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Triepeolus michiganensis Mitchell, 1962
Life   Insecta   Hymenoptera   Apoidea   Apidae   Triepeolus
Subgenus: None

Triepeolus michiganensis FEM mm .x ZS PMax
© Copyright Laurence Packer 2014 · 7
Triepeolus michiganensis FEM mm .x ZS PMax

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Triepeolus michiganensis MALE mm .x ZS PMax
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Triepeolus michiganensis f 12-07-21 0013
© Copyright Micheal Veit 2010 · 6
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Triepeolus michiganensis f 12-07-21 0019
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Triepeolus michiganensis f 12-07-21 0021
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Triepeolus michiganensis, female, dorsal habitus
© Molly Rightmyer · 1
Triepeolus michiganensis, female, dorsal habitus
Overview
Reprinted with permission from: Rightmyer, M.G. A Review of the Cleptoparasitic Bee Genus Triepeolus (Hymenoptera: Apidae)

TRIEPEOLUS MICHIGANENSIS MITCHELL (Figs. 127, 128)

Triepeolus michiganensis Mitchell 1962: 473–474 [Holotype: U. S. National Museum of Natural History No.75244; female, Shiwassee Co., Michigan; 3 September 1950].

Description.—Length ca. 8–9 mm; ITW 1.9–2.0 mm. Integument black, with red to orange on apical mandible, labrum, entirely or basally on antenna, and partially on legs, sometimes on tegula, rarely on pronotal lobe; dorsum of mesosoma and metasoma with bands of pale gray to white setae. Clypeus with distinct midline and vague larger punctures, asetose or covered with medially-directed white setae (denser on basal half, especially in males). Paramedian band clearly separated from other pale setae on mesoscutum (females) or connected laterally to areas of diffuse setae on anterior margin of mesoscutum (males). Scutellum moderately to strongly bigibbous; axillar spine triangular, not incurved apically, reaching scutellar midpoint. Mesepisternum lacking erect, simple setae; punctures nearly contiguous to separated by one puncture diameter; with white, branched setae mostly restricted to dorsal half to fourth of lateral surface (absent on hypoepimeron) as well as anterior surface (males with setae denser). T1 discal patch widely trapezoidal; T2 with LLB forming acute angle with ATB; T1–T3 with ATBs interrupted medially. Female: Pseudopygidial area subquadrate, with distinct basal crescent of silvery shining setae; S2–S4 with white appressed setae on apical margin; S5 very slightly downcurved apically or straight. Male: Pygidial plate of moderate size with slight emargination on lateral margins and weak or strong basal transverse ridge; S2–S4 with white setae on apical margins; S4–S5 with brown apical fringes (white laterally on S4).

Comments.—The males of this species are similar to T. obliteratus, but T. obliteratus lacks the midline on the clypeus, and the apical transverse setae on T1–2 are only slightly interrupted medially (in T. michiganensis, the setae are well-separated medially on T1–2, and slightly interrupted medially on T3). Females are recognized by the combination of their small size, bands of white setae on the metasoma, and the distinct basal crescent of shining setae on the pseudopygidial area.

Distribution.—USA: Michigan, New Hampshire, New York.

Host Records.—Melissodes (Eumelissodes) denticulata Smith (John S. Ascher, in lit., 2003, observation of nesting site).

Floral Records.—Solidago sp.

Seasonal Records.—26 July to 3 September.

Specimens examined.—5 female, 2 male (ITHACA, NEW YORK-ASCHER, PHILADELPHIA, WASHINGTON D.C.).

Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.

FEMALE—Length 8 mm.; black, mandibles ferruginous, blackened at tips, tegulae testaceous, tarsi brownish-testaceous, tibiae testaceous with piceous infusions, femora and mid and hind spurs largely piceous, tubercles black; basal segment of flagellum much shorter than segment 2 which is considerably longer than broad, following segments piceous beneath, black above; space between margin of vertex and lateral ocelli slightly less than their diameter; cheeks about half width of eyes, somewhat narrower below, hind margin subcarinate; median length of labrum slightly greater than half the breadth, with a pair of small, apical, submedian denticles; posterior margin of scutellum strongly outcurved, with a rather deep median impression, free part of axillae quite short, tips just reaching mid transverse line of scutellum (similar to cressonii, fig. 112); wings very lightly infuscated basally, becoming somewhat more deeply so apically, with the usual three submarginal cells, veins testaceous to piceous; face with a small amount of appressed silvery tomentum around bases of antennae, with more erect but quite thin, pale pubescence above; margin of pronotum quite densely whitish tomentose, tubercles with a marginal fringe, scutum with a pair of narrow, elongate lines of pale tomentum anteriorly, sparsely fringed with the same laterally and in scutello-mesothoracic suture; anterior face of pleura above quite densely pale tomentose, and with a narrow, transverse, tomentose line to the mid coxae; metanotum and adjacent margin of scutellum quite densely whitish tomentose, terminating laterally in a tuft of elongate, whitish hairs back of wing bases; basal abdominal tergum whitish tomentose across anterior face, this slightly interrupted medially, with an apical tomentose fascia, median black tomentose patch broadly quadrangular, the basal and apical tomentose areas narrowly united at extreme sides, the apical fascia narrowly interrupted medially and slightly separated from rim of the tergum; terga 2-4 with transverse, apical, tomentose fasciae, but slightly interrupted, if at all on 2, slightly separated from the yellowish rims on 2 and 3, tergum 2 with a narrow whitish tomentose patch on each extreme side reaching from the fascia nearly to the base; tergum 5 with a triangular patch of whitish tomentum on each side of pseudopygidium; punctures of tegulae fine and quite close on inner margin, becoming narrowly impunctate on outer rims; punctures of face above antennae very coarse, deep and quite close but not crowded, becoming somewhat finer and more densely crowded across vertex and on cheeks, densely and finely punctate below antennae, clypeus with a median, impunctate line from base to center, surface with scattered, shallow, rather coarse punctures superimposed on the finely punctate field; scutum, scutellum and axillae quite coarsely, closely, deeply and evenly punctate, the punctures almost crowded; pleura below with some irregular shining spaces, the punctures becoming densely crowded toward the tomentose patch above, the area above this patch and below wing bases very coarsely, deeply and distinctly punctate; discs of abdominal terga beneath the black tomentum with close, fine, evenly distributed punctures, becoming slightly finer, closer and deeper on tergum 5; pseudopygidium about as long as its apical width, broadly rounded apically, covered with short, fine, suberect, brownish setae; sternum 5 broadly convex as seen from beneath. MALE—Similar to female in most respects, but segments of flagellum shorter, length about equal to breadth; legs somewhat darker, with only the tarsi definitely testaceous; terga 5 and 6 with transverse, apical, pale tomentose fasciae, that on 6 rather short; pygidial area strongly elevated above disc of tergum 7, carinate laterally, apical area beyond transverse ridge slightly longer than broad, surface with a few shallow, irregular and obscure pits.


Names
Scientific source:

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Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Rudbeckia hirta @ CUIC_ENT (2)

Solidago @ AMNH_BEE (1); CUIC_ENT (2)

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Updated: 2024-03-28 20:32:42 gmt
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