10 U. S. NATIONAL MUSEUM BULLETIN 216 



10. Second tergite with long, strong, basolateral grooves that cut off its baso- 



lateral corners (figs. 288, a, b) ; first tergite rather long, usually about as long 



as second tergite (figs. 288,a,b) 11 



Second tergite without oblique basolateral grooves or with relatively short 

 and weak grooves (figs. 285, a; 287) ; first tergite rather short, usually much 

 shorter than second tergite (figs. 285,a; 287) 12 



11. Lower valve of ovipositor without a subapical dorsal lobe (fig. 330,b); tip of 



upper valve of ovipositor with a dorsolateral, finely notched ridge; thorax 

 of the Nearctic species largely ferruginous .... 6. Anastelgis (p. 109) 

 Lower valve of ovipositor with a subapical dorsal lobe (figs. 330, c-h) ; tip of 

 upper valve of ovipositor rounded above, without a dorsolateral ridge; 

 thorax of the Nearctic species black, the mesosternum and lower part of 

 mesopleurum sometimes tan or stramineous . . . 7. Dolichomitus (p. Ill) 



12. Clypeus about 2.5 as wide as long, rather flat (fig. 287,b), in the male always 



white or whitish; lower tooth of mandible distinctly longer than upper 

 tooth; ovipositor sheath 1.8 to 5.0 as long as front wing; apex of ovipositor 

 a little depressed, the ridges of its basal teeth turned strongly forward 



dorsally (figs. 329,h; 330,a) 5. Pimpla (p. 100) 



Clypeus about 1.8 as wide as long (figs. 285,a; 287,a), ferruginous to black, 

 never white; lower tooth of mandible the same length as upper tooth; 

 ovipositor sheath 1.0 to 6.0 as long as front wing; apex of ovipositor a 

 little compressed, the ridges of its basal tooth straight or moderately 

 straight (figs. 329,c,e-g) 13 



13. Median longitudinal carinae of propodeum distinct on the basal 0.25 or more 



of propodeum (fig. 285,a) ; body moderately elongate . 1. Exeristes (p. 10) 



Median longitudinal carinae of propodeum absent or indistinct (fig. 287, a); 



body very elongate 4. Apistephialtes (p. 87) 



1. Genus Exeristes 



Figure 285,a 



Exeristes Foerster, 1868, Verh. Naturh. Ver. Rheinlande, vol 25, p. 164. Type: 



(Pimpla roboralor Gravenhorst) = roborator (Fabricius) ; included by 



Schmiedeknecht, 1888. 

 ILiogaster Kriechbaumer, 1890, Ent. Nachr., vol. 16, p. 297. New synonymy. 



Name preoccupied. Type: (Liogasier longulus Kriechbaumer) = ? arundinis 



(Kriechbaumer). New synonymy. 

 ? Liotryphon Ashmead, 1900, Canadian Ent., vol. 30, p. 368. New name for 



Liogaster Kriechbaumer. 



Front wing 3.2 to 9 mm. long; body moderately elongate; face and 

 clypeus black or blackish or the clypeus tinged with ferruginous; 

 clypeus moderately narrow, weakly convex with its apex impressed 

 and made bilobed by a median apical notch, in the male of E. robor- 

 ator with a median apical tubercle ; occipital carina strongly dipped on 

 the midline; mesoscutum with moderately dense, evenly distributed 

 hairs; submetapleural carina complete; propodeum short or moder- 

 ately short, its median longitudinal carinae sharp on its basal 0.3 ±; 

 areolet subtriangular, longer than high, receiving second recurrent 

 vein before its apex; nervellus broken near or above the middle; first 

 tergite short, broad, its lateral longitudinal carina vestigial, its median 



