KEY TO CLASSES AND ORDERS OF ANIMALS 43 



9(8) Mouth parts not formed for biting. 10 



10(11) Body inclosed in the old body skin (puparium) and 

 always associated with birds, mammals, or honey bees. 

 (Lutz, 229; Comstock, 413.) 



Order Diptera, in part 



11(10) Body not inclosed in the old body skin; appendages 

 fused to the integument of the rounded body. (Lutz, 

 115; Comstock, 181.) Order Lepidoptera, in part 



12(1, 19) With one pair of wings or wing rudiments. 13 



13(14) Mouth parts absent; fore legs extending forward 

 beneath the head; body covered with waxy scale or 

 inclosed in the old skin of previous molts or both. 

 (Lutz, 91; Comstock, 164.) 



Order Hemiptera, males of the Coccidae 



14(13) Mouth parts present; fore legs not extending forward 

 under the head. 15 



15(16) Head prolonged into an immovable beak bearing the 

 antennae at the sides. (Lutz, 393; Comstock, 590.) 



Order Coleoptera, Rhyncophora in part 



16(15) Head not prolonged into an immovable beak. 17 



17(18) Pro thorax distinct, mouth parts formed for biting. 

 (Comstock, 494; Lutz, 280.) 



Order Coleoptera, in part 



18(17) Prothorax not distinct, its posterior boundary never 

 more than a slight groove on the dorsal surface; 

 mouth parts not formed for biting (appeiidages may 

 be fused to the integument of the body, or the pupa 

 may be inclosed in the old larval skin (puparium). 

 (Comstock, 413; Lutz, 229.) 



Order Diptera, in part 



19(1,12) With two pairs of wings or wing rudiments which when 

 fused to the body are distinguishable by slight projec- 

 tions where they join the body. 20 



