INDEX. 



Agenia architecta, date of appearance of, 165; short larval life of, 166. 



BOMBYCiNA, observation on ruutilation of spider by, 164; Dimmock's 



account of habits of, 165. 



Ammophila, variations among species of, in method of closing nest, 20; 

 Fabre's conclusions from the study of, contrasted with ours, 30, 31 . 



GRACILIS, great distance over which prey is carried by, 25-27; desertion 



of caterpillar by, 26; condition of caterpillar stung by, 26; failure of 

 instinct in, 27. 



HiRSUTA, method of stinging of, 12; success of experiments with, 12. 



SABULOSA, failure of experiments with, 12. 



URNARiA, feeds on nectar of flowers, 6; sense of locality in, 7, 8; locality 



study of, 212, 213; her mode of carrying caterpillar, 7, 30; prey of, 7 

 her preference for clear warm weather, 8; individual variation in, 9 

 hunting habits of, 9; her mode of attack, 10; malaxation by, 11, 12 

 stinging habits of, 11, 12; failure in experimenting with, 12; variation 

 in the thoroughness of her stinging, 13; condition of caterpillars stung 

 by, 13-18; length of time that caterpillars survive the sting of, 13; 

 length of egg and larval stages in, 18; locality and character of her 

 nest, 18; position of her egg on larva, 18; her method of digging, 19; 

 her method of making a temporary closure of nest, 19; time elapsing 

 between storing of her caterpillars, 21; final closure of her nest, 21; 

 her habit of frequently revisiting nest, 21; variation in her manner of 

 closing nest, 21, 22; using pebble as a tool, 23; her peculiar conduct 

 resulting in loss of egg, 27; number of caterpillars stored by, 28. 



YARROWi, Williston's notes on habits of, 23-25. 



Aporus fasciatus, goes backward when carrying prey, 55; depends upon 

 land-marks for recognizing locality, 55; her method of digging, 56; 

 position of her egg on spider, 56; length of egg stage in, 56; does not 

 sting severely, 56; probably depends upon close packing to keep spider 

 quiet, 56; contrast between two individuals of, 57; length of time occu- 

 pied by, in digging nest, 56, 57; character of nest of, 57; takes Atti- 

 dae, 57; her habit of filling up partly made nests, 57; date of appear- 

 ance of, 57. 

 Arachnida, concentration of nervous system in, 81. 



