12 GENERA OF II YMKX( )1'TEKA. 



•24. — AlxloiiR-n iKtiulate -•'• 



AhiloiiR-n sessile or suKsessile, very rarely subpetiolate 27. 



25. — First snlniiar^Mnal cell not reeeivinji a recurrent lurvure 20. 



I'^irst subniar.i;inal cell rereiving a recurrent nervurc MELLINID^. 



26.— Petiole of alidomeu cylindrical, smooth : flafiellum slender at apex ; inter- 



niediate tibia* with two-apical spurs SPHECID^. 



IVtiole of abdomen depressed and {ienerally furrowed above: naiicllum 



thickened at apex : middle tibiiv with one apical spur MIMESID^^. 



27. — Second submarjiinal cell receiving both recurrent nervures, the first lec ur- 



rent rarely unitinji with the first transverse cubital nervure 28. 



Second and third subuiarginal cells each receivinj; a recurrent nervure. 



PHILANTHID^. 



28. — Marjrinal cell ai)pendiculate ; mandibles more or less dee]ily emaruinate on 



exterior margin, scarcely .so in Asfatn and Liris. in which the iiiarsrinal cell 



is obliquely truncate at tip and the lalnum not exserted LARRID^. 



Marginal cell not appendicuhite : mandibles with exterior mar.iiin entire. 



Labruni .short, not or scarcely exserted NYSSONID^. 



Labrum distinctly exserted, sometimes rostriform BEMBECID^. 



29. — Prothorax long and narrow, produced anteriorly into a neck: nu-taIhora.\ 

 elongate, truncate posteriorly; dypeus cariuate, rostriform. 



AMPULICID^.» 

 Prothorax short, transverse ; metathorax short, rounded posteriorly : clypeus 



not carinatc or rostriform PEMPHREDONID^. 



.30. — Antenna; clavate or knobbed at apex, the joints of the club generally sol- 

 dered together; scutellum large, narrowed and rounded posteriorly, su- 

 lierjM)sed upon the postscutellum : anterior wiii.us indistiiictl.v foldid in 



repose MASARID^. 



AntenniB filiform or subfiliform ; scutellum transverse, truncaie posteriorly, 

 not overhanging the po.st.scutellum ; anterior wings distinctly folded in 



rejiose 'il. 



:51.— Intermediate tibije with one apical si)ur EUMENID^. 



Intermediate tibise with two aiiieal sjinrs VESPIDJE. 



32. — Labium fattened, shorter than the ment\im ; basil Joints of labial jialpi not 



unlike the following joints ANDRENID^. 



Labium slender, not flattened, longer than the mentiini; liasal joints of 

 labial paljii elongate APID^. 



•'■ The lypiial iiuiiibcr of subniarginal cells in tliis family is three: liul the 

 onlv I'epresentative we have in our fauna has but two. Smith, however, states 

 that the neuration is very inconstant, and that the lirst transverse cubital ner- 

 vure is fretjuently obsolete, or partly so, in .specimens of the .ssune specie.s. 



