INDEX, 



441 



FOR 



determining the sex in ants and 

 bees, 40 ; individual ants in 

 certain species serve as recep- 

 tacles of, 47 



Foragers, certain ants of a nest 

 told off as, 45, 47 



Forel, Dr., referred to as to the 

 emergence of pupae of ants, 8 ; 

 as to their compound eyes, 10; 

 as to the position of spiracles, 

 14 ; as to the offices of young 

 ants, 23 ; as to F. ritfa, 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 germina- 

 tion of grain in ant-stores, 61 ; 

 as to beetles in ant nests, 78 ; 

 as to the slaves of F. sajiguinea, 

 80 ; as to the slave-making of 

 Strongylognathus, 85 ; on Aner- 

 gates, 86 ; on the behaviour of 

 ants to each other, 94 ; on re- 

 cognition among ants, 120; as 

 to power of communication 

 among ants, 158 ; as to their 

 insensibibility to sound, 221 ; as 

 to special organs in their an- 

 tenna, 227 



Formica bisjnnosa, its nest, 24 



— cinerea, 16 ; character of, 27 ; 

 eygs laid by workers among, 37, 

 39 ; duration of life of, 42 ' 



— conqcfeiis, Thiaso])Mla in nests 

 of, 77 



— exseeta, mode of attack of, 17 ; 

 extent of nest of, 24 ; Thiaso- 

 pliila in nests of, 77 



— flava, Uropoda in nests of, 431 

 — fusca. occasionally spins a 



cocoon, 7; its timidity, 27 ; in- 

 troduction of a queen among, 

 34 ; eggs laid by ' workers 

 among, 38, 39 ; queens produced 

 in captivity, 40; longevity of, 

 42 ; division of labour among, 

 45 ; occasionally found in the 

 nests of F. ritfa, 79 ; enslaved 

 by F. sanguinea, 80 ; Pkifij- 



FOR 



aHhrus received in nests of, 90 ; 

 their condition analogous to 

 that of the hunting races of 

 men, 91 ; their neglect of friends 

 in trouble, 96 ; expulsion of a 

 member from the nest, 98 ; mite 

 attached to the head of a queen 

 of, 98 ; their neglect of im- 

 prisoned companions, 103 ; hos- 

 tility towards imprisoned 

 strangers, 104 ; instances of 

 their kindness to crippled com- 

 panions, 106; experiments as 

 to recognition among, 122, 130, 

 134, 233; on' power of commu- 

 nication among, 161, 180; as to 

 perception of colour among, 188, 

 193, 201 

 Formica gagates enslaved by F. 

 sangmnea, 80 



— ligniperda, experiments as to 

 sense of hearing among, 223 ; as 

 to sense of smell among, 234 



— nigra, experiment as to power 

 of communication among, 363 



— pratensi-i, eye of, 10, 184 ; at- 

 tacked by F. exseeta, 18 ; its 

 treatment of slain enemies, 27 ; 

 Stenamma in nests of, 78 ; large 

 communities of, 119 



— ri/fa, 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 ; Stenamma in nests of, 78 



— rufibarbis perhaps a variety of 

 F. fusca, 80 



— sanguinea, its mode of attack, 

 17 ; duration of life of, 41, 42 ; 

 Dinarda in nests of, 77 ; their 

 periodical attack 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 



Formicidtf, one of the three fami- 

 lies of ants, 1 ; power of sting- 

 ing absent in them, 13 



