THE MONTHLY BULLETIN. 



61 



WOOLLY CITRUS APHID. 



Aphis cookii Essig. 

 (Fig. 49.) 



General Appearance.— The bodies vary from light gray to very dark 

 brown or almost lilack, and are covered with short or rather long white 

 cottony wax, which is arranged in transverse rows across the abdomen. 

 This covering often almost completely hides the insects. 







'CSISSISSD 





Fig. 49. — The woolly citrus aphid (Ai)his cookii Essig). A and B, adult forms; 

 C, third antennal articles ; D and E, antennse of winged and apterous females ; F 

 and G, cornicles of winged apterous females ; H and I, pygidium and style of winged 

 female ; J and K. pygidium and style of apterous female ; 1-4, fourth antennal 

 articles; 5-6, fifth antennal articles; 7, proce.ss of sixth antennal article. (Essig, 

 P. C. Jr. Bnt.) 



Life History.— Is not well known. The insect was first discovered 

 by C. H. Vary at Pomona, California, in April, 1910. He brought 

 specimens to the writer, stating that the original infestation wa^ 

 destroyed. Attempts to find other specimens proved futile. Whether 

 the insect was introduced or came from native shrubbery is unknown. 



Distribution. — Only one locality, near Pomona, California. 



Food Plants. 



-Navel orange trees. 



THE MELON APHIS. 



Aphis (jossijpii Glover. 

 (Fig. 50.) 



General Appearance. — The lice are small and very dark in color, 

 varying from dark green or brown to black. The apterous female is 

 usually dark green with often irregular lighter markings on the abdo- 



