ii6 The Life-History of Insects 



the insects which undergo it are said to be hemimeta- 

 bolous. On the other hand the insect, during the stage 

 before the imago, may be passive, resting for the most 

 part in one position and taking no food, as in Moths, 

 Flies, Beetles (fig. 6^), and Bees. The insect in this 

 resting-stage is known as a pupa, differing markedly 

 in its form both from the larva whence it has grown 



Fig. 74. — a. Nymph (4th stage) of Cicad, magnified 5 times ; c. 

 front leg, inner face ; li. outer face, magnified 75 times ; b. 

 teeth on thigh, more highly magnified. From Marlatt, Bull. 

 14 (n.s.) Div. Ent. U.S. Dept. Agr. 



and from the imago to which it will turn. Insects 

 which pass through a resting pupal stage are said to 

 be holometaboloiis , or to undergo a complete metamorphosis. 

 To a great extent, however, various stages in the 

 degree of metamorphosis can be traced. As previously 

 mentioned, a Cockroach or a Grasshopper, when newly 

 hatched, is a nymph, resembling closely the perfect 



