pean 77. hcrtu* L. and our own H. behmixi Stretch. The 

 possession of odoriferous glands, in other words, implies the 

 possession of olfactory organs. Yet there is among insects no 

 one specialized olfactory organ as among vertebrates; for while 

 there is conclusive proof that this sense rests in the antenna? 

 with many insects, especially among Lepidoptera, there is good 

 evidence that in some Hymenoptera it is localized in an ampulla 

 at the base of the tongue, while Graber gives reasons for believ 

 ing that in certain Orthoptera (Blattidae) it is located in the anal 

 cerci, and the palpi. 



FIG. 9. SENSORY ORGANS IN INSECTS : A, sensory pits on antennae of" young wing 

 less Aphis persicce-niger (after Smith) ; 7>, organ of smell in May Beetle (after Hauser) ; 

 C, organ of smell in Vespa (after Hauser) ; D, sensory organs of TermesJIavipes, , tibial 

 auditory organ, c, enlargement of same, 6, sensory pits of tarsus (after Stokes); K, organ 

 of taste in maxillae of Vespa vulgaris (after Will) ; F, organ of taste in labium of same 

 insect (after Will); G, organ of smell in Caloptenus (after Hauser); //, sensory pilose de 

 pressions on tibia of Termes (after Stokes) ; /, terminal portion of antennae of Myrmica 

 ruginodis, c, cork shaped organs, s, outer sac, /, tube, w, posterior chamber (after Lub- 

 bock) ; K, longitudinal section through portion of flagellum of antennae of worker bee, 

 showing sensory hairs and supposed olfactory organs (after Cheshire). All very greatly 

 enlarged. 



HEARING. In regard to the sense of hearing the most casual 

 experimentation will show (and general experience confirms it) 

 that most insects, while keenly alive to the slightest movements 



