FEMALE: Length 7.5-8 mm.

Head:

1) head slightly broader than long, 1.13:1; compound eyes subparallel; OVD = 1MOD, OOD = 2MOD, IOD = 2.4MOD. 2) supraclypeal area slightly protuberant between antennae; clypeus strongly protuberant, considerably broader than long, with apical margin curved; labrum much broader than long, almost fully exposed, mandibles fitting beneath the large labral process when closed. 3) mandible bi-dentate. 4) genal area above narrower than compound eye, slightly narrower below. 5) pubescence quite thin and inconspicuous, largely whitish, but some dark erect hairs on vertexal area, frontal area below ocelli, and on antennal scape, longest on genal area, lower paraocluar area, antennal scape, and apical margin of clypeus. 6) punctures deep, distinct and close on upper part of face below ocelli (≤1pd), becoming more sparse on paraocular area where the surface is shiny (1-2pd); very fine and close (≤1pd) on the slightly convex supraclypeal area, becoming smaller and crowded laterally, slightly more sparse medially (>2pd); clypeus with punctures coarse and deep, separated by 1-3pd; punctures minute and slightly separated over most of vertexal area (1-2pd), coarser medially; upper part of genal area with punctures fine and separated by 1-2pd, lower surface of genal area lateral to hypostomal carina shiny with punctures much more sparse (>2pd). 7) IAD subequal to AOD, antennal socket separated from upper margin of clypeus by its diameter; flagellar segments considerably broader than long except for F10, as broad as long.

Mesosoma:

8) pubescence short and copious on mesoscutum laterally and apically, otherwise quite thin and inconspicuous, largely pale, longest on metanotum, mesopleuron, and on lateral propodeum. 9) mesoscutum shiny, punctures fine, and dense (~1pd), becoming sparser in center of disc posteriorly (2-3pd), but not crowded even between parapsidal line and and tegula; mesoscutellum shiny, punctures large and well separated (2-3pd), with a dense medial line of smaller fine punctures, these also dense near basal margin (≤1pd); mesopleuron somewhat shiiny, punctures of two sizes, larger punctures deep and sparse (≥2pd), smaller punctures shallow and more dense, especially near posterior margin; hypoepimeral area shiny, punctures denser above (2-3pd) becoming sparse toward lower margin, lowermost area nearly impunctate; propodeal triangle about half as long as mesoscutellum, shiny and finely striate or reticulate; lateral and posterior propodeal minutely imbricate, becoming coarser posterolaterally, anterior third of lateral surface with punctures very minute, otherwise with sparse coarse punctures (2-3pd), denser on upper posterior surface (1-2pd). 10) legs dark basally, becoming somewhat reddened on the more apical tarsal segments; spurs, especially the mid and hind pair, very long and slender, yellowish at base, becoming reddened apically; mid tibial spur with few distinct and well separated teeth. 11) tegula dark in large part, shiny, densely and finely punctate on anterior third, becoming posteriorly impunctate; long pale yellow hairs on anterior and inner margins. 12) wings lightly infuscated, veins and stigma more brownish-red, 1st recurrent vein entering 2nd submarginal cell closer to base than distance of 2nd recurrent vein to apex.

Metasoma:

13) terga quite smooth and shiny, with minute and dense punctures; T1-T3 with dense punctures basally (~1pd) becoming sparser apically (>2pd); T4-T5 with punctures somewhat coarser, separated by 1-3pd; apical impressed areas yellowish-hyaline, with minute and sparse punctures; T2-T5 with white basal hair bands,T4 -T5 with dense hairs on apical impressed area, these also present on T2-T3 only laterally; discal pubescence very short and obscure, suberect, pale, longest on lateral T4 and disc of T5. 14) sterna with basal half impunctate, apical half punctate (1-3pd; S2 slightly depressed beyond basal margin, forming a ridge centrally.

MALE: Length 7 mm.

Head:

1) head slightly broader than long, 1.14:1; compound eyes very slightly convergent below; OVD = 1.5MOD, OOD = 2.3MOD, IOD = 2MOD. 2) supraclypeal area strongly protuberant between antennae, flat below; clypeus strongly protuberant, broader than long; labrum broader than long, shiny and apically rounded, entirely exposed by the closed mandibles. 3) mandible bi-dentate. 4) genal area narrower than compound eye and very much narrowed below. 5) pubescence whitish on face, only few dark hairs evident on antennal scape; dense on clypeus and supraclypeal area, entirely covering surface below, slightly less dense on paraocular area and scape; longest on genal area, scape, and vertexal area. 6) punctures deep, distinct and densely crowded on upper part of face below ocelli (≤1pd), sparser on paraocular area (1-3pd); the strongly convex supraclypeal area densely pubescent below antennae, punctures fine and dense (≤1pd), largely hidden beneath the pale pubescence, slightly more separated between antennae and directly above; clypeus with coarse and close punctures beneath the dense pubescence (<1pd); punctures of vertexal area coarse, somewhat more obscure medially than on face and separated by 1-2pd, with impunctate area along outer margin of lateral ocelli larger than in female; genal area shiny, punctures fine and well separated posteriorly (1-2pd), becoming very sparsely punctate anteriorly (>3pd). 7) IAD subequal to AOD, antennal socket separated from margin of clypeus by more than its diameter (1.5X); F1 slightly longer than broad, nearly twice as long as pedicel and as long as F2, F2 slightly longer than broad, median segments with breadth subequal to length, apical segments slightly longer, F1-F5 with ventral fringe of short, bent hairs, F4-F11 with smooth basal depression.

Mesosoma:

8) pubescence pale whitish throughout, longest on mesopleuron, pronotal lobe, and posterior metanotum; short dense hairs on apical mesoscutum; mesoscutellum with hairs short and sparse basally, becoming dense and long apically and laterally. 9) mesoscutum shiny, closely punctate (1-2pd) becoming somewhat sparser on disc (2-3pd); mesopleuron smooth and shiny, punctures minute posteriorly, but coarser anteriorly; hypoepimeral area shiny, punctures fine and dense (1-3pd), becoming sparser toward lower margin where surface is impunctate; propodeal triangle 0.6 times length of mesoscutellum, shiny and rugosostriate; lateral propodeal surface anteriorly shiny becoming strongly imbricate posteriorly, punctures sparse and obscure, posterior propodeal surface shiny becoming minutely imbricate below, punctures well separated (2-4pd). 10) legs black-black; fore and hind trochanter produced beneath, wedge-shaped; hind femur robust and rounded; hind tibia basally slender, becoming somewhat club-shaped apically, mid tibial spur about half as long as mid basitarsus; hind basitarsus apically widened, about 1.5 times as long as apical breadth, much shorter than tibia. 11) tegula shiny brown; finely punctate on inner anterior half (2-3pd), punctures becoming sparse posteriorly and towards outer edge; with long white hairs on outer anterior half and some short hairs on posterior edge. 12) wings lightly infuscated, veins and stigma brownish-red, recurrent veins entering 2nd submarginal cell about equally distant from base and apex.

Metasoma:

13) terga shiny, punctures of two sizes, smaller punctures minute and extremely fine, larger punctures deeper, dense basally (<2pd) becoming well separated in apical 2/3 (2-4pd); apical depressed area impunctate, hyaline-yellow; discal pubescence suberect, entirely pale whitish, forming apical fasciae, sometimes medially interrupted on T2-T3, entirely absent on T1. 14) sterna shiny, punctures fine medially becoming deeper and more distinct laterally where punctures are evenly distributed by ≤2pd; S1-S5 relatively simple, S2-S4 with lateral swellings, very weak on S2, S4 with a medial depression, apical margin of S5 with a medial process with long, thin, white pubescence on apex, S6 with a medioapical process, ventrally concave, with apex pointed.

Genitalia: Dorsal view Ventral view

Dufourea trochantera genitalia, dorsal view

Dufourea trochantera genitalia, ventral view

Distribution:

In Canada, this species is known from southern British Columbia (and probably Alberta) (see Map).