PERGANDE NORTH AMERICAN PHYLLOXEKlNjE. 271 



to the life history of this insect, and the economic relations of the 

 species to the cultivated and wild varieties of grape-vines. 



Excellent descriptions and illustrations of it may be found in 

 Dr. C. V. Riley's Sixth Report on the Noxious and Beneficial 

 Insects of Missouri for 1871, pp. 30-86. 



ERRATA. 



Page 217, line 21, from above, read Ph. globosa. 

 Page 236, bottom line, read 393. 

 Page 236, line 3, from bottom, read 1867, p. 2. 

 Page 236, line 6, from bottom, rt-aA globosa . 

 Page 247, line 15, from above, read spinuloides . 



