49 



Ya«, witli the statement that these insects bad been quite destructive 

 to his violets during the months of June and July for two years past. 

 The attack was principally directed against the youngest leaves, which 

 in a short time turned brown and dropped from the plant. As many 

 as a dozen larvse were sometimes found within a single folded leaf. 



September 9 and 21, 1897, larvse of this species were also received 

 at this office from Mr. W. Davison, of Nyaek, N. Y.; and on August 

 31, 1898, others were received from Mrs. J. H. Marbacher, Tappan, 

 K. T. The latter stated in an accompanying letter that her violet 

 plants were literally covered with these larva? in the folded and dis- 

 torted leaves. From those received, 3 adults issued on the 9th ot the 

 following month. 



Fig. 28. — Diplosis violicola : a, female fly; b, female aritennal joints; c, male genitalia; d, larva; 

 e, breastbone of larva — a, 6, much, enlarged; c, d, e, more enlarged (original). 



Under date of October 12, 1898, Mrs. J. Sampson, Gordonsville, Ya., 

 wrote that a " gall fly," p.esumably this species, had been injurious to 

 violets grown in beds during the 'early spring of that year, but all the 

 infested leaves had been picked off and destroyed and no specimens 

 were available at the date of writing. 



Writing under date of January 27, 1899, Mr. W. V. Y. Powers, 

 Cornwall-on-Hudson, N". Y., stated that he had noticed this species 

 about three years previously, and had been troubled with it more or 

 less ever since. He was not certain that there was any connection 

 between the appearance of this pest and the introduction of the so- 

 called California violet, but stated that they both appeared the same 

 year in his vicinity. 



11608— No. 22 1 ; 



