38 MEMBERS OF INSECTS. 



ears would be found to arise like the wings, from the 

 junction of the upper flanks with the back or rather 

 crown plates. 



The ears are composed of minute cylinders or rings 

 successively added to each other, to the number of 

 thirty in some butterflies; and thus forming a tube, 

 which encloses nerves for sensations and muscles for 

 moving, as well as air-pipes and cells. 



As to their insertion or connexion, they are always, 

 according to M. Audouin, placed near the eyes, be- 

 fore, behind, above, below, between, or even appa- 

 rently within these. Sometimes their bases are near 

 together, or united, and sometimes considerably dis- 

 tant. 



As to their direction, they are stiff or flexible, 

 straight or nodding, parallel or diverging, spiral or 

 not spiral; and they are in some species carried 

 always forward, in others backward, or towards the 

 sides, and sometimes folded up or drawn into a sheath. 



Various forms of the ears. 



