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Genus XXXIX. APHIS. 



GENERIC CHARACTER. 



Antenna setaceous, longer than the thorax. 

 Rostrum inflected. Wings four, erect, or 

 none at all. Abdomen with two little horns 

 or spines on the hinder part. Feet formed 

 for walking. 



General Observations. 



The following account of the Aphides is 

 extracted from Stuart's Elements of Natural 

 History. "The insects of this genus are small 

 and defenceless, but very noxious animals, and 

 most remarkable for the singularities in their 

 history and manners. There are many species 

 of the genus, which, for the most part, inhabit 

 particular plants, attaching themselves gene- 

 rally to the young twigs, to the footstalks or 

 leaves, and exhausting the juices ; by which 

 means these parts, particularly the leaves, are 

 deformed and destroyed. They exude, partly 

 from the horns on their abdomen, and partly 

 from two orifices at the same place, a sweetish 



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