37 



organ of sense adapted to tliem." It is quite certain that ants do make 

 sounds, and the sound-producing organs on some of the abdominal 

 joints have been carefully described. The fact that so many insects 

 have the power of producing sounds that are even audible to us is the 

 best evidence that they possess auditory organs. These are, however, 

 never vocal, but are situated upon various parts of the body or upon 

 different members thereof. 



Special Sense and Sense Organs. — While from what has preceded it is 

 somewhat difficult to compare the more obvious senses possessed by 

 insects with our own, except perhaps in the sense of touch, it is, 

 I repeat, just as obvious to the careful student of insect life that they 

 possess special senses which it is difficult for us to comprehend. The 



Fig. 12.— Some Antenna OF COLEOPTERA: a, Ludius; b, Corymbites; c, Prionocyphoii; d, Acneus; 

 f, Deudroirtes: /, Dineutes; (jr, Lachnosterna ; h, Bolbocerus; i, Adranes (after LeConte and Horn). — 

 All greatly enlarged. 



sense of direction, for instance, is very marked in the social Hymen- 

 optera which we have been considering, and in this respect insects 

 remind us of many of the lower vertebrates which have this sense much 

 more strongly develoiied than we have. Indeed, they manifest more 

 especially what has been referred to in man as a sixth sense, viz, a 

 certain intuition which is essentially psychical, and which undoubtedly 

 serves and acts to the advantage of the species as fully, perhaps, as 

 any of the other senses. Lubbock demonstrated that an ant will recog- 

 nize one of its own colony from among the individuals of another colony 

 of the same si^ecies, and when we consider that the members of a colony 

 iinmber at times, not thousands, but hundreds of thousands, this 

 remarkable power will be fully appreciated. 



