EBERHART'S KEY TO THE FAMILIES OP INSECTS. 



A KEY TO THE PRINCIPAL FAMILIES OF 

 HYMENOPTERA. 



A. One joint between the coxa and femur. 



a. First joint of hind tarsi more or less cylindrical; not conspicuously wide or hairy. 

 b. Front wings flat and not folded. 



c. An erect scale or two knots on the first joint of the abdomen. 



FORMICIDyF., ( Ants ) . 



ce. Scales or knobs absent. 



'/. Prothorax extending to the bases of the front wings. 



Pompilid.«, ( Wasps ami hornets.) 

 dd. Prothorax not reaching the bases of the wings. 



Sphegid.e, (Mud wasps, etc.) 

 bb. Front wings having a fold lengthwise. 



Vespid.k, {Wasps and hornets.) 

 na. First tarsal joint of hind legs somewhat compressed, inner side more or less hairy. 



Apid.e (Bees). 



AA. Two .joints between coxa and femur. 



e. No lanceolate, and less than three basal or inner cells in front wings. 

 /. Recurrent veins absent from front wings. 



CiiAi.ciDiD.v:, | Ghaidd-Jlies). 

 ff. One or more recurrent veins present. 



ICHNEUMONID.K f It'll IH'il MOrl-JtieS.) 



ee. Lanceolate cell present. 



TENTIIREDrNID.E {Sair-jli, 8. ) 



