37 
organ of sense adapted to them." 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, Prionocyphon : d, Acneus; 
e. Dendroides: /. Dineutes; g, 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 developed 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 species, and when we consider that the members of a colony 
number at times, not thousands, but hundreds of thousands, this 
remarkable power will be fully appreciated. 
