328 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



informed the owner that the wheat was suffering from an attack of 

 Hessian Fly, an assertion which I felt fully justified in flatly contra- j 

 dieting ; and some months afterwards, when the larVcT. had buried them- ' 

 selves and so got beyond control, the advisers informed the owner that 

 the larvae were those of " Diplosis aurantiaca, a dangerous wheat-pest." i 

 I sent a photograph to Dr. L. 0. Howard, the United States | 

 entomologist, head of the Bureau of Agriculture, who informed me that 

 nothing of the kind had been seen in iVmerica, and that it was quite 

 new to him. I kept the larvse in the soil until June 1909, when, on 

 examination, I found several in very much the same condition as when 

 I last saw them. I asked Mr. Mainland to send me a good supply. 



Fig. 118. — A whole plant of Barley showing slits in leaf-sheath 



MADE BY GRUBS OF " TeNBY WhEAT PeST." ThE GRUBS, 6 TO 9, BETWEEN 

 THE KNOTS ARE CONCEALED BETWEEN THE STALK AND THE SHEATH. (Half 



natural size.) 



which he did on June 12. Some of these I observed change to pupa^ 

 which very much resembled the larvae in colour. Previous to pupating, 

 the larvae, by twisting and twirling about, managed to work themselves 

 into the soil, where they scooped out a small oval chamber in which 

 to pupate. Some of these I accidentally ruptured digging up, but in 

 others I observed the larval skin cast and the pupa produced. 



At first the legs were difficult to discern, as they scarcely projected 

 beyond the body. In the course of a week the eyes and wings began 

 to darken, and the legs became more distinct; the abdomen, too, and 

 the dark dorsal marks stood out distinctly, until, just a month after 

 pupating, I bred six female flies. These, together with my original 

 photographs of the mjured stalks, I placed in the hands of Mr. 0. 0. L. 

 Waterhouse, I.S.O., who very kindly handed them over to Mr. E. E. 



