28 



ZOOLOGY 



biting. Tho lare;est representative of this group is the 

 Horned Corydalis (Fig. 29), whose larva lives in streams 

 and is called the dobson. The adult is found among fallen 

 leaves or on tree-trunks. 



The ant-lions are of interest because of the peculiar habits 

 of the larvae, which live in sheltered sandy places and make 



Fk;. .30. — Life history of ant-lion. Larva in their pits; one on surface at 

 risiht ; liall containing pupa in centre ; adult at left. From Bailey-Coleman, 

 " Biology." 



funnel-shaped pits a few centimetres in diameter. The sides 

 of the pit are so .steep that if an ant by accident falls into 

 it and attemjits to emerge, it will slide down to the bottom 

 with the rolling sand. The larva lying in wait buried in the 

 sand at the bottom, quickly protrudes its jaws and grasps its 

 luckless prey (Fig. 30). 



