NATURAL FOOD. 



37 



a, grub of Ephemera ; b b, perforations of Ephemera Grub ; d 

 grub of Dragon-fly. 



Several grubs which do not excavate holes like the 

 preceding, are not very unlike them in general appear- 

 ance, though usually much larger, such as the grubs of 

 various species of beetles, and of dragon flies, of which 

 the one marked d in the figure is an example. These 

 usually trust for safety to the protection of the roots of 

 weeds or a temporary covering of mud; and what are 

 usually termed blood-worms, are found in the same 

 circumstances. 



I mean here water blood-worms, and not the smaller 

 bright red earth-worms sometimes so named in books 

 on angling. These water blood-worms, which are not 

 much thicker than a stocking thread, are the maggots 

 of a small gnat 1 , very abundant near water. These 



(I) In Latin, Chironcmus plumosus, MEIGEN. 



