304 ELEMENTARY ENTOMOLOGY 



G. Antennae filiform. Cockroaches ; grasshoppers ; 

 walking sticks. (Page 76) ... ORTHOPTERA 

 GG. Antennae serrated, or of various types, but not fili- 

 form. Fireflies, etc. (Page 136) . . COLEOPTERA 

 BB. Winged insects. 



C. First pair of wings horny, meeting in a straight line down the back. 

 D. Abdomen with forceplike appendages. Earwigs. (Page 87) 



EUPLEXOPTERA 



DD. Abdomen without forceplike appendages. (Page 136) 



COLEOPTERA 

 CC. First pair of wings leathery or membranous. 



D. Wings membranous ; the second pair, if present, not folded in 



plaits under first. 



E. Head prolonged into beak, at the extremity of which are 

 the biting mouth-parts. Scorpion-flies. (Page 93) 



MECOPTERA 

 EE. Head not prolonged into beak. 



F. Wings with but few cross veins. (Page 243) 



HYMENOPTERA 



FF. Wings net-veined ; abdomen broadly joined to thorax. 

 G. Abdomen provided with two or three long, many- 

 jointed filaments. (Page 95) . . EPHEMERIDA 

 GG. Abdomen without jointed filaments. 



H. Antennae short, awl-shaped, and inconspicuous ; 

 wings of equal size, held horizontal, vertical, or 

 parallel to the body ; not rooflike. Dragon-flies. 



(Page 98) ODONATA 



HH. Antennae not awl-shaped, more or less prom- 

 inent. 



/. Wings folded flat on body. Body compact, 

 antlike, and flattened or louselike in form. 



PLATYPTERA 

 //. Wings rooflike over body ; body linear. (Page 



90) NEUROPTERA 



DD. First pair of wings more or less leathery, with second pair 



folded under first. 

 E. Wings clothed with hairs. Caddis-flies. (Page 93) 



TRICHOPTERA 

 EE. Wings not clothed with hairs. 



F. First 'pair of wings leathery, second membranous. Not 



alike in structure. (Page 76) ... ORTHOPTERA 



FF. Wings alike in structure, both more or less leathery. 



G. Tarsi 5-jointed. (Page 90) ... NEUROPTERA 



GG. Tarsi less than 5-jointed. Stone-flies. (Page 97) 



PLECOPTERA 



