ABT. 16 NORTH AMERICAN ICHNEUMON-FLIES CUSHMAN 33 



DIAPETIMORPHA RUFIGASTER, new species 



Female. — Length, 8 mm. 



Temples very strongly narrowed and nearly flat, subpolislu-d; 

 cheeks subpolished convex, not swollen, lower end of occipital carina 

 not at all sinuate or prominent; frons finely coriaceous; face very 

 slightly narrower than frons, densely finely punctate, almost flat 

 without distinct impressions; clypeus not strongly convex, without 

 a reflexed margin, apex rounded ; malar space two-thirds as long as 

 basal width of mandible, teeth of mandible subcqual; antennae as 

 long as body; flagellum very slender, slightly thickened in middle, 

 joint 1 longest, 2 slightly longer than 3, 4 two-thirds as long as 3, 

 others successively gradually shorter. Thorax anteriorly and dor- 

 sally shining, laterally and posteriorly opaque; pronotum striate in 

 impressions, polished along margins; mesoscutum with fine, sepa- 

 rated punctures, notauli fine anteriorly, soon becoming obsolete; 

 scutellum polished, margined laterally in basal half; mesopleurum 

 and sternum densely finely punctate, metapleurum somewhat more 

 coarsely so, mesopleurum somewhat striate above, speculum polished ; 

 propodeum with basal carina strong, apical weak but distinct, apophy- 

 ses long, compressed, basal areas finely rugulose, middle areas 

 reticulate rugose, apical areas transversely rugulose, spiracles small 

 oval ; cubitus obsolete beyond second recurrent ; nervulus interstitial ; 

 postnervulus broken above middle; nervellus reclivous, broken at 

 middle, its upper (ibscissa perpendicular to cubitella ; legs slender, 

 front tibia not at all inflated. Abdomen only a little longer than 

 head and thorax, subclavate; first tergite slender, polished, post- 

 petiole gradually widening toward apex; second tergite twice as 

 long as broad at base and nearly twice as wdde at apex, this and fol- 

 lowing tergites finely coriaceous; sheath as long as abdomen exclu- 

 sive of first tergite ; ovipositor slender, compressed, sagittate at apex. 



Head and thorax black and yellowish white, legs and abdomen 

 largely red; orbits except narrow interruption on malar space, mid- 

 dle of face, clypeus largely, incomplete annulus on flagellum center- 

 ing on seventh joint, humeral margin and collar of pronotum, two 

 lines on middle of mesoscutum and a small spot near each lateral 

 margin, tegulae, subalar tubercle, a spot above speculum, a large spot 

 covering lower part of mesopleurum and side of sternum and par- 

 tially divided by sternaulus, scutellum, postscutellum, both upper and 

 lower divisions of metapleurum, a small spot on each side of pro- 

 podeum near base and a broad stripe on each side from basal carina 

 to apex enclosing the apophyses, front coxae and trochanters, middle 

 coxae, apex of first tergite and of seventh tergite yellowish white; 



