546 



THE STUDY OF INSECTS. 



ruined at the outset. The appearance of these insects 

 when in the ground, as seen through the glass side of one 



of our root- 

 cage s, is 

 shown in 

 Fig. 657. 



The re 

 is a vast 



number of species of click- 

 beetles ; more than five hun- 



FIG. 658. Larva of Cryptohypnus abbre- 

 : a, clypeus; fi, mandible; c, 

 maxilla ; d, gula; e, caudal segment. 



FIG. 659. Larva of Drasterius clcgans : 

 a, clypeus ; />, mandible ; c\ maxilla ; </, 

 gula ; e, caudal segment. 



have been described 



FIG. 657 A corn-plant growing in a root- 

 cage infested by wire-worms and click- 

 beetles (from a specimen in the Cornell 

 Insectary). The spotted beetle represented 

 near the base of the plant is Drasterius 



elegans ; that near the top of the plant is f rom North America 

 Agriotes mane us. 



It is quite difficult to sep- 

 arate the closely-allied species, as there is but little variation 

 in shape and color. The larvae also show comparatively 



