224 



INSECTS INJURIOUS TO VEGETATION. 



pupa state. The means for destroying these insects are the 

 same as those recommended for the extermination of the pre- 

 vious species. 



Many years ago, when on a visit from home, I observed on 

 a fine native grape-vine, that was trained against the side of a 

 house, great numbers of reddish brown bark-lice, of a globular 

 form, and about half as large as a small pea, arranged in lines 

 on the stems. An opportunity for further examination of this 

 species did not occur till the summer of 1839, when I was led 

 to the discovery of a few of these lice on my Isabella grape- 

 vines, by seeing the ants ascending and descending the stems. 

 Upon careful search I discovered the lice, which were nearly 

 of the color of the bark of the vine, partly imbedded in a little 

 crevice of the bark, and arranged one behind another in a line. 

 They drew great quantities of sap, as was apparent by their 

 exudations, by which the ants were attracted. Further obser- 

 vations were arrested by a fire which consumed the house and 

 the vines that were trained to it. 



