244 FLASH LIGHTS ON NATURE 



hall-dress. As the pupa grows older, the skin 

 or ca^e >tands off of itself from the animal within, 

 by a sort of strange internal shrinkage, and a 

 layer of air is thus formed between ca>e and 



NO. 7. THE FEMALE MOSQUITO ABANDONING HER PUPA CASE. 



occupant. This causes the whole apparatus to 

 float to the surface, and enables the winged fly 

 to make an effective exit. The new mosquito, 

 looking still very hump -backed, and distinctly 

 crouching, breaks through the top of the pupa- 



