INDEX. 



-129 



FOB 



determining the sex in ants and 

 bees, 40 ; individual ants in 

 certain species serve as recep- 

 tacles of, 48 



Foragers, certain ants of a nest 

 told off as, 45, 48 



Forel, Dr., referred to as to the 

 emergence of pupfe of ants, 8 ; 

 as to their compound eyes, 10 ; 

 as to the position of spiracles, 

 14 ; as to offices of young ants, 

 2.^ ; as to P. rufa, 27 ; as to 

 ant-games, 28, 29 ; as to origin 

 of nests, 31 ; as to eggs laid by 

 workers, 35; on the honey ant, 

 40 ; on the germination of grain 

 in ant-storcs, 61 ; as to beetles 

 in ant nests, 78 ; as to slaves of 

 F. swngviiua, 80,398 ; astoslave- 

 naking of Stronqyli)gnatkii», 85 ; 

 an Anergatcs, 86 ; on behaviour 

 3f ants to each other, 94 ; on 

 recognition among ants, 120, 

 411 ; as to power of commu- 

 nication among ants, 158 : as 

 to thel" insensibility to sound, 

 221 ; as to special organs in an- 

 tennas, 227 ; as to their sensi- 

 tiveness to light, 405; on the 

 use of the ocelli, 408 



Formica inspinosa, its nest, 24 



— einerea, 16; character of, 27; 

 eggs laid by workers among, 37, 

 39 ; duration of life of, 42 



— coni/ereJis, Thiasojjhila in nests 

 of, 77 



— exsecta, mode jf attack of, 17 ; 

 extent of nest of, 24 ; Thiaso- 

 phila in nests if, 77 



— Jiara, Uropadi' in nests of, 393 



— fusfa, occasi-'/nnlly spins a 

 cocoon, 7 ; its timidity, 27 ; in- 

 troduction of a queen among, 

 34 ; eggs laii 1 ijy workers among, 

 38, 39 ; queens produced in 

 captivity, 40 ; longevity of, 42, 

 415; division of labour among, 

 45 ; occasionally found in the 

 nests of I\ rv/a, 79 ; enslaved 



FOB 



by F". sanguinea, 80 ; Platy- 

 arthrus recf-ived in nests of. 90 ; 

 their conrtition analogous to 

 that of the hunting races of 

 men, 91 ; ttieir neglect of friends 

 in trouble, 96 ; expulsion of a 

 member trom the nest, 98; mite 

 attached to the head of a queen 

 of, 98 ; neglect of imprisoned 

 companions, 103 ; hostility 

 towards imprisoned strangers, 

 104 ; instances of their kind- 

 ness to crippled companions, 

 106 : experiments as to recog- 

 nition among, 122, 130, 134, 233; 

 on power of communication 

 among, 1 6 1 , 1 80 ; as to percept ion 

 of colour among, 188, 193, 201 

 F(» idea gagates enslaved by F, 

 cO/itguinea, 80 



— bigniperda, experiments as to 

 sense of hearing among, 223 ; as 

 to sense of smell among, 234 



— nigra, experiment as to power 

 of communication among, 359 



— 'pratensis, eye of, 10, 1 84 ; at- 

 tacked by F. exsecta, 18; its 

 treatment of slain enemies, 27; 

 Stenavima in nests of, 78 ; large 

 communities of, 119 



— rufa, its power of ejecting poi- 

 son, 15 ; its mode of attack, 17, 

 27 ; nests of, 23 ; large number 

 of insects kept in nests of, 74, 

 75 ; Stenavima in nests of, 78 



— rufiharbis perhaps a variety of 

 F. fugca, 80 



— sanguinea, its mode of attack, 

 17 ; duration of life of, 41, 42 ; 

 Dinarda in nests of, 77 : their 

 periodical atta<*k on neighbour- 

 ing nests, 79 , slaves made by, 

 80 ; not yet degraded by slave- 

 holding, 88 ; they apparently 

 understand the signals of Pra- 

 tensis, 159 ; and its slaves, 398 



FormicidcB, one of the three fami- 

 lies of ants, 1 ; power of sting- 

 ing absent in them, 13 



