12 OKNEKA OK IIYMKNOJTKUA. 



24.— AlHlonu'Ti lnUllrta 25. 



Alxloini'ii MMlto or Hubnt'sHile, very ran-ly subiH-tiolato 'J7. 



85. — First siibniarKiual «'»'ll not receiving a rt'i'iirreiit lUTVurt' 2fi. 



Fii-st siibiiiarjjiiial ci-ll n'ctiiviiiK a r»'curn'iit lurviirt' MELLINIDiE. 



26. — IVtioU' of alMloini-ii eyliiidrifwl, siiKMitli : Hagelluiii l<-i»(l ^r at apex; iiit«'r- 



iiii'diate tibia' with two apical spurs SPHECID^. 



Pftiolc of alxloiiu'ii <l('|ir«'s«<'(l and mMicrally fiiri'Oiv»-»i alxivo; flaucilnni 



tlii( kciK'd at »|)<-x ; iiiildlc tibia- witli one ajiical -ipiir MIMESID^. 



27. — 8e«'ond siibiiiarKiiial ci-ll u'Cfivinji Ixtth rt-ciirrent luivurcH. tlie first ri-riir- 



reiit rari'ly uniting witii tlio first traiifsversi- cubital nervure •^. 



.Second and third .siiitinarginal celi.-i cacli rcceivinj; a recurrent nervure. 



PHILANTHID-ffiJ. 



2H. — Marginal cell appendicnlate ; mandibles more of less deeply emarginate on 



exterior margin, scarcely so in Astatn antl Liris, in which the marginal cell 



is obli((uely truncate at tip and the labruni not exserted LARRID^S!. 



Marginal cell not appeiuliculate ; mandibles with exterior margin entire. 



Labrum short, not or scarcely exserted NYSSONID.S1. 



Labruni distinctly exserted, sometimes rostriforni BEMBECID.^. 



29. — Prothorax long and narrow, produced anteriorly into a neck ; mctathorax 

 elongate, truncate jxistoriorly ; clypeus cariuate, rostriforni. 



AMPULICID^.* 

 Prothorax short, transverse ; metathorax short, rounded i)i>sttriorly : clypeus 



not carinate or rostriforni PEMPHREDONID.^. 



:jO. — Antenme clavate or knobbed at ai)ex, the joints of the club generally sol- 

 dered together; scutelluni large, narrowetl and rounded jiosteriorly, su- 

 perposed upon the postscutellum; anterior wings indistinctly folded in 



repo.se MASARID^. 



Antennse filiform or subfiliforni ; scutellum transverse, truncate posteriorly, 

 not overhanging the postscutellum ; anterior wings distini tly folded in 



repose ;U. 



:51.— Intermediate tilme with one ajiical spur EUMENID.ffi. 



Intermediate tilmcwith two apical sjjurs VESPID.^. 



3'2. — Labium flattened, shorter than the mentuni; basal joints of labial pal))! not 



unlike the following joints ANDRENID^. 



Labium slender, not flattened, longer than the nientuni ; l>asal joints of 

 labial palpi elongate APID^. 



* The typieal number of submarginal cells iu this family is three ; but the 

 onlv representative we have in our fauna has but two. i^mith, however, .states 

 that the ncuratiou is very inc>,nstaiit, and that the first transvei-se cubital ner- 

 vure is frequently obsolete, or partly so, in specimens of the same species. 



