THE 



■I vl'\[-'i'4'A^i4'4' 



A MONTHLY BULLETIN, 



Publislied by tlie Entomological Society of Pliiladelpliia, for the dissemination of valuable 

 knowledge among Agriculturists and Horticulturists, 



Vol. II, No. 4. 



JANUARY, 1867. 



Whole No. 16. 



j^9"Publi3he<i by the Entomological Society op Phil- 

 adelphia, at their Hall, No. 618 South Thirteenth Street, 

 Philadelphia. 

 ^^g-Edited by Brnj. D. WALsn, Rock Island, Illinois. 

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PHILADELPHIA, JANUARY, 1S67. 



Plant- Uce — their Friends and their Enemies. 



Every one must have noticed, that in the sum- 

 mer time the tips of the young shoots of apple-trees 

 often become covered with very fine blackish pow- 

 der, the leaves on them curl up and assume an un- 

 healthy blackish appearance, and on examination 

 both the twigs themselves and the under surface of 

 the leaves are found to be swarming with myriads 

 of minute greenish lice, some of them winged, but 

 most of them without any wiugs. These are Plant- 

 lice, belonging to the genus Aphis and the Aphis fa- 

 mily of the Order Homoptera. The annexed cut 

 shows one of the winged individuals, liighly mag- 

 nified ; and the wingless ones do not materially dif- 

 fer, except in having no wings. The hair-line to 

 the left of the figure shows the natural size of the 

 insect, which is called the Apple-tree Plant-louse, 

 (Aphis mali,) and is found in every State, from 



Colors — (jrecn and Black. 



Jlaiiie to Kentucky and from Penn- 

 sylvania to Kansas. The lower fi- 

 gure shows one of the wingless in- 

 ividuals, similarly magnified, and 

 that to the right a winged speci- 

 flien, but slightly magnified, and with its wings 

 closed over its back. 



Every one must also have noticed, that in the 

 summer time the leaves of currant -bushes are fre- 

 quently covered with irregular bulges or blister- 

 like elevations on their upper surface, with corres- 

 ponding hollows on their lower surface. These 

 liollows, on a closer inspection, will be seerj to be 



