8 PROCEEDINGS OF THE NATIONAL MUSEUM. volxxhi. 



differently; and b}" the shape of the hind legs, which differ decidedly 

 from the other two subfamilies, the femora being* shorter and thicker, 

 the tiliia' very strongh' clavate, while the basal joint of the tarsi is 

 stout, and as long or a little longer than the following joints united: 



The habits of the species, too, are quite different from the others, 

 since all whose parasitism is known have been bred from the nests 

 of wasps and bees — Crahro, PhUanthus^ Cerceris^ Gorytes^ Stisus, 

 Eumenes^ 0(7yn<?ru.<^, Sp/iecodes, Prosojns. TIaJictus, A)idrena, etc. 



The two genera falling in this group may be separated as follows: 



TABLE OF GENERA. 



Front wings inihrnit a distinct venation, at most with only slight traces of a venation, 

 as in Pelecimis; head glo))ose and deejily excavated anteriorly above for the 

 reception of the scape (3) Leptofoenus Smith. 



Front wings with a distinct venation; head large, viewed from above subtriangular 

 or obtrapezoidal, the temples oblique, broad; no excavation anteriorly for tlie 

 reception of the scape (4) Gasteruption Latreille = Foenus Fabricius. 



Subfainily III. AAJTuA^CllSfJE. 



1840-42. AidacidcV, Family, Shuckard (part), Newman's Entomologist, p. 121. 

 1900. AuJacina', Subfamily I, Ashmead, Smith's Insects of New Jersej', p. 563. 



This group was first recognized hy W. E, Shuckard as above, but 

 he incorrectly included as components of it Ti'igonalys Westwood and 

 Lycogaster Shuckard, which have no real affinity with it, but represent 

 a distinct f amih^ far removed from any family belonging in this series. 



The Trigonalidw are now placed in the superfamily Yespoidea 

 between the Bethylidw and the S(q)ygidce. 



The Aidaciiiw, as here restricted, are easily distinguished from the 

 other two subfamilies ]\v having the antennte inserted on the anterior 

 margin of the head, just above the clvpeus, by the quadrate or sub- 

 globose head, and ])y the venation of the front wings, which have 

 usualh" two recurrent nervures. 



The abdomen, too, is quite different from the other groups, being- 

 elongate, clavate, and onl}- slightly compressed. 



All of the species are parasitic on the larva? of different Coleoptera, 

 those belonging to the family Ceramhycidw being particularly subject 

 to their attacks. 



Three genera have been recognized, distinguishable as follows: 



TABLE OF GENERA. 



First cubital cell receiving the first recurrent nervure toward the middle; hind 

 coxse swollen, much elongate, and j,)rolonged within beyond the insertion of 



the trochanters (5) Pammegisclna Provancher. 



First cubital cell receiving the first recurrent nervure at or near the tip, or inter- 

 stitial with the first transverse cul)itus; hind coxa' normal, not prolongeil 

 within. 



Claws with one tooth lieneath (6 ) Anlacus Jurine. 



Claws with three or more teeth beneath (7) Pristaulacus Kieffer. 



