342 



GENERAL BIOLOGY 

 TOUCH 



The sense of touch is probably developed very highly in most in- 

 sects as there are sensory tactile hairs over the entire body, as well as 

 antennae, palpi and cerci which are especially developed tactile organs. 



Fig. 224. 



A. The common cricket, Gryllus Pennsylvanicus, female. Line indicates 

 natural size. 



B. Oblong leaf-winged Katydid, Amblycorypha oblongifolia, female. (From 

 Kellogg's "American Insects," by permission of Henry Holt & Co.) 



TASTE 



The sense of taste is located in the sensory hairs or microscopic 

 elevation borne upon the tongue or hypopharynx, on the epipharynx 

 (which lies on the roof of the pharynx), something like the palate in 

 higher animals, and on the maxillary and labial palpi. From the experi- 

 ments so far performed it seems insects can detect tastes that man can- 

 not. 



SMELL 



Insects may depend upon the sense of smell to find their food more 

 than upon sight, but the usual experiments to demonstrate this are far 

 from satisfactory. The cutting away of antennae with the attendant 

 tearing of many tiny nerves, will certainly not cause any organism to 

 react normally. 



Mclndoo has recently shown that the chief olfactory organs (at 

 least in the honey-bee) are located near, or on the base of the leg. 



