THE MONTHLY BULLETIN. 



85 



Distribution. — Very common and destructive, especially in the cen- 

 tral hop -growing districts of the State. 



Food Plants. — This is primarily a hop pest and is certainly one of 

 the worst enemies of that crop. It also feeds upon plum trees, occur- 

 ring upon either hops or plums throughout the summer. 



THE PARSNIP LOUSE. 



Hyadaphis pastinacw (Linn.). 

 (Fig. 67.) 



General Appearance. — The apterous forms are pale apple green, 

 occasionally with small red spots on the dorsum. The winged forms 

 are green with dark head, antennae, thorax, middle of the abdomen, 

 tips of cornicles and leg joints. The species is recognized by the small 

 tubercle on the posterior of the abdomen just above the style. 



Life History. — This is one of the most widely spread species, occur- 

 ring on many hosts throughout the early spring and summer months. 

 Due to its varied host plants it seldom becomes serious on any one of 

 them. 



Pig. 67. — The parsnip louse, Hyadaphis pastinacw (I^inn.), winged female and 

 detailed drawings of characteristic appendages. (Bssig, P. C. Jr. Ent. ) 



