156 DIPTEROUS NOTES AND QUERIES. 



mine could be easily detected, being well marked by its pale 

 appearance on a dark green ground. The perfect insect 

 seems to make its exit from the mine at a point on the margin 

 of the leaf — the mine terminating there, and a small hole 

 being visible. I could not find the larva. 



V. A Dipterous larva mines the leaf of Pimpinella 

 magna, making a broad tortuous path, with so many wind- 

 ings that the whole of the substance of the leaf appears at 

 times nearly eaten away. The larva I have not seen. This 

 mine I noticed sparingly in the neighbourhood of Folkestone, 

 Kent, in the month of September. 



VI. A long snake-like mine commencing at the margin 

 of the leaf of the common alder, Alnus glutinosa, and in- 

 creasing in size as it advanced, was brought to my notice by 

 my friend Mr. Stainton. He found it near Reigate in Sep- 

 tember. The larva was dead and shrivelled before I ex- 

 amined it. It was undoubtedly Dipterous. 



Now as to the second division of my inquiries, namely, 

 Dipterous larvae forming gall-like excrescences, I shall be 

 glad of any information which may aid in making the fol- 

 lowing observations more complete. 



VII. At Bulverhythe near St. Leonards, in the beginning 

 of August, I found several gall-like swellings on the stems of 

 the common reed, Arundo phragmites, which were composed 

 of the distended bases of the leaves closely packed one over 

 the other, the further growth of the stem having been 

 stopped by the action of a Dipterous larva, which was 

 to be found snugly enjoying itself in the centre of the mass. 

 These gall-like appearances were oblong ovate, varying 



