ORDERS. 



31 



usually, besides the three pairs of claw-feet, five to 

 seven pairs of sucker -feet under the body, and a pair 

 at the end of the tail. 



The above figures, and short notes, give just the 

 primary distinctions between five orders of insects, in 

 each of which the insect is completely different in its 

 two first stages, that is, in its larval and jmpal 

 condition, to what it is in the imago or perfectly deve- 

 loped state. Further characteristics, especially those 

 which are of use practically, are mentioned under the 

 heads of the different orders ; but even elementary 

 knowledge, such as the above, is of service as a guide 

 to the nature of crop attack which may be under 

 observation. 



Of the eight remaining orders, there are five in 

 which the insects are nearly alike throughout their 

 lives, and also in many cases troublesome to us : 

 these are the orders containing, 1, the Grasshoppers, 

 Locusts and others ; 2, the Earwigs ; 3, the Aphides 

 and others ; 4, the Plant-bugs ; and 5, the Thrips. 



3) 



Fig. 20. — Locust. {Orthoptera.) 



Locusts {Ovtltoptera) — straight-winged — have the 

 under wings folded lengthwise, or straight beneath 

 the upper pair. 



