20 



INSECT ARCHITECTURE. 



When an insect first issues fi-om the egg, it is called 

 by naturalists larva, and, popularly, a caterpillar, a 

 grub, or a maggot. The distinction, in popular lan- 

 guage, seems to be, that caterpillars are produced 

 from the eggs of moths or butterflies; grubs, fi-om 

 the eggs of beetles, bees, wasps, &c. ; and maggots 

 (which are without feet) from blow-flies, house-flies, 

 cheese-flies, &c., though this is not very rigidly ad- 

 hered to in common parlance. Maggots are also 

 sometimes called worms, as in the instance of the 

 meal-worm; but the common earth-worm is not a 

 larva, nor is it by modern naturalists ranked among 

 insects. 



Larvae are remarkably small at first, but grow 

 rapidly The full-grown caterpillar of the goat-moth 

 {Cossus ligniperda) is thus seventy-two thousand 

 times heavier than when it issues from the egg; and 



Larva, Grubs, Caterpillars, or Maggots 



