ANATOMY OF INSECTS- -INTERNAL 



IT 



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Touch. The sense of touch is very highly developed in many 

 insects, sensory tactile hairs commonly occurring over the whole 

 body, and the antennae, palpi, and 

 cerci being specially developed as 

 tactile organs. 



Taste. Both observation and 

 experiment have shown that in- 

 sects have a \vell-developed sense 

 of taste, though it is often quite 

 different from that of man, as 

 they detect some substances but 



FIG. 47. Tip of tongue of honey-bee 

 Showing labellum (Ll>I), guard hairs (//>')> 



below. (After Snodgrass, United States 

 Department of Agriculture) 



r -i ,1 j r, onowmg lauenum i L^VL i, yuciiu iicuia \j.j.r.i. 



fail to perceive others, and often and ve * tral groov v e (jfe)> from above and 



seem to relish substances wholly 



repugnant to us. The sense of 



taste is located in sensory hairs or microscopic pegs borne upon 



the tongue (see Fig. 47), or hypopharynx, on the epipharynx (a 



a 



FIG. 48. Nerve endings in tip of maxillary palpus of (a) Locusta viridissima, 

 and in labial palpus of (b) Machilis polypoda. (Greatly magnified) 



s/i, sense hairs ; sc, sense cells ; be, bfood cells. (After Vom Rath, from Kellogg) 



sensory portion of the roof of the pharynx similar to the palate of 

 higher animals), and on the maxillary and labial palpi. Probably the 

 sense of smell is used more than the taste organs in choosing food. 



