Dufourea dilatipes Bohart, 1948

Dufourea dilatipes Female	Dufourea dilatipes Male

Dufourea dilatipes Bohart, 1948:135 (♂, ♀ description).

Diagnosis.The main diagnostic characteristics of this species are brown body pubescence, longer clypeus, dull propodeal triangle and densely punctate mesoscutellum. Those observed only in the male are the robust hind femur and triangular hind tibia, S4 with medial process on apical margin, S6 with medial process gradually curved. This species is similar to D. maura in its robust body and wide head (D. maura generally larger), however the latter has black body pubescence, shorter clypeus, shiny propodeal triangle, and sparsely mesoscutellum; the male has simple hind legs and S6 with process angulate.

FEMALE: Length 9 mm.

Head:

Dufourea dilatipes female head

1) head considerably broader than long, 1.24:1; inner margin of compound eyes subparallel; OVD = 4.5MOD, OOD = 3MOD, IOD = 2MOD. 2) supraclypeal area shiny, nearly flat in lateral view, with slightly elevated midline; clypeus mostly shiny, nearly twice as broad as long, its apical margin convex, strongly protuberant in lateral view; labrum slightly broader than long, partly hidden when mandibles are closed. 3) mandible bi-dentate. 4) genal area nearly as wide as compound eye in lateral view. 5) pubescence brown, long and moderately thick, hairs longest and most dense on vertexal area, scape, between antennal bases, and on clypeus, though never obscuring surface below; vertex with a row of yellow hairs along posterior vertexal area; supraclypeal area nearly bare on apical half. 6) clypeus with punctures of two sizes, larger punctures coarse, deep and well separated (

Mesosoma:

8) mesoscutum with pubescence long, thin, and pale brown, longest on mesopleuron, mesoscutellum, and lateral propodeum. 9) mesoscutum somewhat shiny, punctures of two sizes: smaller punctures fine, close laterally (≤1pd), finer and crowded along extreme anterior and lateral margins; larger punctures less dense (2-3pd), becoming sparser on disc around admedian line; mesoscutellum shiny, punctures similar to those of mesoscutum, very fine and crowded apically and laterally, even and sparse on disc; mesopleuron somewhat dull, punctures minute, close and obscure anteriorly, more distinct posteriorly (1-2pd); hypoepimeral area strongly imbricate on upper ¾, punctures dense but becoming sparse toward lower margin; propodeal triangle 2/3 as long as mesoscutellum, imbricate with dense and fine striae, adjacent dorsolateral surface densely punctate (1-2pd), punctures of two sizes, lateral propodeal surface anteriorly shiny becoming dull and imbricate posteriorly, punctures separated by 2-4pd. 10) legs dark brown basally, apical tarsomeres somewhat reddened; tibial spurs, especially the mid and hind, long and slender, yellowish, slightly reddened apically, mid tibial spur about 2/3 as long as mid basitarsus. 11) tegula dark brown, dull, obscurely punctate with a few thick brownish hairs anteriorly, becoming shiny and impunctate posteriorly, with sparse hairs on anterior half. 12) wings lightly infuscated, veins and stigma brownish-red, 1st recurrent vein entering 2nd submarginal cell about half as far from base than distance of 2nd recurrent vein to apex.

Metasoma:

13) terga smooth and shiny, punctures well separated (>3pd), denser basally (

MALE: Length 8.5 mm.

Head:

Dufourea dilatipes male head

1) head much broader than long, 1.23:1; compound eyes very slightly divergent below; OVD = 4.5MOD, OOD = 3MOD, IOD = 2MOD; 2) supraclypeal area nearly flat in lateral view, with slightly elevated midline; clypeus imbricate, slightly protuberant, nearly twice as broad as long; labrum much broader than long. 3) mandible bi-dentate. 4) genal area slightly wider than compound eye, slightly narrowed below. 5) pubescence largely brown between antennae and on scape, clypeus with sparse, thin, erect, brown hairs basally, pale hairs apically, apical margin with dense, long, pale hairs; vertex with a row of yellow hairs along posterior vertexal area; supraclypeal area nearly bare on apical half. 6) punctures of vertexal area fine, less dense medially than on face, with impunctate shiny areas along outer margin of lateral ocelli and anterior to median ocellus, genal area closely and obscurely punctate above, becoming shiny and nearly impunctate below and around compound eye margin; punctures below ocelli fine and densely crowded (2pd); supraclypeal area densely pubescent between antennae (

Mesosoma:

8) pubescence pale brown, with a few pale hairs on mesopleuron and lateral propodeum, largely brown on mesoscutum and mesoscutellum, longest on mesopleuron, lateral mesoscutellum, and lateral propodeum. 9) mesoscutum and mesoscutellum somewhat shiny, very finely and closely punctate, punctures somewhat separated on discs (2-3pd), becoming denser, but not crowded, at extreme sides (1pd); mesoscutellum with a median depression most strongly pronounced anteriorly; mesopleuron dull, mostly smooth, punctures minute and rather vague, hypoepimeral area strongly imbricate on upper ¾, punctures dense but becoming sparse toward lower margin; propodeal triangle 2/3 as long as mesoscutellum, imbricate, finely rugosostriate, adjacent dorsolateral surface densely punctate (1-2pd); lateral propodeal surface anteriorly shiny becoming dull and imbricate posteriorly, punctures separated by 2-4pd. 10) legs dark brown, hind trochanter triangularly produced ventrally; hind femur robust, greatest width about ¾ length; hind tibia robust, apical width subequal to length, triangular; hind basitarsus parallel-sided, slightly narrowed basally, outer surface slightly concave; mid tibial spur about 0.7 times as long as mid basitarsus. 11) tegula brownish-hyaline, anterior third densely punctate becoming shiny and nearly impunctate posteriorly, with sparse hairs on anterior half. 12) wings lightly infuscated, veins and stigma brownish-red; 1st recurrent vein entering 2nd submarginal cell about half as far from base than distance of 2nd recurrent vein to apex.

Metasoma:

13) terga somewhat shiny, minutely punctate, punctures more dense and fine on basal area (2-3pd) becoming more sparse apically; T1-T4 with small punctures dispersed among large ones; apical impressed areas entirely impunctate, more or less reddened, becoming slightly yellowish hyaline on apices; discal pubescence suberect, thin and obscure, largely pale on the more basal terga, becoming more erect, conspicuous and dark brown-black on T5-T7. 14) S1-S5 relatively simple, S3 medially depressed with a lateral spine, S4 with ventrally directed triangular flange on apical margin medially, with lateral spine as in S3, S5 medially depressed, apical margin broadly and deeply concave, S6 with medial subtriangular area flattened and shiny, with large medial process gradually curved and densely pubescent.

Genitalia: Dorsal view
Ventral view

Dufourea dilatipes genitalia, dorsal view

Dufourea dilatipes genitalia, ventral view

Distribution:

In Canada, this species is known from Waterton Lakes National Park in southwestern Alberta and adjacent British Columbia (see Map).

Map: Canadian distribution of Dufourea dilatipes