The Cabbage Root Maggot. 577 



it is in too poor condition to identify definitely ; yet Dr. Lintner, in a foot- 

 note gives a description of the wing venation which I think agrees closely 

 with that of brassictT Bouche. In 1887, Prof. Cook recorded some exper- 

 iments which proved that the Cabbage and Radish Maggots would breed 

 freely on either food-plant and were thus doubtless identical ; his con- 

 clusions from these experiments led him too far, however, for he came to 

 believe that the maggots infesting onions [Phorbia cepartcm Meig.), beans 

 {Phorbia fusciceps Zett. ), and raspberry canes (an Anthomyiian, possibly 

 new) were either identical with or but varieties of brassicce Bouche.* 

 During the last few years, all Americans have been more and more 

 inclined to regard the Cabbage and the Radish Maggots as identical specific- 

 ally. 



I think there is much in the above evidence to support the conclusion 

 that the radish and the cabbage maggots are the same insect ; my breeding 

 experiments and the above mentioned examination of Radish Flies from 

 difierent parts of the country, also strongly support this conclusion.! 

 Therefore, I have included all references to the Radish Fly or Maggot in 

 the bibliography. Mark Vernon Slingerland. 



* These determinations are made from specimens received from Prof. Davis, including 

 some of the specimens bred by Prof. Cook, and from Mr. Fletcher. 



t There are two other Anthomyiians recorded as feeding on cabbage and radish 

 namely, Phorbia fusciceps Zett. and Anthomyiia radiciim Linn. The former is very 

 common and the latter rare in this country, where I believe, however, their attacks upoa 

 cabbages or radishes are exceptional. 



