HOW TO KNOW THE IMMATURE INSECTS 

 The following form is recommendated for recording the life history: 



Fig. ^45. Life history recording form. 



For recording the following abbreviations can be used: 



E for egg; L for larva; N for nymph; A for adult; H for hatch; M for 



molt; P for pupa; D for died. 



PiCTURED-KEY TO ORDERS OF 

 IMMATURE INSECTS* 



la. Mouth parts of chewing type, often retracted within head; 3 pairs 

 of legs present; tarsi fre- 

 quently single-segmented 

 and usually with 2 claws; 

 wing pads never present; 

 sides ol thoracic segments 

 and sterna not divided into 

 small sclerites; abdomen 

 may possess cerci, forceps 

 or furcula and collophore. 

 Fig. 46 2 



riON TUBE 

 UTH opEH^f^d 

 P»^f5rON)AL 



rffrH 



Fig. 46. a. Mouth ports of the firebrot, 

 Thermobia domestica (Packard); b, Mouth 

 pairs of the long-nosed cattle louse, Line- 

 gnathus vituli (L.) 



• The orders and families of insects follow the some terminology in this book as that 

 used in the revised edition of "How to Know the Insects" (1947). For a phylogenetic 

 li** of these orders and families see /How to Know the Insects" pages 171-193. 



28 



