APHIS EDENTULA. 39 



" Winged viviparous female. 



" More slender than the apterous insect. Antennae 

 more than half the length of the body. Thoracic lobes 

 dark. Cornicles about iVth of the length of the body. 

 Legs moderately long. Feet, tips of the thighs, and the 

 shanks brownish. In July on the roots of the parsnip, 

 occasionally at the depth of one foot beneath the sur- 

 face, whereto (wherefrom ?) it crawls when the wings 

 are about to be developed." 



There appears to be several other true Aphides 

 having seven joints in the antenusD, which also have 

 this singular underground habit. Aphis farfarce will 

 be presently mentioned, and there is Aphis terricola 

 also of Rondani and of Passerini. This last insect 

 has not, as yet, been noticed in this country. It may 

 be recognised by its extended rostrum projecting far 

 beyond the extremity of the body. 



If A. carotce be identical with A. siibterranea the 

 insect must have two distinct modes of life, being, at 

 different times, aerial or subterranean in habit. This 

 peculiarity will recall the fact that has been well 

 authenticated, that the great vine-scourge. Phylloxera 

 vastator of Lichtenstein, has a similar habit of attacking 

 either the root or the leaf, according to certain local 

 causes, of which, at present, we seem to know nothing. 



In France the underground apterous Phylloxera is 

 by far the most destructive, but in America the aerial 

 leaf-destroyer seems to be doing the greatest damage 

 to the vineyards. 



Aphis edentula, Bucldon. Plate XLVIII, figs. 1 — 3. 

 Apterous viviparous female. 



