OBNOXIOUS INVERTEBRATES. 353 



in the nostrils of those who sleep out ; these eggs pro- 

 FIG. 314. 



METAMORPHOSES OF COMMON FLEA (Pulex irritaw) (magnified). a, larva ; 6, 

 pupa or nymph : c, perfect insect. 



FIG. 315. 



FIG. 316. 



MOUTH APPARATUS OF THE FLEA. The BEDBUG (Cimex lecttUaria), 



long serrated mandibles are on each magnified, 



side of a median needle which rep- 

 resents the labrum. Exterior to these 

 mandibles, two grooved joints rep- 

 resent the lower lip. The maxillary 

 palps are still further out. 



duce carnivorous larvae that penetrate profoundly, and 

 occasion terrible suffering and frequently death. 

 x 30* 



