108 



ACAEINA OK MlTifiS. 



these stages may be found in a single web at one time. The 

 females hibernate during the winter months, seeking shelter in 

 such places as the cracks in hop-poles, under dead leaves, in 

 fact in aU crevices and shelters where they are protected from 

 frost and snow. These, and all mites, flourish best in hot and 

 dry weather. They damage the plant in a twofold manner, — 



, -p»p. 



FiQ. 43. — Harvest Bug {Leptus autwmmalis), the larva of T. holosericcum (magnified 

 100 diameters). Bailliet. (From Neumaim.) 



first by sucking out the sap, and secondly by blocking up the 

 stomata of the plant by their webbing and excreta. The 

 mouth consists of a pair of biting jaws and a sucking-tube be- 

 tween. The tissue is first bitten, and then the sucking-tube is 

 thrust into the hole and the sap extracted. No mites, we must 

 remember, have any external breathing-pores, but respire by the 

 whole body - surf ace. All washes used for destroying them 



