1 18 Various Insects affecting the Potato Crops. 



Fig. 39. Female Tipula Oleracea, or crane-fly. 

 Fi«-. 40. Abdomen of the male of Tipula maculosa. 

 Fig. 41. Female Tipula maculosa. 

 Fig. 42. Larva or maggot of the same. 

 Fi"-. 43. The same contracted. 



j>.* Tiie tail or stern, viewed in front. 

 Fig. 44. The pupa state of the same. 



Fig. 45. Geophilus clectricus {?), or Anthro?iomalus lorigicornis. 

 Fig. 46.* Acarus or Tijroghjphus farinm : the flour-mite. 



q. The natural size. 

 Fig. 47.* Psychoda nervosa. 



r. The natural dimensions. 

 Pupa, view of the back. 

 Ditto, ditto, the underside. 

 Ditto, ditto, nearly in profile and attenuated. 



s. The natural size. 

 Larva or maggot of Sciara quinquelineata, 



t. The natural size. 

 Pupa of the same. 



It. The natural size. 

 Sciara (or Molohrus) quinquelineata, 



V. The natural dimensions. 

 Musca stahulans. 



w. The natural dimensions. 

 The larva or maggot of the same. 

 The pupa. 

 Anthomyia (or Homalomyia') tiiberosa. 



X. The natural dimensions. 

 Larva of the same. 



y. The natural size. 

 Drosophila cellaris., the cellar-fly. 



z. The natural dimensions. 

 The larva or maggot of the same. 



a. The natural size. 

 Fig. 61.* Pupa of the same. 



b. The natural size. 



Fig. 62.* Chelifer ificequalis, a false-scorpion. 



c. The natural size. 



Fig. 63.* Vibrio (or Rhabditis) tuberculorum, greatly magnified. 



Obs. — Those numbers with a * attached, refer to the objects which 

 are represented larger than life, and all the figures are drawn from 

 nature, excepting No. 63, which is copied from M. Guerin's plate. 



(The Copyright of this Paper is reserved to the Writer.) 



Hayes, near Uxbridge, February., 1849. 



