136 ELEMENTARY LESSONS ON INSECTS 



Some of the orders of insects may be recognized by 

 Single Distinctive Characters: 



Hemiptera, by the jointed beak (see p. 72). 



Coleoptera, by the horny fore wings that meet in a straight 

 line down the middle of the back. 



Lepidoptera, by the scaly wings, and by the coiled sucking 

 proboscis. 



Diptera, by the possession of one pair of wings and a pair 

 of halteres. 



Odonata, by the forward position of the legs, and by the 

 forward slant of the side pieces of the synthorax to their 

 bases. 



Ephemerida, by the fluting of the wings, the smallness of 

 the hind wings, and by the long tails. 



Dermaptera, by the short fore wings, the narrow, the 

 fan-like hind wings and the forceps-like appendages at the 

 end of the body. 



Isoptera, by the form and color of the body and the faded- 

 out venation of the wings. 



Mecoptera, by the form of the beak (see p. 133). 



