HEMIPTERA. 205 



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

 great numbers of reddish brown bark-hoe, 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 oc- 

 cur till the last summer, when I was led to the discovery of a few 

 of these lice on my Isabella grape-vines, by seeing the ants as- 

 cending and descending the stems. Upon careful search I dis- 

 covered 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 observations were arrested by a fire which 

 consumed the house and the vines that were trained to it. 



