TABLE OF FAMILIES. 1 ] 



11. — Anterior wings without complete or closed snbniarginal cells 12. 



Anterior wings w'ith at least one closed and coni])lete subniarginal cell. ..13. 



12. — Abdomen petiolate, of 9 very long and slender, cylindrical, at least five 



times longer than the head and thorax, nnich shorter ;im(1 chivate in % ; 



antennae long, not elbowed, thread-like; body smooth and polished, black. 



PELECINID^. 

 Abdomen sessile, a little longer than the head and thorax, comijosed ap- 

 parently of only 3-5 segments, the remainder modified into a slender, 

 cylindrical, retractile, telescopic-formed apparatus, generally notexserted ; 

 antennae elbowed, short; body adorned with metallic colors, and often 



coarsely and deeply sculptured. — Tubulifera CHRYSIDID^. 



13. — Posterior tarsi with the basal joint more or less cylindrical, never much 



widened or densely pubescent 14. 



Posterior tarsi with the basal joint more or less compressed and dilated and 



densely pubescent beneath, rarely subcylindrical. — Anthophila 32. 



14. — Petiole of abdomen with one or more scales or nodes; three sexes, % 9 sind 



^ . — Heterogyna 15. 



Petiole of abdomen simple, without scales or nodes ; two sexes, % and 9 ...18. 



15. — Petiole composed of a single joint IH. 



Petiole composed of two joints MYRMICID.^. 



16. — Abdomen proper constricted between segments 1 and 2 PONERID^E. 



Abdomen proper not constricted between segments 1 and 2 17. 



17. — Insertion of mandibles distant. 



Clypeus always distinct and often very large; petiole of altdomen almost 



always surmounted by an erect scale FORMICIDJE. 



Clypeus very small or indistinct; % abdomen long subcylindrical. jietiole 

 depressed, nodiform ; (9 and ^ not positively known )...DORYLID^. 



Insertion of mandibles contiguous ( ^ 9) ODONTOMACHID^. 



18. — Wings not folded longitudinally. — Fossores li). 



Wings more or less folded longitudinally in repose. — Diplopteryga 30. 



19. — Prothorax consideral)ly produced jjosteriorly, the hinder angles reaching 



the tegulse; 9 sometimes apterous 20. 



Prothorax usually consisting of little more than a narrow collar, the poste- 

 rior angles not reaching the tegula»; 9 never apterous 23. 



20. — Abdomen with the first ventral segment distinctly separated from the second 



by a more or less deep constriction or furrow 21. 



Abdomen with the first ventral segment not separated from the second by 



a furrow or constriction of the joint 22. 



21. — Intermediate tibise with two ai)ical spurs, their coxse contiguous or but little 



separated; 9 apterous MUTILLID^. 



Intermediate tibia> with a single apical spur, very rarely with two, their 



coxfe., as a rule, widely sejiarated ; 9 winged SCOLIID.^. 



22. — Posterior legs short, not reaching to the apex of the abdomen : eyes einar- 



ginate within SAPYGID^. 



Posterior legs long, reai-hing Ik yinid the apex of tin- abdomen ; ej'es not 



emarginate within POMPILID.^. 



23. — Anterior wings with three complete subniarginal cells 24. 



Anterior wings with two comi)lete submarginal cells 2!l. 



Anterior wings with only one complete and distinct submarginal cell. 



CRABRONID^. 



