INJURIOUS INSECTS OF 1904. 



18a 



Life History: This scale belongs to the family Coccidcc, which 

 contains all the scale insects, and its life history resembles in gen- 

 eral that of other scales. Briefly, the young lice hatch in the spring 

 and early summer, immediately migrate to the leaves, and tempora- 

 rily become fixed. Sucking the sap from the leaves, they rapidly 

 increase in size, moulting a number of times as they grow. The 

 males undergo a metamorphosis, emerge from pupal case as minute 

 two-winged insects, mate with the females and die ; the impregnated 

 females later migrate to the twigs and pass the winter fixed to the 

 same. The following spring the developing eggs cause the body of 

 the female to increase in size, and late in May and in June these 

 eggs are laid in the cottony growth which the female has secreted 

 at the posterior end of the body. In the above photograph the cot- 

 tony (waxy) secretion is full of eggs. After laying from 1,000 to 

 2,000 eggs the female dies, probably in July. 



The insect feeds not only on the trees above indicated, but upon 

 various species of maple, upon wild grape, oak, basswood, hack- 

 berry, currant, locust, sumac, box elder^ willow, woodbine (Ampel- 

 opsis), etc. 



A LECANIUM ON CONIFERS AT THE STATION. 



Fig. 165. — Lecaniiivi 



up. on Scotch Pine, showing whitish Coccinelled larvae, Hyferaspis. 

 Original. 



