16. Hind wings folded like a fan 



Orthoptera, Gryllidae Crickets 

 Wings not so folded; mouth parts not evident 

 Trichoptera Caddis or Trout Flies 



17. With two or three, long, thread-like filaments extending from end of 



body and with wings held up vertically 

 Ephemerida May-flies 

 (Plectoptera) 

 Without such long filaments 18. 



18. Not fly 'like; body wide and much flattened 



Orthoptera, Blattidae Cockroaches, Croton-bugs 

 Fly-like; body little, if at all, flattened 19. 



19. Head lengthened to form a beak-like structure bearing biting mouth parts 



at the tips 



Mecoptera Scorpion Flies 

 Without such a trunk 20. 



20. Antennae very short; wings long and narrow and with an apparent joint 



near the middle of the front edge 21. 



Antennae easily seen; wings without such joint 22. 



21. Wings held horizontally when at rest; hind wings larger than the front 



wings 



Odonata, Amsoptera Dragon-flies 

 Wings held parallel with abdomen, or uptilted; fore and hind wings 

 almost equal 



Odonata, Zygoptera Damsel-flies 



22. Body very long and slender; antennae enlarged at tips 



Jsleuroptera, Myrmelion:dae Ant-lions 

 Body not extremely slender; antennae not enlarged at tips 23, 



23. Tarsus (end section) of last leg with five segments 



J\leuroptera Lace-wings, Dobson Flies or Corydalus 

 Tarsus of hind leg with less than five segments 24. 



24. Thorax before wings about as wide as long; wings clear, with distinct 



veins 



Plecoptera Stone-flies 

 Thorax before wings short, much wider than long; wings whitish, with 

 indistinct veins 



Isoptera Termites or ''White Ants" 



25. With rudimentary or vestigial wings 26. 

 With no indications of wings 39. 



26. With large structures resembling a pair of pinchers at the posterior end 



of the body 



Dermaptera Earwigs 

 Without such structures 27. 



27. Living in water 28. 

 Living on land 32. 



231 



