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Genus XL. CHERMES. 



GENERIC CHARACTER. 



Antenna setaceous, longer than the thorax. 

 Rostrum placed in the breast, and formed of 

 a triarticulate sheath, and three unequal 

 bristles. Wings four, deflected. Thorax 

 gibbous. Abdomen terminated by four very 

 short filaments. Feet formed for leaping. 



General Observations. 



The insects of this genus, like the Aphides, 

 are found on the leaves, young shoots, and bark 

 of different vegetables. The larvse have six 

 feet; and are generally covered, more or less, 

 with down. Some have on the hind part of 

 the body a flocculent substance of a white co- 

 lour. This is particularly seen in the larva of 

 the C. Aim; and if rubbed off will be quickly 

 reproduced. The winged or perfect insects 

 leap with great agility. The females occasion 

 the little tubercles or galls, seen upon the leaves 

 of the ash and other trees, by wounding them 



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