48 



The general appearance of the female is shown in figure 16 at a, much 

 enlarged, the segments of the antennas being shown still more enlarged 

 at 1). ,The genitalia or sexual organs of the male are illustrated, also 

 greatly enlarged, at c. 



DISTRIBUTION. 



It seems probable that this species, like others found in greenhouses', 

 and in habitations, storehouses, and indoors generally, has been intro- 

 duced from abroad; and it is perhaps tropical, at least in origin. The 

 present known distribution includes the following localities: Wash- 

 ington, D. C. ; Richmond and Gordonsville, Va. ; N} T ack, Tappan, and 

 Corn wall-on -the-Hudson, N. Y. 



Fig. 16. — Diplosis violicola: a, female fly; b, female antennal joints; c, male genitalia: d, larva; e, 

 breastbone of larva — a, b, much enlarged: c, d, e, more enlarged (from Coquillett). 



This species first attracted attention in 1896, when it was noticed by 

 Mr. Dorsett on sweet violets in the vicinity of Washington, D. C. One 

 of our correspondents, Mr. W. V. V. Powers, writing under date of 

 January 27, 1899, stated that he had noticed this insect three years 

 earlier, and although he could not feel certain that there was any con- 

 nection between the appearance of this pest and the introduction of 

 the so-styled California violet, it was noticed that they both appeared 

 the same year in his vicinity, Cornwall-on-the-Hudson, N. Y. 



NATURE OF INJURY. 



The maggots, as previously stated, conceal themselves in folds of 

 the young, growing leaves, causing a distortion or curling into irregu- 



