ANNUL AT A. 

 NEPHROPS. 



II.— BLATTA. 



Phylum Annulata (page 237). 



Sub-Phylum - - - - Arthropoda (page 240). 



Class - - - - - Insecta (page 246). 



The common cockroach — Blatta ( Periplaneta Orientalis) 

 — is of a dark brown colour except when young and is 

 usually about one inch in length. The American species 

 {Blatta Americana) is considerably larger and is thus pre- 

 ferable for dissection. 



The male cockroach is winged and the female has no 



wings. '^ The cockroach is found most frequently in places 



. with a high temperature, such as kitchens, 



laundries, or bake-houses, hence it is typically 



terrestrial. It is an omnivorous feeder and thrives in 



* Both sexes are winged in the case of B. Artiericana. 



