520 U. S. NATIONAL MUSEUM BULLETIN 216 



This species is in the Alleghanian and Carolinian faunas. It para- 

 sitizes species of Saperda in hardwoods. Adults occur from mid 

 spring to early fall. 



V. MAUDAE GROUP 



Body rather slender; occipital carina broadly interrupted above; 

 top of head with small, close punctures and a tendency toward trans- 

 verse rugulosity; lower half of temple with oblique aciculation which 

 near midheight of temple approaches horizontal (fig. 316,g); tooth 

 at upper end of epomia weak (for the genus) ; areola subpentagonal, 

 its basal corner broadly open; median longitudinal carinae of pro- 

 podeum approximate basad of areola but always well separated (fig. 

 315, d); area dentipara with a short, strong, acute tooth at its apex; 

 front tibia of female rather strongly swollen, its front side with a 

 moderate number of strong, spinelike bristles; comb of bristles on 

 apex of front tibia on inner side rather weak (fig. 313,i); first tergite 

 of male about 2.4 as long as wide, of female about 1.75 as long as wide; 

 basal half of first tergite strongly arched in profile, its apical half 

 almost flat in profile; sublateral longitudinal carina of first tergite 

 strong to the apex; median longitudinal carinae of first tergite sharp 

 on basal half, obsolescent but usually discernible as a low ridge 

 beyond the middle; faint oblique groove beyond the middle of first 

 tergite, extending between median and sublateral longitudinal 

 carinae; second tergite with a sharp oblique groove cutting off its 

 basolateral corner, sublaterally the groove swinging mesad and 

 fading out. 



This group is intermediate between the albopictus group and the 

 stigmapterus group. It includes the three Nearctic species below and 

 the European X. filiformis (Gravenhorst), 1829. All of these except 

 the Nearctic X. atrox are very closely related and may be only sub- 

 specifically distinct. Xorides filiformis is genotype of the name 

 Sichelia. 



15. Xorides (Xorides) atrox, new species 



Female type: Front wing 9.5 mm. long; temple not quite reaching 

 outside tangent of eye; upper third of temple with rather close, small 

 punctures and a little rugulosity, not distinctly striate. 



Black. Clypeus dark brown, its margins pale brown; labrum pale 

 brown; mandible ferruginous, its apex blackish; palpi blackish brown; 

 flagellum with a white band covering 6.5 segments; basal 0.12 of 

 tibiae, basal 0.6 of front basitarsus, basal 0.4 of middle and hind 

 basitarsi, and third and fourth segments of all tarsi, white. 



Type: 9, Robson, B. C, July 13, 1939, H. R. Foxlee (St. Paul). 



