PART I.--HARVESTING ANTS.

Ælian on harvesting ants, 7-9.

Aldrovandus, radicle of seed gnawed by ants, 9.

Algiers, harvesters observed in, 52.

Aphides and cocci not sought by harvesting ants, 48.

Atta _barbara_, 15, &c.; _barbara_ var., 16, 31, 63; _barbata_, 12; _cephalotes_, 13; _diffusa_, 12 (note), 65; _megacephala_, 16, working at night, 49; _providens_, 12 (note), 65; _rufa_, 12 (note), 64; _structor_, 16, 29, 63, working at night, 49.

Battles of ants between different colonies of the same species, 37, 40; with caterpillar, 41.

Capri, harvesting ants at, 68.

Captive ants, 42-49.

Crematogaster _scutellaris_, 62; _sordidulus_, 63.

Dispersal of seeds by means of ants, 4, 21, 53, 55.

Distribution of harvesting ants, 52, 57, 59.

Enemies of the ants, 56.

Formica _cruentata_, 37, 61; _cursor_, 62; _emarginata_, 61, working at night, 49; _erratica_, 37, 62; _fusca_, 51, 61; _marginata_, 62; _nigra_, 5 (note); _nigerrima_, 52; _viatica_, 52.

Galls found in ants' nests, 36.

Germination of seeds arrested by ants, 20, 25, 26, 40; this fact mentioned by Aldrovandus, 9.

Granaries, structure of, 22, 23, 31, 32, 49, 54; position of, 31; contents of, 27; time required to construct, 45.

Insects inhabiting ants' nests, 35, 36, 56.

Jerdon (Dr.) on harvesting ants in India, 12, 64, 65.

Kirby and Spence, assertion that ants do not harvest in Europe, 10.

Mistakes made by ants, 19, 37.

Mouth organs of ants, 48.

Myrmica _cæspitum_, 37, 51, 63.

Occasional harvesters, 51.

Œcodoma _cephalotes_, 13; _diffusa_, 12 (note), 65; _providens_, 12 (note), 65.

Pheidole _megacephala_, 16, 50, 63, working at night, 49; _pallidula_, 51, 63.

Pseudomyrma _rufo-nigra_, 67.

Radicle of germinating seeds gnawed off by ants, 20, 25, 26; this fact mentioned by Aldrovandus, 9.

Rock nest, sandstone mined by ants, 32-35.

Rubbish heaps, materials which compose, 21, 22, 55.

Sandstone mined by ants, the rock nests, 31-35.

Seeds, dispersal of, by means of ants, 4, 21, 53, 55; tendency to germinate arrested, 24, 50; eaten by ants, 46-48, 54.

Seed stores of ants used as food by natives of India, 67.

Spherical chamber found in ant's nest, 35.

Sykes (Lieut.-Col.) and Jerdon (Dr.) on harvesting ants in India, 12, 64, 65.

Winged males and females of Aph. _Structor_ and _Barbara_, 41.