128 Chapter VII. 



by the striking resemblance (Mimicry) between many 

 ant-guests (Lomechusa, Atemeles, etc.) and their hosts. 

 It is primarily a resemblance of color, and only second- 

 arily a resemblance of figure, and is far more due to 

 illusive light-reflexes than to a real resemblance of 

 form. 1 



Moreover there is no doubt that many insects are 

 endowed with the sense of hearing. Even ants seem to 

 possess it. Still it is adapted only to the perception of 

 higher and finer sounds. 2 Nevertheless we have a 

 very limited knowledge of the organs of this sense in 

 ants. The olfactory sense is strongly developed in in- 

 sects. Ants possess it in a high degree. Its primary 

 organs are the feelers, whilst the variously formed 

 olfactory bulbs, smell-hollows, etc., of the palpi subserve 

 the same purpose in a secondary measure. The activity 

 of the olfactory sense of insects is much greater than 

 that of vertebrates; the more so, as, in their feelers, 3 

 insects possess even a "movable nose." The setaceous 

 'touch-bodies" of these feelers furnish, moreover, ex- 

 cellent organs of touch. Forel appropriately called the 



*) See "Die Myrmekophilen tmd Termitophilen" (Leiden, 1896), 

 p. 428 ff. ; also "Die psychischen Faehigkeiten der Ameisen" (Stuttgart, 

 1899), pp. 34-58. Mr. Lubbock has acquainted us long ago with the fact 

 that ants perceive the ultra-violet rays which are invisible to us. 



2 ) See >. Sharp in: "Transactions of the Entomol. Soc. of Lon- 

 don" (1893), P. 2, p. 199 ff.; Ch. Janet in: "Ann. Soc. Ent. France," 

 62 (1893), 159 ss.: G .Adlerz, "Stridulationsorgan och Gudfornimmelser 

 hos myror, in: Ofvers. of Kongl. Vetenskap-Akad. Forhandl" (1895), 

 n. 10; 7. Weir, "The ears of worms, crustaceans and ants," in: "Scien- 

 tific American" (April, 1898), p. 282. See also "Stimmen aus Maria- 

 Laach," 40 (1891), 214 on uttering of sounds by Myrmica ruginodis and 

 the sense of hearing of Formica rufa; besides see "Biolog. Centralblatt," 

 II. (1891), 26 and 13 (1893), 39. 



J ) See "Die Fuhler der Insecten" in "Stimmen aus Maria-Laach," 

 XL. (1891). 



