14 LIST OF ILLUSTRATIONS 



FACING PAGE 



Cocoons of ichneumon parasite of cabbage butterfly larva 76 



Male and female paper-wasps hatching in July 81 



Paper-wasp worker with unusually large pellet of paper 81 



The cannibal's nest layed open 85 



A cannibal wasp at her nest 85 



The cannibal and her diggings 86 



A complete lead model of the cannibal wasp's burrow 86 



A wasp of the sphecid's size compared to a rove beetle 88 



Sphecid wasp dragging a paralyzed cicada to her burrow 88 



Common cicada, upon which the sphecid wasp preys 88 



Comparative wing expanse of cicada and sphecid wasp 90 



Hole in cicada through which the young sphecid entered 90 



Young sphecid wasp two days old feeding on its host 90 



Queen paper wasp in the act of depositing an egg following 92 



Photomicrograph of eggs of the paper wasp following 92 



Paper wasp cells showing young and silken cocoon-caps 95 



Life size nest of paper-wasp 95 



Cells of the paper-wasp with caps removed to show young 97 



Paper wasp cells in section showing larva and pupa 99 



Epeira insularis, an orb-building spider, laying eggs 102 



A spider using a cicada's shell as a hiding place 104 



An example of spider strategy 104 



The fishing net of a hydropsychid and its maker 106 



Ants surrounding and pillaging a larger one following 108 



Brown ants transporting aphids to their underground nest . . following 108 



Actual debris gathered up after an ant battle following 108 



Carpenter ants tending their aphid "cattle" following 108 



Paralyzed and dying South American leaf-cutter ants in 



A group of dead ants all linked together in 



Carpenter ants proceeding to battle 113 



A severed head of an enemy clinging to a dead ant 113 



A train of South American army ants 113 



Leaf-cutter ants with heads and abdomens eaten away 113 



Young brown ants carefully tended by their nurses 115 



Young brown ants brought up beneath a sun-warmed stone 115 



