58 Bulletin de la Société Entomologique (VEgyyle 



very short munit after the nymphal stage to free the 

 wings from their sheaths and sometimes i or y extra 



r 



Fig. 1. Periplane fa america iia : Male, 6 mm. long, 2 or 3 

 days old. In Canada balsam x 15.5. 



antenna! joints are formed .In such cases the division 



o! the third joint takes place before the second moult. 



The antennae of cockroaches differ from those 



