INDEX, 
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 pupz of ants, 8 ;. 
as to their compound eyes, 10; 
as to the position of spiracles, 
14; as to the offices of young 
ants; 23; asto F. 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 germina- 
tion of grain in ant-stores, 61; 
as to beetles in ant nests, 78; 
as to the slaves of F. sanguinea, 
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- 
tennzx, 227 
Formica bispinosa, its nest, 24: 
— cinerea, 16; character of, 27; 
evgs laid by workers among, 37, 
39; duration of life of, 42 
— congerens, Thiasophila in nests 
of, 17 
— exsecta, mode of attack of, 17; 
extent of nest of, 24; Thiaso- 
phila 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;  ezgs 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. rufa, 79; enslaved 
by FL sanguinea, 80; Platy- 
441 
FOR 
arthrus 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 ot 
their kindness to crippled com- 
panions, 106; experiments as 
to recognition among, 122, 130, 
134, 233; on power of commu- 
nication among, 16], 180; as to 
perception of colour among, 188, 
193, 201 
Formica gagates enslaved by F. 
sanguinea, 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 
— pratensis, eye of, 10, 184; at- 
tacked by F. exsecta, 18; its 
treatment of slain enemies, 27 ; 
Stenamma 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; Stenamma in nests of, 78 
— rufibarbis perhaps a variety of 
Ff. 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 
Formicidae, one of the three fami- 
lies of ants, 1; power of sting. 
ing absent in them, 13 
