No. 22.] HYMENOPTERA OF CONNECTICUT. 65I 



Key to Families. 



1. Mesosternum produced posteriorly into an elongate process 



which is cleft or bifurcate apically; notauli present; mid 

 tibiae with two apical spurs; prothorax long; propodeum 

 long; femora swollen near middle; prepectus present.... 



AMPULICID^ p. 651 

 Mesosternum not produced into an elongate process; notauli 

 wanting; prothorax usually transverse; femora normally 

 not swollen in the middle 2 



2. Prepectus present SPHECID^ p. 652 



Prepectus wanting 3 



3. Antennae inserted close to clypeus; cheeks narrow; first 



abdominal segment not narrower than second; lower pos- 

 terior margin of propodeum angled due to metathoracic 

 pleural suture being dorso-ventral; no dorsal plate to 



mesepisternum BEMBICID^ p. 691 



Antennae inserted much above clypeus; cheeks broad; first 

 abdominal segment much narrower than second; lower 

 posterior margin of propodeum rounded due to metatho- 

 racic pleural suture being curved; a dorsal plate to mesepi- 

 sternum CERCERID^ p. 694 



AMPULICID^. 



Within our area there is but one genus which belongs to this 

 family. The wasps belonging to this genus are small, about lo 

 mm. long, black, and have the wings more or less marked with 

 fuscous. The habits of our species are unknown, but the 

 European Ampulex compressus preys on cockroaches. 



Rhinopsis Westwood. 

 Key to Species. 



Clypeus not carinate apically, apical middle margin quinque- 

 dentate, the sides of its production sinuate; mandibles 

 rufo-ferruginous; head uniformly sculptured; pronotum 

 finely, transversely striato-granular posteriorly; mesoscu- 

 tum without large lateral punctures; notauli not foveolate; 

 mesepisternum granular, with a few large punctures 

 dorsally caniculatus 



Clypeus with a carina in apical middle with one apical tooth, 

 sides of its production not sinuate; mandibles, except the 

 piceous apices, black; front striato-punctate, the rest of the 

 head finely granular, with large scattered punctures; prono- 

 tum coarsely, transversely striato-reticulate; notauli foveo- 



