NO. 2334. NORTH AMERICAN ICHNEUMON-FLIES— CUSHMAN. 285 



but differ in having the scutellum flat without lateral carinae and 

 not declivous behind, the areola hexagonal rather than quadrate, 

 and the sixth tergite not excised. In mj key to females both run 

 out at couplet 25, but agree with neither alternate, but better with 

 tetralophae Cushman. From the key characters applying to that 

 species both differ in having the ovipositor sheath much less than 

 twice as long as the first tergite. 



CREMASTUS (ZALEPTOPYGUS) OBESUS, new species. 



Female. — Length, 5.25 mm.; antennae, 4 mm.; ovipositor, 2.5 mu.. 



Head from above fully twice as broad as long, with temples narrow, 

 weakly convex, and sharply slo{)ing, from in front but little wider 

 than long; eyes large, much longer than width of face, parallel 

 within; diameter of lateral ocellus equal to ocell-ocular line; malar 

 space scarcely half as long as basal with of mandible; clypeus strongly 

 arched basally, broadly rounded at apex, weakly convex; head 

 minutely shagreened, interspersed on face with scattered minute 

 punctures; thorax very short and stout, sculpture fine shagreening 

 interspersed with minute punctures; mesoscutum wider than long, 

 notauli weak except anteriorly; scutellum flat; propodeum short, 

 steeply declivous nearly from base, shagreened, petiolar area trans- 

 versely striate; areola hexagonal, nearly as broad as long, barely 

 half as long as petiolar area; legs slender, longer spur of hind tibia 

 reaching beyond middle of basitarsus; claws pectinate; wings broad, 

 basal vein and second abscissa of radius straight; discocubital cell 

 hardly a half longer than basal vein, second recurrent distinctly 

 more than half as long as basal abscissa of subdiscoideus; compressed 

 portion of abdomen fully a fourth as deep as entire length of abdomen; 

 first tergite comprising distinctly more than a third of the total 

 length and distinctly longer than dorsal length of propodeum, dorso- 

 lateral carina distinct from spiracle to base, postpetiole very finely 

 striate; second tergite but very little more than half as long as first, 

 slightly more than twice as long as basal width, finely longitudinally 

 striate; third tergite striate at base, otherwise, together with remain- 

 ing tergites, shining; ovipositor sheath distinctly more than a half 

 longer than first tergite. 



Dark ferruginous; occiput, vertex, and frons blackish; inner orbit 

 above antenna, lower cheek, mandibles, and clypeus yellow; antennae 

 black, paler toward base especially beneath; pronotum and scutellum 

 slightly paler than surrounding areas; legs pale testaceous, front and 

 middle coxae and trochanters stramineous; hind tibiae infuscate 

 especially at apex; hind and middle tarsi white, darker at apex; 

 tibial spurs white; wings hyaline, veins and stigma dark brown; 

 postpetiole, second tergite largely, and third at base brownish, post- 

 petiole and second tergite yellowish at apex. 



