KEY TO CLASSES AND ORDERS OF ANIMALS 35 



12(11) Caudal appendages in the form of unjointed forceps. 

 (Comstock, 102; Lutz, 61.) 



Euplexoptera or Dermaptera 



13(10) Abdomen without jointed caudal appendages. 14 



14(15) Legs fitted for jumping. Adults and nymphs in part. 

 (Comstock, 104; Lutz, 62.) Order Orthoptera 



15(14) Legs fitted for running. 16 



16(24) Abdomen broadly joined to the thorax. 17 



17(18, 23) Body elongate, linear. Adults and nymphs in part. 

 (Comstock, 104; Lutz, 62.) Order Orthoptera 



18(17, 23) Body whitish and somewhat antlike in form. Animals 

 living in colonies. (Lutz, 76; Comstock, 95.) 



Order Isoptera 19 



19(20) Head much elongated bearing a pair of heavy man- 

 dibles. Soldiers of Isoptera. 



20(19) Head not elongated. 21 



21(22) Animals about the size of the soldiers of Isoptera. 

 Workers of Isoptera. 



22(21) Much smaller than the soldiers. Isoptera nymphs 

 capable of developing into many of the castes. 



23(17, 18) Body neither linear nor anthke in form. Adults in 

 part. Wingless fireflies, etc. (Lutz, 280; Comstock, 

 494.) Order Coleoptera 



24(16) Base of abdomen strongly constricted. Ants, et al. 

 (Lutz, 406; Comstock,. 599.) Order Hymenoptera 



25(2, 3) Mouth parts formed for sucking. 26 



26(27, 28) Small insects of peculiar form in which the body is 

 either scalelike or gall-like in form, or grublike and 

 clothed with wax. The waxy covering may be in the 



