Identification Summary: Small; long-headed and very similar to L. longifrons; scutum very beaded as if by packed tiny marbles with a few extemely widely scattered pits present.
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 4 mm.; head and thorax green, abdomen more brassy, the terga more or less bluish across center of disc; pubescence short, thin, entirely pale, somewhat dense on posterior portion of abdomen; head slightly longer than broad; clypeus convex, somewhat protuberant, projecting about two- thirds below suborbital line; supraclypeal area elongate, nearly equalling clypeus in length; lateral ocelli subequally distant from eyes and each other; cheeks subequal to eyes in width; face below ocelli dull, punctures very fine and close, quite deep and distinct, becoming obscured laterally on the densely tessellate vertex, cheeks shining, becoming minutely striate below, the hypostomal carinae parallel; lower half of face somewhat more shining, punctures shallow, rather coarse, but well separated, those on supraclypeal area somewhat more sparse and fine, as on upper portion of clypeus, those toward apical margin becoming somewhat more coarse and sparse; scutum and scutellum dull, densely tessellate, distribution of punctures about as in heterognathus (fig. 99), but these shallow and rather vague; pleura dull, finely tessellate, without evident punctures; dorsal area of propodeum dull and tessellate, finely striate laterally, the striae medially very short, except for a central complete one that reaches the rounded apical margin, lateral faces more shining, finely roughened; wings hyaline, veins and stigma yellowish-testaceous; tegulae testaceous-hyaline; legs basally dark, the tarsi becoming somewhat more ferruginous apically; abdomen shining, punctures exceedingly minute and obscure, barely visible, apical margins rather narrowly impressed on sides, pale tomentum of terga 4 and 5 not entirely hiding the surface.
MALE—Length 4 mm.; head and thorax green, abdomen more piceous; pubescence short, thin, entirely pale, rather dense on face below; face considerably longer than broad; clypeus narrow, convex, projecting about two- thirds below suborbital line; eyes convergent below; lateral ocelli subequally distant from eyes and each other; antennae very slightly nearer to each other than to eyes, basal segment of flagellum slightly longer than pedicel, the following segments considerably longer, but the length not twice the breadth; cheeks slightly narrower than eyes; face below ocelli dull, very finely, closely and rather obscurely punctate, punctures becoming somewhat more distinct on vertex laterally, cheeks shining, obscurely and minutely striate below, hypostomal carinae parallel; lower half of face shining beneath the pale tomentum, punctures fine and close, those on supraclypeal area and on clypeus very minute; scutum and scutellum dull, densely tessellate, punctures minute, shallow and rather sparse, somewhat closer at extreme sides; pleura dull, densely tessellate; dorsal area of propodeum rather finely and irregularly rugoso-punctate medially, becoming more regularly striate laterally, lateral areas somewhat shining, very finely rugose; wings hyaline, veins and stigma pale testaceous; tegulae yellowish-hyaline; femora and tibiae piceous, tarsi yellow; abdominal terga shining, punctures minute and rather close, but apical margins impressed and impunctate, rather narrowly so on the more basal terga, but broadly on 3 and 4; apical margin of sternum 5 straight; median lobe of sternum 7 short and broad (much as in creberrimus, fig. 101); gonostylus of armature as shown (fig. 102); retrorse lobe directed more ventrally than posteriorly, thus appearing in a ventral view to be very short, resulting in a superficial resemblance to creberrimus.
DISTRIBUTION—Illinois and Michigan to Massachusetts, south to Florida; April to September, throughout the year in Florida.
FLOWER RECORDS—Asclepias, Aster, Ceanothus, Chrysanthemum, Chrysopsis, Croton, Daucus, Erigeron, Eryngium, Fragaria, Galactia, Gerarclia, Haplopappus, Helenium, Houstonia, Ilex, Koellia, Krigia, Kuhnistera, Laciniaria, Lepidium, Malus, Medicago, Mikania, Oenothera, Opuntia, Plantago, Pyenothymus, Ranunculus, Rubus, Rudbeckia, Salix, Senecio, Solidago, Spiraea and Warea. Robertson (1929) records coreopsis also on Alisma, Capsella, Coreopsis, Polemonium, Symphoricarpus an
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) coreopsis (Robertson)
Chloralictus cereopsis Robertson, 1902b: 249. Lapsus calami.
Chloralictus coreopsis Robertson, 1902b: 250.
Lectotype. ♀ USA, Illinois, Macoupin Co., Carlinville, 23.vi.1891 (C. Robertson); [INHS: 11345] by W. E. LaBerge (in
Webb 1980). Examined.
Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) coreopsis, p. 1113 (catalogue); Mitchell, 1960: Dialictus coreopsis
♀♂, p. 388 (redescription, key, synonymy); Krombein, 1967: Lasioglossum (Dialictus) coreopsis, p. 463 (catalogue);
Moure and Hurd, 1987: Dialictus coreopsis, p. 96 (catalogue).
Diagnosis. Both sexes of L. coreopsis can be recognised by the following diagnostic combination: head elongate
(length/width ratio = 1.09–1.13) (Figs. 79B, 81B) and mesoscutum coarsely tessellate, punctures sparse between
parapsidal lines (i=1–2.5d) (Figs. 80, 82). They are most similar to L. longifrons, which has a much longer head (length/
width ratio = 1.20–1.21) (Fig. 150B).
Redescription. FEMALE. Length 4.00–4.24 mm; head length 1.20–1.30 mm; head width 1.10–1.20 mm; forewing
length 2.72–2.90 mm.
Colouration. Head and mesosoma golden green to bluish green. Clypeus with apical half blackish brown to yellowish
brown. Antenna dark brown, flagellum with ventral surface brownish orange. Tegula brownish yellow. Wings subhyaline,
venation and pterostigma pale brownish yellow. Legs brown, except medio- and distitarsi reddish brown,
metabasitarsus infused with reddish brown. Metasomal terga and sterna golden brown, apical margins pale, translucent
Pubescence. Dull white. 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 and gena with sparse subappressed tomentum. Propodeum
with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately
sparse, fine hairs. T1 acarinarial fan dense, complete, without dorsal opening. T2 basolaterally with sparse
tomentum. T3–T5 with sparse tomentum not obscuring surface. T2–T4 apical margins with sparse fringes.
Surface sculpture. Face imbricate, punctation fine. Clypeus punctation (i=1–2.5d). Supraclypeal area with punctation
moderately dense (i=1–3d). Lower paraocular and antennocular areas with punctation dense (i≤d). Upper paraocular area
and frons punctate-reticulate. Ocellocular area obscurely punctate (i≤d). Gena and postgena lineolate. Mesoscutum
coarsely tessellate-granulose, punctation sparse on disc (i=1–2.5d), denser laterad of parapsidal line and on anterolateral portion (i=1–1.5d). Mesoscutellum tessellate, submedial punctation sparse (i=1–4d). Axilla punctate. Metanotum imbricate.
Preëpisternum rugulose-imbricate. Hypoepimeral area tessellate-imbricate. Mesepisternum rugulose-imbricate.
Metepisternum with dorsal half rugoso-carinulate, ventral half imbricate. Metapostnotum weakly rugoso-carinulate, posterior
margin imbricate. Propodeum with dorsolateral slope imbricate, lateral surface tessellate-imbricate, posterior surface tessellate. Metasomal terga weakly coriarious, punctation moderately dense basally (i=1–1.5d), apical impressed
areas obscurely, sparsely punctate.
Structure. Head elongate (length/width ratio = 1.09–1.13). Eyes convergent below (UOD/LOD ratio = 1.38–1.43).
Clypeus ½ below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets close (IAD/OAD < 0.5). Frontal line carinate, ending 3OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3–
4 branches. Metapostnotum truncate (MMR ratio = 1.25–1.38), posterior margin rounded onto posterior surface. Propodeum
with oblique carina very fine or absent, lateral carina fine, reaching less than halfway to dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 3.75–4.11 mm;
head length 1.20–1.22 mm; head width 1.08–1.13 mm; forewing length 2.72–2.84 mm.
Colouration. Legs brown, except tarsi brownish yellow.
Pubescence. Face below eye emargination with tomentum obscuring paraocular area, partially obscuring clypeus
and supraclypeal area. Metasomal terga without tomentum. S4–S5 with lateral patches of medially directed hairs (1–1.5
Surface sculpture.. Metasomal terga punctation moderately dense (i=1–1.5d), apical impressed areas impunctate.
Structure. Head very elongate (length/width ratio = 1.09–1.11). Eyes strongly convergent below (UOD/LOD ratio =
1.58–1.61). Clypeus 1/2 below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets distant
(IAD/OAD = 1.0). Frontal line carinate, ending 2.5OD below median ocellus. Pedicel subequal to F1. F2 length 1.4–
1.5X F1. F2–F10 moderately elongate (length/width ratio = 1.33–1.50). Metapostnotum normal (MMR ratio = 1.22–
1.42), posterior margin weakly angled onto posterior surface.
Terminalia. S7 with median lobe acuminate (Fig. 83). S8 with apicomedial margin weakly convex (Fig. 83). Genital
capsule as in Fig. 83. Gonobase with ventral arms narrowly separated. Volsella roughly ovoid. Gonostylus elongate, dorsal
setae elongate. Retrorse lobe elongate, attenuated apically.
Range. Florida, north to Maryland, Delaware, west to Kansas, Texas (Fig. 84). USA: DE, FL, GA, IL, KS, KY, MD,
MO, MS, NC, SC, TN, TX, VA.
Additional specimens examined. USA: DELAWARE: 2♀♀ Fenwick I., N38.6813 W075.0726, 26.viii.2006 (S.W.
Droege); [PCYU]; FLORIDA: 1♂ Mount Pleasant, 1.v.1952 (G.S. Walley); [CNC]; 1♀ (Halictus longiceps paratype)
Inverness (C. Robertson); [INHS]; GEORGIA: 1♂ Ware Co., Deenwood, N31.1319 W082.2307, 42 m, 16–18.vii.1916; [AMNH]; KANSAS: 1♀ Douglas Co., N39°2.68′ W095°12.24′, 26.viii.2004 (J. Hopwood); [PCYU]; KENTUCKY: 1♀
Wayne Co., N36.924 W084.8715, 23–24.vii.2007 (S.W. Droege); [PCYU]; MARYLAND: 1♀ Montgomery Co., Cabin
John, N38.58310 W077.09290,52 m, 27.v.1915 (J.C. Crawford); [AMNH]; 1♀ Caroline Co., N39.1098 W075.7724,
7.iv.2005 (S.W. Droege); [PCYU]; MISSISSIPPI: 3♀♀ Jackson Co., N30.5297 W088.6942, 4–5.vi.2005 (S.W. Droege);
[PCYU]; MISSOURI: 1♀ Newton Co., Diamond Grove Prairie, 20.vi.2005 (Arduser); [PCYU]; NORTH CAROLINA:
4♀♀ Swain Co., Andrews Bald Mountain, N35.54166 W083.49333°, 1801 m, 25.vii.1923 (J.C. Crawford); 1♀ Wake
Co., Raleigh, N35.77194 W078.63889, 14.vi.1924 (T.B. Mitchell); [AMNH]; 3♀♀1♂ Hoke Co., Fort Bragg Mil. Res.,
10–13.vi.1998 (B.N. Danforth); [CUIC]; 1♀ E of Charlotte, N35.24474 W080.53715, 10.viii.2006 (C. Sheffield);
[PCYU]; 7♂♂ Horse Cove Bog, nr. Highlands, 2900 ft., 18.vii.1957 (J.G. Chillcott); [CNC]; SOUTH CAROLINA: 6♀♀
Dillon Co., Dillon, N34.41655 W079.37116, 34 m, 25.iv.1923; [AMNH]; 2♀♀ Chesterfield Co., N34.55 W080.26, 2007
(L. Housh); [PCYU]; TEXAS: 2♀♀ Denton Co., N33.2043 N097.0816, 27.iv.2002 (H.W. Ikerd); [PCYU]; VIRGINIA:
1♂ Fluvanna Co., N37.7529 W078.1625, 2.x.2004 (S.W. Droege); [PCYU].
Floral Records. ALISMATACEAE: Aisma plantago-aquatica; APIACEAE: Daucus carota, Eryngium, Zizia
aurea; AQUIFOLIACEAE: Ilex; ASCLEPIADACEAE: Asclepias; ASTERACEAE: Coreopsis palmata, C. tripteris,
Erigeron annuus, Haplopappus, Helenium, Krigia biflora, Leucanthemum vulgare, Liatris gracilis, Mikania scandens,
Pityopsis graminifolia tracyi, Rudbeckia hirta, R. subtomentosa, Senecio, Solidago canadensis, Solidago sempervirens
mexicana, Symphyotrichum novae-angliae, S. pilosum; BRASSICACEAE: Capsella bursa-pastoris, Lepidium virginicum,
Warea carteri; CACTACEAE: Opuntia austrina; CAPRIFOLIACEAE: Symphoricarpos orbiculatus; ERICACEAE:
Rhododendron maximum; EUPHORBIACEAE: Croton cascarilla; FABACEAE: Amorpha fruticosa, Dalea,
Galactia pinetorum, Medicago; LAMIACEAE; Piloblephis rigida, Pycnanthemum; ONAGRACEAE: Oenothera;
PLANTAGINACEAE: Plantago; POLEMONIACEAE: Polemonium reptans; RANUNCULACEAE: Ranunculus;
RHAMNACEAE: Ceanothus; ROSACEAE: Fragaria, Malus, Rubus, Spiraea; RUBIACEAE: Houstonia purpurea;
SALICACEAE: Salix; UNCERTAIN: “Gerardia”.
DNA Barcode. Available. Multiple sequences.
The name L. coreopsis is used in a more restricted sense than by some earlier authors due to the resurrection of a previously
synonymous name (see L. longifrons below).