INDEX. 



447 



Grtfllus, 231 ; on robbery among 

 Foiisfes, 286 



Si^ht, how far ants are guided by, 

 251, 258, 266, 270 



Signals given by ants, 158 



Slave-holding, structural changes 

 induced by, 82; degradation 

 caused by, 89 



Slave-making ants, 18 ; expedition 

 of, 81 



Slavery among ants, origin of, 79 ; 

 degrading tendency of, 82-89 



Smell of Myrmecina possibly pro- 

 tective, 17 ; on recognition 

 among ants by, 127 ; sense of, 

 among ants, 233 ; the probable 

 means of recognition among 

 bees, 281 ; sense of, keen among 

 bees, 288 



Snake killed by Driver ants, 64 



Soldiers among ants, 20 ; those of 

 Saiiba do not fight, 22 ; their 

 origin, 22 



Solenopsis fitgax, the eye in, 11; 

 the enemy of its hosts, 78 



Solomon on the foresight of the 

 ant, 59, 60 



Sound, apparent insensibility of 

 ants to, 222 ; possible existence 

 of, beyond human auditory 

 range, 223, 233 ; how produced 

 by Mutilla, 229 ; apjjarent in- 

 sensibility of bees to, 290 



Specialisation of form in flowers 

 correlated with colour, 308 



Spectrum, experiments as to per- 

 ception of, by ants, 198 



Spiders, tbeir intelligence in es- 

 caping the Ecitons, 66 ; mimick- 

 ing ants, 66 



Spiracles of ant, position of, 12, 14 



Stenamma Woodwardii, the eye in, 

 1 1 ; found exclusively in nests 

 ^ of Formica, 78 



Stethoscope like organs in antenna 

 of ant, 228 



Sting in ants, possible correlation 

 of, with form of knot, 13 ; pro- 

 bable common origin of, in ants. 



bees, and wasps, 14 ; atrophied 

 condition of, in i'br»^^crt, 15; the 

 loss of, fatal to bees, 283 



Strangers, behaviour of ants to- 

 wards, 104, 109, 119, 333 



Stridulating apparatus in Mutilla, 

 229 ; in ants, 230 



Strongyhgnathus Huberi, its mode 

 of slave-making, 84 



— testacens, the eye in, 11; slave- 

 holders in spite of their feeble- 

 ness, 84 ; their degradation, 87, 

 89 



Sulphate of quinine, experiment 

 with, as to ant vision, 216 



Surgical use of ant heads in Bra- 

 zil, 96 



Sykes, Mr., quoted as to seed- 

 collecting ants, 60 



rpAME wasp, behaviour of a, 315 

 JL Tapiiwma, length of period of 



larval life in, 7 

 — erratieuin, the eye in, 11 ; their 



agility, 24; Heteerius in nests 



of, 77 

 Teazle, possible uses of leaf-cup 



in, 52 

 Tetramoriuni ccpsjntmn, the eye in, 



11 ; feigns death as a defence, 



17; alleged greediness of, 27; 



enslaved by Strong ylognathus, 



84 ; entire dependence of Ajier- 



gates upon, 85 

 Texas, harvesting ants in, 61 

 Thiasnjjlnla angiilata in ants' nests, 



77 

 Thorax of ant described, 12 

 Tibia of Gryllus, sense organ in, 



231; of Lasins, 232 ; of Locus- 

 tides, 233 

 Tomognatlius sublesvis , only 



workers of, known, 87 note 

 Tracks of ante illustrated, 251-257 

 Tuning-forks, experiments with, 



222 

 Tunnels formed by ants, 25 

 Tyndall, Professor, experiment 



