36 SYNOPTIC KEY 



form of a powder, or of large tufts or plates, or of a 

 continuous layer, or of a thin scale, beneath which the 

 insect lives. Coccidae, females and nymphs in part. 

 (Lutz, 91; Comstock, 121.) Order Hemiptera 



27(26, 28) Body more or less covered with minute scales, or with 

 thick long hairs; prothorax not free, i.e., closely united 

 with the mesothorax; mouth parts usually consisting 

 of a long "tongue" rolled under the head; adults in 

 part. (Lutz, 115; Comstock, 191.) 



Order Lepidoptera 



28(26, 27) Body naked or with isolated or bristle-like hairs. 29 



29(30) Prothorax not well developed, inconspicuous or invis- 

 ible from above; tarsi five jointed; mouth parts 

 developed into an un jointed trunk; palpi present. 

 Adults in part. (Comstock, 413; Lutz, 229.) 



Order Diptera 



30(29) Prothorax well developed. 31 



31(32) Body strongly compressed; tarsi five jointed. Adults. 

 (Comstock, 490; Lutz, 279.) Order Siphonaptera 



32(31) Body not compressed; tarsi one, two, or three jointed. 



33 



33(34) Last joint of tarsi bladder-like or hooflike in form and 

 without claws; mouth parts forming a triangular, 

 unjointed beak; palpi present. (Lutz, 79; Comstock, 

 119.) Order Physopoda or Thysanoptera 



34(33) Last joint of tarsi not bladder-like and furnished with 

 one or two claws; mouth parts forming a slender, 

 usually jointed beak, usually directed backward 

 between the legs, palpi apparently wanting. Nymphs 

 in part. (Comstock, 121; Lutz, 80.) 



Order Hemiptera 



35(1) Aquatic forms. 36 



