Question
Differentiate between Blatta orientalis (oriental cockroach) and Periplanata americana (American cockroach).
| S. No. | Blatta orientalis | Periplanata americana |
| 1. | Brownish-black to black coloured. | Shining brown-coloured. |
| 2. | 20-25 mm, smaller in size. | 35-40 mm, larger in size. |
| 3. | Less capable of flying. | Good capacity of flying. |
| 4. | Forewings are vestigial. Hindwings are absent. | In both sexes, both pairs of wings are well-developed. |
| 5. | Ootheca is black-coloured. | Ootheca is grey-coloured. |
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