352 AMERICAN HYMENOPTERA. 



Trogiis apicatns n. sp. 



% .■ — 15 mm. Black, with the. abdomen deep blue ; tibiae and tarsi, anterior 

 femora and apex of middle femora fulvous ; wings fuliginous, purple reflection^ 

 and with a large white spot on the apex of each primary wing ; nervures varying 

 from reddish to black, stigma black; thorax punctured ; prothorax, upper plenra 

 and base of metathorax sparsely so ; rest of metathorax strongly rugose, espe- 

 cially the median area, which is long and with a central longitudinal ridge, basal 

 transverse carina prominent; scutellum conical with the apex bent backwards; 

 abdomen broad, depressed, segments densely rugose and much constricted at base; 

 a distinct median carina extends backward from base of 2. 



One specimen from Crawford Notch, N. H. (Mrs. Slosson). In 

 color this species resembles fulvipes Cress., but structurally and in 

 the pale apical spot on the wings it differs considerably. 



Flatylabus incabus n. sp. 



9- — 9 mm. Black, with abbreviated anterior orbits, cheeks around base of 

 mandibles, tegulse, spot before, apex of scutellums and small annulus on antennse, 

 distinctly white, but small ; legs clear ferruginous, with hind tarsi and extreme 

 apex of hind tihife black ; wings hyaline, nervures brown, stigma black ; antennae 

 long, slender, brown, with yellowish pubescence; body punctured, subpolished; 

 scutellum with distinct, elevated lateral carinse ; metathorax with median and 

 two lateral apical areas transversely reticulate; superior area glabrous; tergum 

 of petiole polished, of postpetiole shagreened ; abdomen depressed, ovipositor 

 slightly exserted ; legs large and strong. 



One specimen from Moscow, Idaho (Prof. Aldrich). 



Platylabus bakeri n. sp. 



%. — 7 mm. Rufous, with head, prothorax, mesonotum and abdomen beyond 

 second segment, black ; broad orbital lines interrupted below, face except black 

 transverse spot above clypeus, clypeus excei)t central apical s])ot, mandibles, palpi, 

 scape beneath, collar, humeral line, line beneath each wing, stripes on disc of 

 mesonotum, scutellums, spots on posterior and anterior mesoi)leur{e, two spots on 

 metathorax above hind coxae, broad apical margin on all abdominal segments, 

 more or less of four anterior coxae and trochanters and annulus on antennae, 

 white ; hind legs with their femora at apex, apical third of tibiae behind and their 

 tarsi piceous to black ; antennae dark brown, long as body; wings hyaline, ner- 

 vures and stigma brown, areolet subsessile above; body punctured, subpolished ; 

 scutellum with strong lateral carinae ; metathorax rugose, superior area subpol- 

 ished, apical areas irregularly reticulate, petiole of abdomen very broad, finely 

 and rather sparsely punctured. 



One specimen from Howard Baker, of Ann Arbor, Mich., and 

 dedicated to him for the interest he has taken in collecting specimens 

 in this family. 



Platylabus foxi n. sp. 



% . — 8 mm. Head and thorax black ; dorsum of three basal segments of ab- 

 domen, extreme apex of hind tit)iae. three apical segments of hind tarsi and most 

 of antennae opaque ])iceous; rest of legs and abdomen mostly rufous; face, scape 

 beneath, annulus on antennae, broad orbits, cheeks, mouth-parts, collar, most of 



