ON PETROLEUM AND I'HOTOGEM. 



41 



insects taken out of the wax is represented in fig. 4. This is its dorsal 

 surface. Fig. 5 is a representation of the abdominal surface of the same 

 insect. 



Fig. 1. Fig. 2. Fig. 3. 



It will be seen that it has six legs, and the body is full of wax. The 

 white ii laments and minute oval bodies with which the cochineal insect 

 is surrounded present nearly the same structure as the insect wax. They 

 are represented in fig. 3. 



Fig. 4. 



Fig. 5. 



Dr. Martius, commenting on the same subject, says — In Mr. 

 Hanbury's paper it is mentioned that Flata limbata has beeu assumed to 

 be the insect producing pe-la ; but, according to Burmeiston (' Handbuch 

 der Entomologie,' II., p. 466), this insect only inhabits Western Africa. 

 Besides Cicada limbata, Donovan (Flata nigricornis, Fabr.) is a native of 

 China, and its caterpillar is stated to live on StilUngia sehifera, to be 

 entirely covered with a white down, which remains on the leaves, and 

 which, when melted, forms the pe-la. In the late edition of Pereira's 



VOL. IV. E 



