38 U. S. NATIONAL MUSEUM BULLETIN 2i6 



13. Propodeum with rather strongly elevated, dorsomedial carinae; first ab- 



dominal tergite moderately elevated; front coxa usually blackish. 



8. brevicornis (Gravenhorst) 



Propodeum without distinct, dorsomedial carinae; first tergite of abdomen 



only slightly elevated; front coxa whitish . . 10. tenebrosus, new species 



14. Hind tibia with a broad, yellowish brown to reddish yellow median annulus 



that is not sharply delimited from the brownish or fuscous subbasal and 

 apical annuli; hind corner of pronotum without a distinct, pale spot. 



9. canadensis, new species 

 Hind tibia with a broad white median stripe or annulus that is sharply de- 

 limited from the reddish brown or black subbasal and apical annuli; hind 

 corner of pronotum with a distinct pale spot 15 



15. Front femur with a broad, deep, oblique excision beneath; clasper rather 



narrowly rounded at apex; hind tibia with median, pale annulus extending 



close to apex on outer side 12. aplopappi (Ashmead) 



Front femur with a moderately broad and rather shallow, transverse excision 

 beneath; clasper very broadly rounded at apex; hind tibia with median, pale 

 annulus not extending close to apex on outer side. 



11. dioryctriae, new species 



FEMALES 



1. Sheath about 0.4 times as long as abdomen (fig. 310,b); abdominal sternites 



2.5 to 3.0 times as long as wide. Imparis group (p. 38) 



6. imparis, new species 



Sheath at least 0.6 times as long as abdomen; abdominal sternites 1.5 to 2.0 



times as long as wide 2 



2. Head very thick (not more than 1.65 times as broad as long) ; thorax elongate, 



subcylindrical; hind coxa unusually slender (not more than 0.66 times as 

 deep as long) ; ovipositor slender and weakly compressed, with nodus very 

 weak or absent; sheath finely, rather inconspicuously hairy. Ephialtoides 



group (p. 40) 3 



Head not especially thick (at least 1.75 times as broad as long) ; thorax mod- 

 erately stout; hind coxa not unusually slender (at least 0.66 times as deep 

 as long) ; ovipositor not especially slender and usually moderately com- 

 pressed, with nodus usually distinct (absent in atrocoxalis) ; sheath (except 

 in subtilis) with rather coarse, conspicuous hairs 5 



3. Basalmost ridge on apex of lower valve of ovipositor only slightly oblique 



(forming an angle of about 60° with longitudinal axis of valve); upper 



valve of ovipositor without a nodus 1. protentus, new species 



Basalmost ridge on apex of lower valve of ovipositor strongly oblique (form- 

 ing an angle of about 30° with longitudinal axis of valve) ; upper valve of 

 ovipositor with a very weak nodus 4 



4. Sheath as long as body; abdominal tergites 2-5 with strong, dense punctures 



(intervals between punctures usually less than diameter of puncture). 



2. ephialtoides Cushman 

 Sheath a little shorter than body, at most as long as thorax and abdomen; 

 abdominal tergites 2-5 with rather shallow, sparser punctures (intervals 

 between punctures usually equal to or exceeding diameter of puncture). 



3. longicorpus, new species 



5. Upper valve of ovipositor with nodus rather strongly developed and with 



region beyond nodus distinctly, transversely flattened; apex of lower valve 

 with oblique ridges strongly elevated and distinctly arcuate (fig. 310,f). 

 Vesicarius group (p. 46) 6 



