400 



Leaves of the same plant were also received February 28, 1S90, from 

 the greeuliouse of James liead, Irvington, N. Y., and from these the 

 adults ■were reared on the 5th of the following mouth. Quite a large 

 series of chalcidid flies belonging to the genus Chrysocharis were also 

 bred, but as the other members of this genus are almost without excep- 

 tion parasitic upon other chalcidid or Ichneumon flies, it is quite certain 

 that the present si^ecimens did not prey upon the leaf-miners. Their 

 presence, however, is indicative of the very important fact that these 

 miners have an enemy to contend with in the form of a small four-winged 

 fly that has thus far escaped detection. 



On March 27, 1890, leaves of what is apparently the same kind of 

 plant were received from J. H. Ives, of Danbury, Conn. From these 

 the adult phytomyzids issued from March 31 to Ai^ril 3. 



A second package of infested leaves of the marguerite and feverfew 

 were received from Mr. Ives Ai)ril 3, 1890, and in transmitting them 

 the statement was made that he would be compelled to abandon the 

 growing of these plants owing to the attacks of this pest. From these 

 leaves the adults issued in large numbers Aj)ril 5 to 14. 



Still another package of infested leaves of the marguerite were 

 received June 5, 1890, from John Akhurst, of Brooklyn, N. Y. Several 

 of the adults had issued while on the way. 



Our present knowledge of this insect would appear to indicate that 

 it is indigenous to this country; specimens have been submitted to one 

 of the best German authorities on this grouj) of insects, Mr. Ferdinand 

 Kowarz, and he was unable to identify it with any of the described 

 European species. There is, of course, a possibility that it may exist 

 in that country, and that we may have received it from that source. 

 An allied European species, Phytomyza affinls, so closely resembles it 

 that the one might easily be mistaken for the other, even by an expert. 

 The fact that it has been reported in this country only along the 

 Atlantic seaboard, and that, too, principally in greenhouses, is a fur- 

 ther indication of its having been introduced. 



The earliest record of the depredating of this pest upon cultivated 

 plants appears to date from the month of October, 1880; during that 

 month Dr. J. A. Lintner, State entomologist of New York, received a 

 package of leaves of the marguerite infested with this insect, and in 

 his Fourth Eeport, published two years later, an interesting account of 

 it is given under the erroneous name of Phytomyza lateralis, the 

 species, by some means not easily understood, having been wrongly 

 determined by Baron Osten Sacken. In the American Florist for 

 March 15, 1887, Mr. William Falconer published what is apparently^ 

 the earliest account of this insect under the incorrect name of Phyto- 

 myza affinis. 



Dr. Lintner gives some additional facts concerning this pest in his 

 Seventh Eeport, correcting the erroneous identitication j^ublished in 

 the previous accounts. 



