Phenacoccus acericola, n. sp.

Since 1880, when the above-named species was founded and described as the European Pseudococcus aceris, Geoff. (Phenacoccus), by Miss Emily A. Smith, it has untill recently been supposed to have been that species.

The latter part of 1890, Prof. Cockerell wrote me that he believed our species was distinct from that of Europe, and suggested that I should describe it as new if upon further investigation no reason appeared to the contrary. At the meeting of the Association of Economic Entomologists of 1891, at Denver, Colorado, he speaks of it as being without a name.