380 



THE ENTOMOLOGIST. 



[Oct. 



wing pads are very indistinct, hardly visible ; but in spring they are 

 plainly marked. 



I*rofessor Riley on examining specimens, which the above figures 

 are meant to illustrate, and which were sent him by Professor Cook, 

 states that an old well-known pest, Isosoma hordci (Harr.), has only 

 been re-described. 



Fig. 7 gives representations of Isosoma Jiordei, the true Joint- worm 

 riy, which was also a great wheat pest thirty years ago. It remains 



a, female, with her antenna and abdomen enlarged (c, e) : b, male, with same parts enlarged 0!, /).— 

 After Biley. 



in the straw during autumn and winter ; indeed, burning the straw 

 appears to be the most effectual remedy. 



Fig. S. 



Isosoma tritic', the v^ingless Joint-worm Fly— showing female (/) ; larva (a, h) ; and rudimentary 

 wing (0 ; with full developed wings (g, h) of exceptional individuals.— After Riley. 



Dr. Fitch proposed to separate this species into three distinct ones, 

 viz. : /. tritici, sccalis, and favicc2r. But the researches of AValsli 



