330 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 58. 



declivous from base, lateral ridges usually weak, spiracles usually round or short oval; 

 intercubitella usually more than half as long as basal abscissa of radiella; hind tibiae 

 and tarsi usually annulated; apical spines of tarsal joints short, those of the fourth 

 joint of front tarsus not reaching middle of fifth joint; claws of front tarsi in female 

 with more or less distinct basal lobe Itophctis (Foerster), 



Subgenus Ephialtes Schrank. 

 Ephialtes Schrank, Fauna Boica, vol. 2, pt. 3, 1802, p. 316, (not Gravenhorst. 



1829). Type, Ichneuvion covipunctor Linnaeus (=Pimpla instigator Fabricius. 

 Pimpla Authors, part. 

 Pimplidea Viereck, Bull. 83, U. S. Nat. Mus., 1914, p. 117. (New name for 



Pimpla Authors, not Fabricius). Type, Pimpla pedalis Cresson. 



KEY TO NORTH AMERICAN SPECIES. 



1. All legs, except yellowish mark on prothoracic, black to piceous (hind legs some- 



times red, especially in male) 2. 



TiCgs mostly reddish 3. 



2. Abdomen black; scutellum with yellow spot; wings blackish; malar space 



barely half as long as basal width of mandible maura (Cresson). 



Abdomen red; scutellum black; wings hyaline; malar space distinctly more 

 than half as long as basal width of mandible ellopiae (Ilarriugton). 



3. Coxae black 4, 



Coxae red 5. 



4. Apical half of hind tibiae and their tarsi fuscous sodalis (Ruthe). 



Hind tibiae and tarsi entirely red longigenalis Cuehman. 



5. Front tibiae in female increasing gradually in size from base to apex; first tergite 



■with a more or less prominent elevation each side of middle; hind tibiae black 



without a trace of annulation pedalis (Cresson). 



Front tibiae in female swollen in middle 6. 



6. Hind tibiae red or blackish, not or but obscurely annulated, with reddish or 



whitish 7. 



Ilind tibiae black with a distinct white annulus 10, 



7. Hind tibiae in female in lateral view increasing gradually in size from base to 



apex 8. 



Hind tibiae in female in lateral view with a distinct though slight swelling be- 

 tween middle and base 9. 



8. Legs slender; hind tibiae blackish with a fairly distinct reddish annulus, their 



spurs w^hite; both maxillary and labial palpi white (male only knowoi) 



yakutatensis (Ashmead). 



Legs stout; hind tibiae usually entirely red, sometimes infuscated and rarely 



with a very obscm-e annulus, the spiu-s reddish or fuscous; at least the labial 



palpi blackish or piceous sanguineipes (Cresson). 



9. Hind tibiae entirely red; palpi and tegulae w^hite punicipes (Cresson). 



Hind tibiae fuscous, with an obscure reddish annulus near base; palpi and 



tegulae piceous exareolala (Ashmead). 



10. Abdomen liuely punctate, the tergites ^vithout definite polished apices; scu- 



tellum in male white marked (female unknown) aquilonia (Creseon). 



Abdomen rather coarsely punctured, the tergites with apices polished, Bcutdllum 

 in male not white marked 11. 



11. Front tibiae in female not at all excavated beyond middle; only the hind tibiae 



annulated; tegulae black; front coxae black to piceous, darker in male 



tenuicornis (Cresson). 

 Front tibiae in female more or less deeply excavated below middle; both hind 

 and middle tibiae usually annidated ; tegulae nsually white; front coxae tes- 

 taceous aequalis (Provancher). 



