Report of the State Entomologist 245 



been found there, as a miner in the leaves of Chrysanthemums, Eupa- 

 toriums and Cinerarias in greenhouses. The mines are irregular, 

 and are often so abundant that the upj^er and lower epidermis of the 

 leaf alone remain, and these, of course, soon shrivel and dry. 



Differences Shown in the Mines. 

 The leaf figured above is that of the large Japanese Chrysanthemum, 

 in which the operations of the larva are rather rare. Upon comparing 

 the figure with the leaf represented in my Fourth Report, a great 

 diflference will be seen in the direction of the mines in the two. In 

 the latter — in the large number of the leaves sent me, in every one 

 the mine was almost wholly confined to the margin, following closely 

 each division and tooth of the leaf, and in no instance crossing itself; 

 while in that figured by Mr. Jack its course is quite irregular, tortu- 

 ous, frequently crossing, and onhj in two places touching the margin, as if 

 by accident. This great' variance would seem to be quite in excess of 

 what might be expected from the dissimilarity — marked as it is — in 

 the size and shape of the leaves of the two chrysanthemums. 



Do the Differing Mines Indicate Distinct Species ? 



A difference so marked suggested the possibility that the flies sub- 

 mitted to Mr. Kowarz may not have been identical with those that had 

 been placed in Baron Osten Sacken's hands. It did not appear that 

 there had been direct comparison of the two lots of specimens, nor 

 had an exchange been made between Mr. Jack and myself. To set 

 the question at rest, a number of those reared by me in 1887 from the 

 Long Island larv:e, was sent this autumn to Mr. Kowarz, with the 

 request that he would compare them with those in his possession 

 received from Mr. Jack. 



Shown by Comparison to be Identical. 



In a letter promptly returned the undoubted identity of the two 

 was declared: the last sending was Ph. chrysanthemi in litt. In addi- 

 tion thereto, Mr. Kowarz has kindly made comparison of the species 

 with Ph. affinis and with Ph. lateralis, which we gladly transcribe as of 

 interest and value to the student. 



Compared with Other Species. 



This species is the nearest of all to Ph. affinis Fall, Zett., Schin. 

 It is very similar, but is distinguishable from this b_> the lack of the 

 acrostichal bristlets, and by the relatively shorter and weaker ovipos- 

 itor of the female : unfortunately I could not compare it with the 

 male affinis. Ph. chrysanthemi has sometimes a row of acrostichal 

 32 



