34 SYNOPTIC KEY 



Class INSECT A 



NYMPHS AND WINGLESS ADULTS 



Tentative key to orders of nymphs of insects with incomplete 

 metamorphosis and to a few adults that are wingless or have rudi- 

 mentary wings: modified from Comstock and from Needham. 



1(35) Forms not aquatic. 2 



2(3, 25) Mouth parts retracted within the head so that only 

 their apices are visible. Adults and young. (Lutz, 

 39; Comstock, 82.) Order Thysanura 



T,(2, 25) Mouth parts more or less prominent and fitted for 

 biting. 4 



4(5) Head prolonged into a trunklike beak; antennae 

 borne near the eyes. Adults in part. (Comstock, 

 184; Lutz, 56.) Order Mecoptera 



5(4) Head not prolonged into a trunklike beak. 6 



6(9) Louselike insects of very small size. 7 



7(8) Antennae not more than five segments; ectoparasitic 

 forms, bird lice. Adults and nymphs. (Comstock, 

 100; Lutz, 78.) Order Mallophaga 



8(7) Antennae with many segments. Adults in part 

 and nymphs. (Comstock, 98; Lutz, 76.) 



Order Corrodentia 



9(6) Insects of various forms but not louselike. 10 



10(13) Abdomen with short, conical, compressed, many- 

 jointed caudal appendages, or unjointed caudal append- 

 ages in the form of forceps. 11 



11(12) Caudal appendages jointed. Cockroaches, adults, 

 and nymphs. (Lutz, 62; Comstock, 104.) 



Order Orthoptera 



