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© Copyright source/photographer
· 9
Dufourea marginata, female, face clean |
© Copyright source/photographer
· 9
Dufourea marginata, male, back, clean |
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© Copyright source/photographer
· 9
Dufourea marginata, male, face, clean |
© Copyright source/photographer
· 9
Dufourea marginata, male, side clean |
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© Copyright source/photographer
· 9
Dufourea marginata female side clean |
Jelle Devalez · 1
Dufourea marginata |
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Overview |
Reprinted with permission from: Mitchell, T.B. 1960 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 141.
FEMALE�Length 8-9 mm.; black; pubescence pale ochraceous, rather copious on thorax; length and breadth of head about equal; eyes subparallel; clypeus short and very broad, not markedly convex or protuberant; labrum much broader than long, largely occupied by the truncate labral process; mandibles with a distinct, inner, subapical tooth; cheeks slightly narrower than eyes, much narrowed below; lateral ocelli subequally distant from eyes and each other; antennae slightly nearer each other than to eyes, separated from upper margin of clypeus by a space not much wider than diameter of antennal fossa; punctures on upper part of face very fine and close, densely crowded medially, becoming much more coarse and rather sparse on each side below, supraclypeal area not markedly convex, covered with minute and very close punctures, those on clypeus very fine and close on upper half, becoming somewhat coarser below, but apical third largely impunctate; punctures of vertex uniformly very fine and densely crowded, becoming somewhat more distinct but very minute on cheeks above, lower part of cheeks more shining, punctures somewhat more distinct and more widely separated; scutum dull, densely tessellate, punctures exceedingly minute and hardly visible, those on scutellum very fine and close, somewhat more distinct; pleura shining, finely and quite closely punctate beneath the rather elongate but thin pubescence; dorsal area of propodeum about equalling width of the scutellum, very finely rugoso-striate, but becoming smooth along apical and lateral margins, lateral and posterior faces somewhat shining, with minute but very obscure punctures; tegulae dull testaceous-hyaline; wings whitish, veins and stigma pale testaceous, recurrent veins entering 2nd submarginal cell subequally distant from base and apex; legs dark, with copious, ochraceous pubescence, the more apical, tarsal segments somewhat reddened; abdominal terga smooth but rather dull, minutely and quite closely punctate but not crowded on the more basal terga, becoming more minute and obscure on the more apical terga, but still distinctly separated, apical impressed areas yellowish-hyaline, discal pubescence very short, suberect, entirely pale, becoming more copious on the more apical terga.
MALE�Length 8 mm.; black; pubescence pale ochraceous, quite copious on head and thorax; head very slightly broader than long; eyes short, subparallel; clypeus somewhat protuberant, very broad and short, densely pubescent; labrum shining, much broader than long; mandibles with a distinct, inner, subapical tooth; cheeks above narrower than eyes and much narrowed below; lateral ocelli slightly nearer margin of vertex than to each other and slightly nearer each other than to eyes; antennae somewhat nearer each other than to eyes, separated from upper margin of clypeus by a space somewhat greater than diameter of the fossa, basal segment of flagellum very slightly longer than broad and slightly longer than pedicel, segment 2 about twice as long, following segments somewhat shorter, piceous above, testaceous beneath; face between ocelli and antennae with very fine and densely crowded punctures, these becoming somewhat more coarse and widely separated at sides of face and below; supraclypeal area rather flat, densely pubescent, with very fine and close punctures beneath the pubescence; clypeus with coarse, deep, fine and close punctures beneath dense pubescence; punctures of vertex very fine, close and somewhat obscure medially, becoming somewhat more distinct and deep laterally, cheeks above with minute and very close punctures, becoming somewhat more sparse below; scutum rather dull, punctures very fine, densely crowded over apical half, becoming somewhat more definitely separated and distinct over posterior half; scutellum with a very shallow, median impression, punctures very fine, scattered and irregular, close in general; pleura shining beneath rather elongate pubescence, punctures minute, well separated but hardly sparse; dorsal area of propodeum very finely and irregularly striate, margin rounded and smooth, lateral faces rather smooth and somewhat shining, punctures quite close, minute and rather indefinite; tegulae obscurely reddened, outer margin more yellowish; wings whitish, veins and stigma pale testaceous; legs dark, entirely slender and simple, apical tarsal segments becoming yellowish or testaceous; abdominal terga smooth but rather dull, minutely and rather closely punctate, apical impressed margins yellowish-hyaline, discal pubescence short and obscure, entirely pale even on the more apical terga, becoming rather elongate and dense on tergum 6; sterna 1-5 simple and unmodified; sternum 6 somewhat narrowed apically, with a narrow, compressed, elongate, median process which is densely pubescent and the apical margin with a fringe of long pubescence; sterna 7 and 8 as shown (fig. 127); gonostyli of genital armature slender, somewhat elongate, slightly recurved toward the narrow tips; penis valves slender and elongate, tips slightly curved; cuspis of volsella slender and elongate, with an inner fringe of rather short hairs.
DISTRIBUTION � Minnesota, Wisconsin and Illinois to Mississippi, west to Colorado and Utah; August and September.
FLOWER RECORDS�Robertson (1929) records this species (as Halictoides marginatus) on Bidens aristosa and four species of Helianthus.
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Identification | |
Extracted from: Charles, R. (1895). Notes on bees, with Descriptions of New Species. Transactions of the American Entomological Society Vol. 22, No. 2. pp. 115-128.
Appears as Panurgus autumnalis in this excerpt.
♀- Black, clothed with pale pubescence, which
is rather short and dense on mesonotum ; face finely and densely punctured, except a shining, not depressed, space along the eyes ; clypeus short, very transverse,
truncate ; labrum nearly as large, subquadrate, rounded anteriorly, transversely
striate at base ; flagellum testaceous beneath towards tip ; mesoscutum finely and
densely punctured, disc of metathorax flat, finely sculptured. Wings whitish
hyaline, nervures and stigma pale, submarginal cells of equal length, outer margin
of tegulae dull testaceous. Legs slender, pubescence pale, black, the small tarsal
joints, except the last one, pale. Abdomen somewhat shining, almost impunctate,
with pale pubescence at apex, apical margins of segments broadly pale testaceous.
Length 7-8 mm.
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Updated: 2024-04-25 04:25:48 gmt
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