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. 



There 

 is a vast 



number of species of click- 

 beetles; more than five hun> 



FIG. 658. Larva of Cryftohypnus abbre 

 mat us : a, clypeus; 6, mandible; c 

 maxilla; d, gula; e, caudal segment. 



FIG. 659. Larva of Drasterius elegans : 

 a, clypeus; l>, mandible ; c. maxilla; d, 

 FIG. 6S7.-A corn-plant growing in a root- ula yp ca ' ud ' al seKme nt. 

 cage infested by wire-worms and click- 

 beetles (from a specimen in the Cornell 



Insectary). The spotted beetle represented dred haVC been described 

 near the base of the plant is Drasterius 



elegans ; that near the top of the plant is f ror n North America alOHC. 

 Agriotes ma ncus. 



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 



