THE CHARACTERS AXD METAMORPHOSES OF INSECTS. 



within which the transformations are undergone. This case is 

 l termed a cocoon. Frequently these 

 cocoons are made within a rolled 

 7), or on the surface of 

 the ground, where they are covered 

 with c! or other rubbish. 



Certain hairy caterpillars make - 

 their cocoons largely of their hair,^' 

 which they fasten together by a 

 thin film of silk. 



Immature Forms of Insects ii<itJi Incomplete Metamorphosis, TJie 

 Nymph. The terms larva and pupa are applicable only to the early 



FIG. 7. Cocoon of Telia. 



FIG. 8. Nymph of Melanofilu*, first stage. 

 (After Kmcrion.) 



Fie. 9. Nymph of Melanoflus. second stage. 

 (After Emerton.) 



stages of insects with a complete metamorphosis. In the case of 

 those in which the transformation is an incomplete one, the char 

 through which the immature insect passes after leaving the egg are 



h of Mrl,inof<lif\, third stage. 

 (After Emerton.) 



; Nymph of Me!an0f>l*s t fourth stajje. 



(After Em< i 



radual that one cannot indicate any point at which tin ii 

 !>< a larva and >npa. Recent writers have i. 



tin nil nymph (.1 term formerly used as a synonym of 



pupa)tode< the immatun with an incomplete 



imorpho*: . Tin : :>plicd to all tin the 



egg and the fully winged or adul' 



A nymph when it leaves the egg has no indications of v, 



- number of moults, differing in 

 different sp iall prolongations appear projecting from the 



