J334. NORTH AMERICAN ICHNEUMON-FLIES— CUSHMAN. 



281 



whence it narrows rapidly to the acute apex, the dorsal surface being 

 largely composed of three tergites, the others much retracted. From 

 most of the genera it differs in the possession of an areolet, which is 

 large and in form nearly like that of MesocJiorus. 



Form short and thick, with abdomen barely as long as head and 

 thorax together; antennae nearly as long as body; head, thorax, 

 and propodeum opaque; palpi normal; propodeum short, precipi- 

 tous behind, hardly extending over hind coxae; wings ample, broad; 

 stigma broad, radius originating beyond middle; radial cell short, 

 not longer on metacarpus than stigma, radial angle slightly obtuse, 

 second abscissa of radius curving slightly forward at distal end; 

 areolet large quadrate, second intercubitus somewhat longer than 

 other three sides, which are subequal; second discoidal cell very 

 short and broad; nervulus interstitial; nervellus perpendicular, 

 weakly broken below middle; abdomen polished; petiole wider than 

 thick, with distinct lateral foveae, edges of tergite distant, not en- 

 closing sternite; postpetiole flattened, several times broader than 

 thick; spiracles at apical two-fifths of segment; second tergite much 

 broader at apex than at base, gastrocoeli indistinct, spiracles before 

 middle; legs long, hind femur reaching nearly to apex of abdomen, 

 femora and tibiae stout, tarsi slender. 

 TyjJe. — Oligotmema -prima Cushman. 



OLIGOTMEMA PRIMA, new species. 



Female. — Length, 4 mm.; antennae, 3 mm.; front wing, 3 mm. 



Head transverse, temples convexly receding; occiput shallowly 

 concave; eyes straight and parallel within, as long as width of face; 

 diameter of ocellus half as 

 long as postocellar line, 

 which equals ocellocular 

 line; entire head including 

 clypeus and temples 

 opaque; clypeus strongly 

 convex and strongly 

 rounded at apex; malar 

 space nearly as broad as 

 basal width of mandible; 

 teeth of mandible equal 

 in length; pronotum 

 obliquely striate below; 

 mesoscutum as wide as 

 long, opaque with minute 

 separated punctures; scu- 

 tellum sculptured like mesoscutum; thorax laterally and propodeum 

 more strongly punctured; areola as wide as long; petiolar area occu- 

 pying more than half the length of propodeum, transverselj^ striato- 



-OUGOTMEMA PRIMA CUSHMAN. (o) LATERAL VIEW. 

 (ft) P03SAL VTEW OF ABDOMEN. 



