xii ILLUSTRATIONS. 
PACK 
Carnivorous Beetles, Dyticus marginalis, and the whirligig 
beetles 257 
Daddy-long-legs, showing the balancers ..... 262 
Common Gnat, grub, pupa, insect emerging and gnat on the 
wing 264 
The Hill Ant, Formica rtifa, and House Ant, Myrmica molesta, 
and their structure 271 
Ant's Head and Foot, showing the mouth-parts and the leg-combs 273 
Section of an Ants' nest, from Figuier 279 
Cleared disk of the agricultural ant's nest .... 295 
