400 
Leaves of the same plant were also received February 28, 1890, from 
the greenhouse of James Bead, Irvington, N. Y., and from these the 
adults were reared on the 5th of the following month. Quite a large 
series of chalcidid flies belonging to the genus Ohrysocharis 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 specimens 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 April 3. 
A second package of infested leaves of the marguerite and feverfew 
were received from Mr. Ives April 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 April 5 to 14. 
Still another package of infested leaves of the marguerite were 
received June 5, 1890, from John Akhurst, of Brooklyn, ET. 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 j specimens have been submitted to one 
of the best German authorities on this group of insects, Mr. Ferdinand 
Kowarz, and he was unable to identify it with any of the described 
Euroj)ean 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 affinis, 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 dex3redating of this pest upon cultivated 
plants appears to date from the month of October, 1886; 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 Beport, correcting the erroneous identification published in 
the previous accounts. 
