On the Insects affecting the Turnip Crop. 



213 



doms^ they are generally succeeded by a respite of many years, 

 which throws us so much off our guard, that when they return we are 

 not prepared with any proper remedies, and not unfrequently they 

 are altogether forgotten ; thus after a lengthened interval of tran- 

 quillity, when we think the hordes of hostile insects have departed 

 for ever, they suddenly make their appearance, and take us by 

 surprise and at advantage. The intelligent farmer must therefore 

 be up and stirring, to detect the first breath of infection, and be in- 

 stantly prepared with his remedy. 



EXPLANATION OF THE PLATE. 



Fig. 1. The egg of the striped turnip-beetle or fly, AUica nemorum. 



Fig. 2. The larva or caterpillar. 



Fig. 3. The pupa or chrysalis. 



Fig. 4. The beetle or fly represented walking. 



Fig. 5. The same flying. 



Fig. 6. A turnip-leaf : 



a The burrows formed by the caterpillars. 



h A male beetle feeding, of its natural size. 



c A female beetle at rest. 



d Holes recently eaten by the beetles. 

 Fig. 7. Six organs of the mouth : 



e The labrum or upper-lip. 



/ The two toothed mandibles. 



g The two maxillse or jaws. 



h Their palpi or feelers. 



i The mentum or chin. 



k The labium or under-lip. 



I The labial palpi or feelers. 

 Fig. 8. k hind-leg : 



m The thigh. 



n The tibia or shank. 



0 The tarsus or foot. 

 Fig. 9. Altica concinna, the brassy or tooth-legged turnip-beetle ; the 

 smaller figure shows the natural size. 

 Fig. 10. A hind-leg of the same : 



m The thigh. 



n The tibia or shank, Vvrith the tooth and spines. 



0 The tarsus or foot. 

 Obs. All the figures are highly magnified, excepting those upon the 

 leaf, and they are all drawn from nature; but Nos. 1, 2, and 3 were 

 furnished by a friend ; their natural sizes are given beneath each object, 

 and marked with a * ; the line and crossed lines also added to figures 4 

 and 5, give the length and breadth of the living insects. 



