132 Annals Entomological Society of America [Vol.1, 



Coccinellid and chrysopid larvae have often been observed 

 feeding on the dimorph. 



The first paper on the American dimorph is an article by Mr. 

 L. C. Bragg in Entomological News for December, 1907. His 

 statement that it does not molt or reproduce is incorrect. In com- 

 paring the European dimorph with the American dimorph he 

 states that the former has fourteen leaf-like appendages on the 

 abdomen and the latter twenty-two; I find, however, that both 

 the American and the European dimorphs have twenty-two fia- 

 bella on the margin of the abdomen. Mr. Bragg mentions the 

 maple-aphis (Chaitophorus aceris) as being the species that pro- 

 duces the European leafy dimorph. This was supposed to be the 

 case until Kessler proved that they were borne by Chaitophorus 

 testudinatus and not by C. aceris. He found that C. aceris pro- 

 duces dimorphs, to be sure, but dimorphs without leafy appen- 

 dages. 



Professor Oestlund, in a paper on this dimorph in Entomologi- 

 cal News for March, 1908, summarizes the more important liter- 

 ature on the European dimorph. He refers to the species as 

 occurring on "maples," but informs me by letter that he used 

 this name for Acer negundo, the common box-elder. He uses 

 the name testudinatus instead of negundinis for this species; but 

 it appears from Kessler' s paper that the adults of testudinatus 

 are quite different from those of negundinis — so different that we 

 can scarcely regard the two species as one. 



