1894.] XATr'HAL SCIENt'ES OF PIIILADKI.PHTA. 299 



Subfamily SPIIEGIN^. 

 Represented liy two tribes as follows : — 



Metatliorax uiiarnied, never dentate yi*HE(iINI. 



Metathorax armed with two strong teeth . . . . AMIM'IjICINI. 



Tribe T.— SPHEGINI. 



Three genera belong to this tribe. They have numerous sub- 

 genera or groups of species which at one time were regarded as 

 genera. Kohl's admirable paper, Die Hymenopterengruppe der 

 Spheciden, '•' will be of much value to the student of this group. 



Our genera may be r^eparated in the following manner; — 



Second submarginal cell receiving but one recurrent uervure; 9 

 with or w ithout tarsal comb Sfhex Linnf'. 



Second Bubmarginal cell receiving both nervures. 



o without tarsal coml) Sceliphkon King. 



O with tarsal comb Ammophila King. 



As Kohl's work is probably inaccessible to most workers, I give 

 here a table of groups of the three genera : — 



Genus SPHEX Linne'. 



Second submargiual cell small, much higher than liroad. 

 Claws with a single tooth in middle of inner margin; species 



more or less metallic Gi-. Chlokion. 



Claws with li-o teeth on inner margin; species not metallic. 

 Last ventral plate ( 9 ) compressed, almost keeled medially; claws 

 bidentate; clj'peus produced medially, with a deep sinus on 



each side Gr. Paemode;.s. 



Last ventral plate { 9 ) convex, not comiiressed; claws 2-5 dentate; 



clypeus entire or emarginate medially . . . Gr. Harpactopps. 



Seccmd submarginal cell as broad as high, rhomboidal, or rectangular. 



Metathorax without stigma! furrow; tarsal comb ( 9 ) wanting; 



petiole long and generally bowed Gr, Isodontia. 



Metathorax, with exception of aS'. Lucce, with a stigmal furrow; 

 tarsal comb (9) present, petiole straight Gr. Spiiex. 



Genus SCELIPHRON Klug. 



Prothorax longer than the dorsulum. 



Head from above not triangular, not much produced behind the 

 eyes (the prothorax is but little longer than the dorsulum). 

 Gr. Podium. 



1' Annaleu d. K. K. Xaturliistor. Hofinuseum, Wien, V, 2^o. 2, 3. 



