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372 AMERICAN HYMPN0PTP:RA. 



Xyloiioniu!i> catointis n. sp. 



9. — 22 mm.; ovipositor 23 mm. Black, to dusky fuscous; head closely and 

 coarsely punctured, dusky rufous, with dusky spot on vertex around ocelli and 

 extending downward to the antennse ; labial palpi and mandibles piceous ; maxil- 

 lary palpi long, slender at apex ; antennse black, with pale annulus on segments 

 14-lfi; scape small, rufous: thorax piceous, paler on mesonotum and pleurae, 

 coarsely and closely punctured, sometimes scabrous ; mesonotum trilobed ; scutel- 

 lum prominent, coarsely punctured and with central longitudinal carina; mpta- 

 notum with four distinct, irregular, longitudinal carinfe,, the outer ones culmina- 

 ting in a short, sharp spine; prothoracic shoulders square, but not tuberculate : 

 abdomen opaque, owing to the fine transverse stripe ; two basal segments color of 

 the head, the others black ; apex tapering, pointed ; basal segment long, gradually 

 expanded : wings subhyaline, transversely clouded beneath apical half of stigma ; 

 from this clouded band to the ai«ex, hyaline; stigma brown, paler in center and 

 white at base ; veins brown, ferruginous at base; anterior legs, middle coxje and 

 trochanteis of hind legs dusky rufous ; middle femora and tibige piceous to rufous ; 

 hind co\<i\ femora and tibige black to ]>iceous, tarsi fulvous; four anterior tibiae 

 much jiinched at base. 



Two .si)ecimens from Craigs Mountain and Moscow, Idaho (Prof. 

 Aldrich). 



