Identification Summary: Large; head wide; scutum coarsely rugose in part; mesepisternum coarsely rugose; dorsal and posterior surfaces of propodeum delimited by a strong and complete carina, similar to L. nymphaearum.
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 7 mm.; head greenish- blue, thorax entirely blue, abdomen blackish, with some faint, metallic reflections across center of terga; pubescence short, thin, entirely white; head considerably broader than long; clypeus broadly convex, projecting about one- half below suborbital line; supraclypeal area strongly convex, thus considerably elevated above surrounding areas of face, somewhat broader than long and only slightly shorter than clypeus; eyes very slightly convergent below; lateral ocelli slightly nearer eyes than to each other; cheeks subequal to eyes in width; face below ocelli rather dull, finely rugoso-punctate, becoming smooth and minutely and obscurely punctate on the shining vertex; cheeks above shining, very minutely and obscurely punctate, becoming rather finely striate toward lower surface, but this quite smooth and shining, with a few scattered shallow punctures; hypostomal carinae parallel, apical angle broadly rounded; lower half of face somewhat shining, punctures quite deep and distinct, well separated but not at all sparse, those on clypeus fine and close along upper third, becoming more coarse and sparse toward apical margin, apical half blackened; scutum somewhat shining medially, with coarse, deep and rather close punctures, becoming very coarsely rugoso-punctate or reticulate laterally (fig. 99), scutellum dull, punctures irregular on each side, more finely rugoso-striate medially; pleura very coarsely reticulate above, becoming somewhat more striate below; dorsal area of propodeum coarsely striate, posterior face quite smooth, almost completely encircled with a salient rim, lateral faces rather dull, rather coarsely striate; wings faintly infuscated, veins and stigma brownish testaceous; tegulae reddish-piceous, becoming yellowish-hyaline along anterior margin; legs piceous, only very slightly paler on tarsi apically; abdominal terga shining, punctures exceedingly minute and obscure, basal tergum practically impunctate, 2nd and 3rd with rather close and very faint punctures across base, these nearly disappearing apically, apical margins rather broadly but slightly impressed, concolorous with basal areas.
MALE—Length 6.5 mm.; head and thorax blue, with some greenish tinges, abdomen piceous; pubescence rather short, thin, erect, entirely pale, becoming somewhat dense around lower part of face; head considerably broader than long; clypeus nearly three times broader than long, projecting about one-half below suborbital line, supraclypeal area somewhat shorter than clypeus; eyes but very slightly convergent below; lateral ocelli subequally distant from eyes and each other; antennae also about equally distant from eyes and each other, basal segment of flagellum slightly longer than pedicel, following segments much longer than broad (ratio about 1.5 to 1), brownish beneath, piceous above; labrum transverse, more or less testaceous; mandibles very long, slightly curved, tip of one reaching base of other when closed, largely testaceous, with darker base and a slender, reddish tip; cheeks broad, angulate or tuberculate below, the angle opposite lower third of eye; upper part of face densely and rather coarsely rugoso-punctate near center below ocelli, becoming more distinctly separated on each side toward eyes, lower portion deeply, coarsely and not so closely punctate, supraclypeal area somewhat shining, with numerous, irregular and rather shallow punctures; clypeal punctures very fine and rather close, becoming somewhat more sparse toward apical margin; vertex shining, punctures between eyes and ocelli exceedingly minute, cheeks above shining, minutely and obscurely punctate, becoming rather coarsely striate and dull toward the inferior angle; hypostomal carinae about parallel, apical angle broadly rounded, surface on each side smooth but rather dull; scutum and scutellum shining, coarsely and deeply punctate, punctures quite sparse over central area of scutum and scutellum, becoming rather close between notaulices and tegulae; pleura coarsely reticulate; dorsal area of propodeum with coarse, complete and rather regular striations, hind margin of area quite distinct, lateral faces rather coarsely striate; wings subhyaline, veins and stigma brownish-testaceous, 2nd submarginal cell very short, much shorter than 3rd, receiving 1st recurrent vein at apex; tegulae testaceous-hyaline; femora and tibiae entirely dark, all the tarsi pale testaceous; abdominal terga smooth and shining, microscopically punctate punctures rather uniformly and generally distributed, apical impressed areas rather short, entirely impunctate, largely dark, discal pubescence very short and inconspicuous, not obscuring apical terga to any degree; apical margin of sternum 5 straight; median lobe of sternum 7 triangularly acute (much as in halaphitus or tamiamensis, fig. 101); retrorse lobe quite strongly attenuated apically, the gonostylus quite similar to that in reticulatus (fig. 102).
DISTRIBUTION—Nebraska and Minnesota to Illinois, south to Louisiana and North Carolina; May to August.
FLOWER RECORDS—Anthemis, Engeron, Hypericum, Rorippa, Rubus and Vicia.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) hartii (Robertson)
Halictus hartii Robertson, 1892: 268. ♀.
Holotype. ♀ USA, Illinois [INHS: Hart #17211]. Lost (Webb 1980).
Halictus rugosus Crawford, 1902a: 237. ♀ ♂.
Holotype. ♀ USA, Nebraska, Nebraska City,, 12.ix.1901, on Solidago (M.A. Carriker); [NMNH: 8233]. Examined.
Taxonomy.Michener, 1951: Lasioglossum (Chloralictus) hartii, p. 1114 (catalogue); Mitchell, 1960: Dialictus hartii ♀♂,
p. 396 (redescription); Krombein, 1967: Lasioglossum (Dialictus) hartii, p. 463 (catalogue); Moure and Hurd, 1987:
Dialictus hartii, p. 102 (catalogue)
Diagnosis. Both sexes of L. hartii can be recognised by the following diagnostic combination: mesoscutum coarsely
rugose, punctures distinct only medially (Figs. 127, 129) and pronotal ridge carinate. Male L. hartii often can be further
distinguished by gena with strong tubercle and mandible elongate, extending to opposing mandibular base (Fig. 128B).
Redescription. FEMALE. Length 6.05–6.29 mm; head length 1.58–1.85 mm; head width 1.82–2.03 mm; forewing
length 4.30–4.66 mm.
Colouration. Head and mesosoma blue, with greenish reflections. Clypeus with apical half blackish brown,
basal half and supraclypeal area bronze. Antenna blackish brown, flagellum with ventral surface dark reddish
brown. Tegula dark reddish brown. Wing membrane faintly dusky, venation and pterostigma amber. Legs brown,
except tarsi reddish brown. Metasoma blackish brown, terga and sterna with apical margins reddish.
Pubescence. Dull to yellowish white. Relatively sparse. Head and mesosoma with moderately dense woolly
hairs (1–1.5 OD), longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Paraocular area with sparse
subappressed hairs. Gena without tomentum. Propodeum with dense plumose hairs on lateral and posterior surfaces
(2–2.5 OD). Metasomal terga with sparse, fine hairs. T1 acarinarial fan with dorsal opening. T2–T3 with at
most sparse tomentum basolaterally. T2 apicolateral and T3–T4 apical margins without fringes.
Surface sculpture. Face weakly imbricate, punctation coarse. Clypeus polished, basal margin imbricate, punctation
dense (i≤d). Supraclypeal area with punctation dense (i≤d). Lower paraocular with punctation moderately
dense (i≤d). Antennocular area reticulate. Upper paraocular area and frons rugulose. Ocellocular area polished,
finely punctate (i=1–1.5d). Gena carinulate and postgena imbricate. Mesoscutum coarsely rugose imbricate, punctation
separated only medially (i≤d). Mesoscutellum similar to mesoscutum, submedial punctation moderately dense (i=1–1.5d). Axilla punctate. Metanotum rugulose. Preëpisternum, hypoepimeral area, mesepisternum, and metepisternum strongly rugose. Metapostnotum rugoso-carinulate with broad polished areas between rugae.Propodeum strongly rugose, except posterior surface rugulose-imbricate. Metasomal terga polished except marginal areas faintly coriarious, punctation very fine dense (i=1.5–2.5d), apical margins narrowly impunctate.
Structure. Head very wide (length/width ratio = 0.87–0.89). Eyes weakly convergent below (UOD/LOD ratio =1.09–1.15). Clypeus 2/3 below suborbital line, apicolateral margins convergent. Supraclypeal area strongly protuberant. Antennal sockets close (IAD/OAD < 0.6). Frontal line carinate, ending <2 OD below median ocellus. Gena
narrower than eye. Pronotal ridge carinate, interrupted by oblique sulcus. Inner metatibial spur pectinate with 3–4 branches. Metapostnotum posterior margin sharply angled, nearly carinate. Metapostnotum moderately truncate (MMR ratio = 1.31–1.43), posterior margin carinate. Propodeum with oblique carina very strong, lateral carina strong reaching dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length. 5.63–6.11 mm;
head length 1.44–1.70 mm; head width 1.61–1.92 mm; forewing length 3.81–4.36 mm.
Colouration. Mandible yellow. Flagellomere with ventral surface orange-yellow. Legs brown, except tarsi yellowish
Pubescence. Lower paraocular area with dense tomentum. Face below antennal sockets otherwise with sparse subappressed
tomentum, partially obscuring surface. S4 apicolateral and S4 lateral portions with posteriorly directed tufts
Surface sculpture. Mesoscutal punctures more distinct between parapsidal lines (i=1–1.5d).
Structure. Head wide (length/width ratio = 0.89–90). Eyes weakly convergent below (UOD/LOD ratio = 1.07–1.17).
Mandible elongate, nearly reaching opposing mandible base. Clypeus 1/2 below suborbital line, apicolateral margins subparallel.
Antennal sockets distant (IAD/OAD > 1.0). Frontal line carinate, ending 1.5 OD below median ocellus. Pedicel
shorter than F1. F2 length 1.4–1.7X F1. F2–F10 elongate (length/width ratio = 1.57–1.64). Gena often with large triangular
tubercle. Pronotal dorsolateral angles acute. Pronotal ridge carinate, uninterrupted. Metapostnotum moderately truncate
(MMR ratio = 1.27–1.35), posterior margin sharply angled onto posterior surface. Propodeum with less evident
oblique and lateral carinae.
Terminalia. S7 with median lobe very narrow, acuminate (Fig. 130). S8 with apicomedial margin strongly convex
(Fig. 130). Genital capsule as shown in Fig. 130. Gonobase with ventral arms narrowly separated. Volsella roughly ovoid.
Gonostylus elongate, dorsal setae elongate. Retrorse lobe elongate, attenuated apically.
Range. Minnesota, south to Alabama, Texas (Fig. 82). USA: AL, AR, IL, LA, MI, MN, MO, NC, TX.
Additional material examined. USA: ALABAMA: 1♀ Decatur, viii.1944 (G.E. Bohart) [BBSL]; ARKANSAS:
1♀ Clinton Co., 10 mi NE Dewitt, 27.viii.1967 (D.P. Gregory); [CUIC]; IOWA: 1♀ Louisa Co., Columbus Junction;
[CUIC]; LOUSIANA: 2♀♀ Tallulah, iv. [NMNH]; MICHIGAN: 1♀ Saginaw Co., N43.34275 W84.10839, 25.vi.2009,
(Tuell et al.); [PCYU]; MINNESOTA: 1♀ Houston Co., 21.v.1938 (P. Nicholson); [NCSU]; MISSOURI: 1♀ Lincoln
Co., NE Elseberry on Mississippi, 26.viii.2001 (Arduser); 1♀ Perniscot Co., 4 mi S of Portageville, 25.ix.2004 (Arduser);
[PCYU]; NEBRASKA: 1♀ (H. rugosus paratype) Nebraska City, 19.v.1901 (M.A. Carriker); 1♂ (H. rugosus paratype)
Nebraska City, 12.ix.1901 (M.A. Carriker); [NMNH]; NORTH CAROLINA: 2♀♀1♂ Hyde Co., 28.v.1957 (T.B. Mitchell);
[CUIC]; 1♀1♂ Hyde Co., 27.v.1957 (T.B. Mitchell); 1♀24♂♂ Hyde Co., 28.v.1957 (T.B. Mitchell); [NCSU];
TEXAS: 1♀2♂♂ Liberty, 22.vi.1917 (C.U. Expedit.); [CUIC].
Floral records. ASTERACEAE: Anthemis, Erigeron, Solidago, Vernonia; BRASSICACEAE: Capsella, Rorippa;
CLUSIACEAE: Hypericum; FABAEAE: Vicia; ONAGRACEAE: Gaura longiflora; ROSACEAE: Rubus.
DNA Barcode. Available. Multiple sequences.
Comments. Uncommon. Lasioglossum hartii is widely distributed in the eastern United States but uncommonly collected.
This species has a preference for wetland areas (M. Arduser, in litt.).