the specialist. These scales some- 

 times cover twigs and large branches completely ; even the leaves 

 are often infested, and not infrequently the fruit itself becomes 

 more or less covered. It is not unusual to see in market oranges 

 and lemons more or less spotted by these oyster-shell scales, and 

 I have seen lemons from Mediterranean countries with the skin 

 almost entirely hidden by them. 



