50 BULLETIN NO. 4, DIVISION OF ENTOMOLOGY. 



accomplish their work, and the leaf loses vitality. Where these insects 

 have made a puncture on the rib, a woody scar remains, and where 

 these scars are numerous those parts of the leaf farthest from the main 

 ribs are thinner and more flaccid than in healthy leaves; and such 

 leaves, and no others, are affected by the " honey dew." A few of the 

 leaves turn brown, but the vine is not in the least injured and the qual- 

 ity or quautity of the crop is not in the least affected. 



The same remedies used against the Aphis will prove useful against 

 these insects. 



In addition to the insects hereiubefore enumerated, there are a few 

 beetles, belonging to the Chrysomelidw or leaf-eating beetles, and prin- 

 cipally the flea beetles. Most common of the latter is the red-headed 

 flea beetle (Systena frontalis), a black beetle about a quarter of an inch 

 in length, with a red head, and with very heavy hind legs; a good 

 jumper and no mean flyer. Next comes the striped flea beetle (Phyllo- 

 treta vittata), a black beetle less than one- tenth of an inch in length, with 

 two yellow stripes on the wing covers. Finally comes the punctured 

 flea beetle (Psylliodes piuictulata), a brownish species, less than one- 

 sixteenth of an inch in length. None of these are very numerous, and 

 they are not found in all yards nor all together in any one yard. They 

 eat small holes in the leaves and do no great damage. 



The twelve-spotted leaf beetle (Diabrotka 12-punctata), a yellow bee- 

 tle about a quarter of an inch in length, with twelve spots on the wing 

 covers, has the same habit, and appears in small numbers in all yards. 



