THE MONTHLY BULLETIN. 



63 



Natural Enemies.— The ladybird beetles, Hippodamia convergens 

 Guer. and Hippodamia amhigua Lee. ; the internal parasites, Ai)hidius 

 testaceipes (Cresson) and Charips xantkopsis (Ashm.) and the larvae 

 of the green lacewing {Chrysopa calif ornka Coq.) all prey upon this 

 louse. 



THE ENGLISH IVY PLANT LOUSE. 



Aphis hederw Kalt. 



(Fig. 51.) 



General Appearance.— The apterous females are usually abundant 

 on tender shoots of the English ivy, and vary from brownish to black, 

 often with a pruinose coat which gives them a gray appearance. The 

 Avinged forms are very dark. 



Life History.— The apterous forms begin to appear in early spring 

 and continue to breed until late summer, when the work of internal 



Fig. 51. — The ivy louse (Aphis liederw Kalt.). A, adult winged female and 

 antenna; B, adult apterous female and antenna. (Bssig, P. C. Jr. Ent.) 



parasites becomes such as to almost exterminate the pesl. Winged 

 forms also occur until late summer. The louse does some damage 

 early in the summer, but is not a serious pest. 



Distribution. — Throughout the entire .State, but more abundant in 

 the southern part. 



Host Plant. — English ivy. 



Natural Enemies. — Held in complete check by a small internal 

 parasite. The mummied bodies appearing in the fall show the efficient 

 work of this natural check. 



THE CORN LEAF-APHIS. 



Aphis maidis Fitch. 

 (Fig. 52.) 



General Appearance. — The adult aphids are bluish-green in color. 

 Young lice vary from a reddish brown to the color of the adults. 



