10 PROCEEDINGS OP THE NATIOlSrAL MUSEUM vol.72 



width of mandible ; clypeus less than half as long as broad. Thorax 

 flattened dorsally, more than twice as long as deep; propodeum 

 straight above, precipitate and concave behind, upper hind angles 

 very prominent, but angulate rather than mucronate, areola and 

 petiolar area confluent and together longer than petiolar area; legs, 

 especially femora, stout; apical joint of hind tarsus as long as 

 second joint; nervellus broken slightly above middle. Abdomen 

 shining, finely and rather densely punctate; first tergite less than 

 twice as long as broad at apex with very strong carinae, spiracle 

 at apical third, petiole very broad, flat above; last three tergites 

 about equal in length and only slightly shorter than fifth; oviposi- 

 tor stout, sword-like, not apically sagittate. 



Head and thorax black, pubescence silvery, palpi brown, scutellum 

 white; legs ferruginous, trochanters and tarsi black, middle tibia at 

 base and hind tibia throughout fuscous; wings grayish because of 

 dense pubescence, veins black, stigma testaceous; abdomen black; 

 second and third tergites somewhat reddish. 



Type locality. — -Bruce, South Dakota. 



Type.—Q^t. No. 40439, U.S.N.M. 



One female taken August 24, 1923, by H. C. Severin. 



EPHIALTES NIGROAENEUS, new species 



Female. — Length 7 mm. ; antennae 7 mm. ; ovipositor 2 mm. 



Head polished, unsculptured, and with only sparse pubescence; 

 eyes sinuate within; face broader than vertex, its sides divergent 

 below ; clypeus small, separated at base,, truncate at apex, weakly im- 

 pressed and narrowly reflexed at apex ; malar space as long as basal 

 width of mandible; vertex narrow, ocell-ocular line much shorter 

 than diameter of ocellus ; temples narrow, and very sharply receding ; 

 antennae as long as body ; flagellum very slender, its basal joint half 

 as long again as second and fully ten times as long as thick. Thorax 

 polished, without sculpture and almost without pubescence; notauli 

 deep anteriorly; propodeum dorsally finely transversely aciculate, 

 laterally very finely granularly opaque, posteriorly polished without 

 carinae, but with prominent ridges on each side of petiolar area ; tib- 

 iae and tarsi opaque and densely pubescent, legs otherwise polished 

 and without vestiture; abdomen finely coriaceous, subopaque; ter- 

 gites 1-5 with subapical transverse impressions, deep at sides and 

 obsolescent in middle; first tergite without carinae and with the 

 basal impression short. 



Black; propodeum and abdomen aeneous; wings deeply infumate; 

 legs black with purple reflections, extreme base of front and middle 

 femora, hind femur except apex and apical joint of its trochanter fer- 

 ruginous. 



