254 ANNULATA. 



The 'Cabbage White" lays its eggs on cabbages and 

 turnips which the larvae devour. A great number of the 

 night-flying moths have underground caterpillars which do 

 damage to crops. 



The relationship of Lepidoptera to flowers and the cor- 

 related structural modifications in each are full of interest. 

 In a general way, the flowers employ Lepidoptera to carry 

 pollen, and so fertilise and attract them by a supply of 

 nectar. 



Order V. — Neuroptera. 



Fig. 175.— Demoiselle Dragon Fly 



(Ag7'ion puella). 



Notice the Nervured Wings. 



The Neuroptera have biting mouth parts and two pairs 

 of membranous wings, usually of equal size and covered 

 with a network of veins. The metamorphosis is usually 

 incomplete, but in many cases is complete. 



The most important of the Neuroptera are the Dragon- 

 flies, with an incomplete metamorphosis and an aquatic 

 larva with a movable labium like a hand; the May-flies, 

 also with aquatic larvae, the fly only living a few hours ; the 

 Caddis-flies, the aquatic larvae of which protect themselves 

 in cases of twigs or stones and pass through a complete 

 metamorphosis with a pupal stage ; lastly, the Ant-lions, the 

 larval stage of which digs traps for ants. 



