Order Hymenoptera 



2 — Tarsi dilated or thickened; hairs of head and thorax feath- 

 ery Super-family Apoidea 



Tarsi slender; hairs on head and thorax simple 



Super-family Sphecoidea. 



3 — Trochanters always one-jointed, (except in the family 



Trigonalidae. ) 4 



Trochanters two-jointed (except in the family Pelecinidae,) 

 Super-family Proctotrypoidea. 



4 — Petiole, or first segment of abdomen simple, without swel- 

 lings; winged forms with well-developed tegulae 



Super-family Vespoidea. 



Petiole with one or two swellings; winged forms without or 



with imperfectly formed tegulae.. Super-family Formicoidea. 



5 — Front wings with the marginal vein, if present, linear, never 



large or stigmated 6 



Front wings with a stigma; the marginal vein usually large 



and stigmated Super-family Ichneumonoidea. 



6 — Pronotum extending back to the tegulae 



Super-family Cynipoidea. 



Pronotum not extending back to the tegulae 



Super-family Chalcidoidea* 



Phytophagra. 



Tibiae of forelegs with one apical spur 



Super-family Siricoidea. 



Tibiae of forelegs with two apical spurs 



Super-family Tenthredinoidea* 



