18 INSECTS. 



only the upper sheaths or elytra; yet by no means 

 belong to the present order of Aptera. In some 

 few species of Insects it will also be found that 

 one sex is winged, while the other is apterous, as 

 in some of the Moth tribe. The Aphides also, 

 in the order Hemiptera, are known to have. some 

 individuals of the same species winged, and others 

 wingless. These instances may sometimes mislead 

 a beginning entomologist; but he will very soon 

 learn to distinguish the real tribe to which the 

 insect belongs, and will not hastily refer it to the 

 Aptera. 



