affecting the Potato-crops. 



117 



Fig. 7.* The larva state of Hylophila. 



Fig. 8. The natural size. 



Fig. 9. The head and thorax in profile. 



a. The antennae or horns. 



b. The rostrum or beak. 

 Fig. 10.* Pupa of Hylophila Nemorum. 

 Fig. 11. The natural size. 



Fig. 12.* Hylophila minuta. 



Fig. 13. The natural size. 



Fig. 14.* Larva state of Thrips minutissima. 



Fig. 15. The natural size. 



Fig. 16.* Thrips minutissima flying. 



Fig. 17. The natural size. 



Fig. 18.* Smynthurus Solani, the potato ground-flea; its natural 



size is that of a grain of sand. 

 Fig. 19.* A Smynthurus in profile, to show its leaping apparatus. 

 Fig. 20.* Lygus Solani ; the potato-bug. 



c. The natural length. 

 Fig. 21.* Pupa of the same. 



d. The natural length. 

 Fig. 22.* Lygus contaminatus. 

 Fig. 23. The natural size. 



Fig. 24.* The head in profile. 



e. Base of the antennae. 



f. The rostrum. 

 Fig. 25.* Lygus bipunctatus. 

 Fig. 26. The natural size. 

 Fig. 27.* Lygus umbellatarum, 



g. The natural dimensions. 



Fig. 28.* Eupteryx Solani, the potato frog-fly. 



h. The natural dimensions. 

 Fig. 29.* The head in profile. 



i. The antenna. 

 k. The rostrum. 



Fig. 30.* The egg. 



/. The natural size. 

 Fig. 31.* The pupa state. 

 Fig. 32.* Eupteryx picta. 



m. The natural dimensions. 

 Fig. 33.* Altica or Macrocnema exoleta ; the potato flea-beetle. 

 Fig. 34. The natural size. 



EXPLANATION OF PLATE V. 



Fig. 35. Eggs of Tipula Oleracea. 



n* One magnified. 

 Fig. 36. The larva or maggot from the same. 



o.* Tail or stern, viewed in front. 

 Fig. 37. The pupa state of the same. 

 Fig. 38. Abdomen of the male fly, in profile. 



