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Lasioglossum pictum (Crawford, 1902)
Halictus pictus Crawford, 1902; Halictus graenicheri Ellis, 1914; Dialictus muskegonensis Mitchell, 1960; Dialictus pictus (Crawford, 1902); Chloralictus graenicheri (Ellis, 1914)

Life   Insecta   Hymenoptera   Apoidea   Halictidae   Lasioglossum
Subgenus: Dialictus

Lasioglossum pictum, -unknown, -back 2012-07-19-17.25.44
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Lasioglossum pictum, -unknown, -back 2012-07-19-17.25.44

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    Identification Tips:

    In the western part of L. pictum's range in the western prairies it can be confused with darker L. hudsoniellums here is how to tell the females apart.

    L. pictum - Head, gena, underside adjacent to the hypostomal cavity, long striations roughly paralleling the hypostomal cavity occupy the whole area with perhaps a small region near the mandibles left smooth and shiny - Abdomen, T1, pitting SPARSE, much greater than 1 pit diameter apart and disappearing before reaching the rim - Abdomen, T1, Hair fan complete - Head, clypeus, rim always dark with no light areas - Head, paraocular region, hair always sparse and surface visible

    L. hudsoniellum - Head, gena, underside adjacent to the hypostomal cavity, with NO striations the area completely smooth and shiny - Abdomen, T1, pitting DENSE, approximately 1 pit diameter apart and maintaining that density to within a few pit diameters of the rim - Abdomen, T1, Hair fan with a small opening at the top - Head, clypeus, rim USUALLY but not always with a lighter area varying from bright orange to almost completely dark - Head, paraocular region, hair USUALLY bright white and dense enough to obscure some of the surface, this character often absent in poorly prepared specimens and older individuals

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Lasioglossum pictum, unknown, face 2012-07-19-17
© Copyright source/photographer · 9
Lasioglossum pictum, unknown, face 2012-07-19-17
Lasioglossum pictum, unknown, face
© Copyright source/photographer · 9
Lasioglossum pictum, unknown, face

Lasioglossum pictum, f, back, Pennington Co., SD
© Copyright source/photographer · 7
Lasioglossum pictum, f, back, Pennington Co., SD
Lasioglossum pictum, f, face, Pennington Co., SD
© Copyright source/photographer · 7
Lasioglossum pictum, f, face, Pennington Co., SD

Lasioglossum pictum, f, right, Pennington Co., SD
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Lasioglossum pictum, f, right, Pennington Co., SD
Lasioglossum pictum FEM CFP comp
© Copyright Laurence Packer 2014 · 7
Lasioglossum pictum FEM CFP comp

Lasioglossum pictum MALE mm .x ZS PMax
© Copyright Laurence Packer 2014 · 7
Lasioglossum pictum MALE mm .x ZS PMax
Lasioglossum pictum, Barcode of Life Data Systems
Barcode of Life Data Systems · 1
Lasioglossum pictum, Barcode of Life Data Systems
Overview

Identification SummaryModerately sized; mesepisternum punctate; metasoma orange-yellow.


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 5 mm.; head and thorax greenish, abdomen bright ferruginous; pubescence short and thin, entirely pale, quite dense on apical half of abdomen; head very slightly broader than long; clypeus convex, somewhat protuberant, projecting about one- half below suborbital line, entirely dark; eyes convergent below; lateral ocelli much nearer eyes than to each other; mandibles ferruginous except at base; cheeks subequal to eyes in width; face below ocelli rather dull, punctures close, deep and distinct, but rather fine, becoming minute on the more shining vertex, cheeks shining above, becoming very finely striate below, hypostomal carinae parallel; lower half of face somewhat more shining, punctures more distinctly separated and somewhat more coarse, supraclypeal area rather dull, with rather widely separated, shallow punctures, those on clypeus rather close and deep above, becoming coarser and more sparse toward apical margin; scutum and scutellum somewhat shining, punctures rather fine (about as in ceanothi, fig. 99), quite close on scutum medially and posteriorly, not so close on each side, but closer between notaulices and tegulae; pleura somewhat shining, with close and rather obscure punctures above, these becoming obscured below; dorsal area of propodeum coarsely striate laterally, median portion with short and fine basal striae, becoming smooth and rounded on apical margin, lateral faces subrugose; wings whitish, veins and stigma pale testaceous; tegulae testaceous; femora dark in general, tips somewhat yellowish, tibiae and tarsi more ferruginous, becoming yellow apically; abdominal terga shining, very minutely but rather closely punctate, apical margins very broadly impressed, this area yellow, discs more ferruginous, terga 3-5 largely obscured with yellowish-tomentum.

DISTRIBUTION�Nebraska, Minnesota, Wisconsin, Michigan and Illinois; April to September. The author is indebted to Warren T. Atyeo for sending a co-type of pictus.



Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 249-253


Halictus pictus Crawford, 1902: 236. ♀. Syntypes. 2♀ USA, Nebraska, Crawford, Sioux Co., 29.vii.1901 on Mentzelia, (M.A. Carriker); [UNSM]. Examined. Halictus graenicheri Ellis, 1914b: 221. ♀. Holotype. 1♀ USA, Wisconsin, Genoa, Vernon Co., Wisconsin, 13�19.vii.1911; [NMNH: 27761]. Examined. Dialictus muskegonensis Mitchell, 1960: 439. ♂. Holotype. ♂ USA, Michigan, Muskegon Co., 2.viii.1944, (R.R. Dreisbach); [NCSU]. Examined.


Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) graenicheri, p. 1113, L. (C.) pictum, p. 1116 (catalogue); Krombein, 1958: Lasioglossum (Chloralictus) graenicheri, p. 230, (catalogue); Mitchell, 1960: Dialictus pictus ♀, p. 412 (redescription, synonymy); Mitchell, 1962: Dialictus pictus, p. 547 (synonymy); Krombein, 1967: Lasioglossum (Dialictus) pictum, p. 465 (catalogue); Hurd, 1979: Dialictus pictus, p. 1970 (catalogue); Moure & Hurd, 1987: Dialictus pictus, p. 122 (catalogue).


Diagnosis. Females of L. pictum can be recognised by the orange-yellow metasoma, blackish brown apical half of the clypeus, moderately sparse tomentum on the lower paraocular area, reticulate-punctate mesepisternum, primarily brown legs, and obscure punctures on the apical impressed areas of the metasomal terga. They are most similar to L. hudsoniellum which have the apical half of the clypeus brownish red, dense tomentum on the lower paraocular area and deep punctures on the apical impressed punctures on the mesepisternum. Females of both L. (E.) testaceum and L. vierecki have brownish yellow metasoma but differ as follows. Female L. testaceum have strong propodeal carinae and rugulose mesepisternum. Female L. vierecki have the mesoscutum obscured by dense yellowish tomentum and extensively brownish yellow legs.


Males of L. pictum can be recognised by the moderately elongate head (length/width ratio = 0.98�1.02), lower face with moderately dense tomentum, short flagellomeres with the ventral surface orange-yellow; moderately sparse mesoscutal punctation (i=1�2d), fine parapsidal lines, distinct mesepisternal punctures, metasomal reddish brown with apical margins orange-yellow. They are most similar to L. foveolatum which has a very deep and wide parapsidal lines and brown metasomal terga.


Redescription. FEMALE. Length 4.76�5.49 mm; head length 1.32�1.51 mm; head width 1.44�1.54 mm; forewing length 3.66�4.02 mm.


Colouration. Head and mesosoma pale green to bluish green. Labrum reddish brown to yellow. Mandibles brown to yellow. Clypeus with apical half blackish brown and basal half, and supraclypeal area bronze. Antenna dark brown, flagellum with ventral surface orange-brownish yellow. Tegula pale brownish yellow. Wing membrane subhyaline, venation and pterostigma pale amber. Legs brown, tibial bases and sometimes apices, meso- and metabasitarsus, and medio- and distitarsi red to brownish yellow, basitarsus suffused with brown. Propodeum with dorsal surface blue. Metasoma terga pale orange-yellow; terga and sterna with apical margins translucent yellow.


Pubescence. Dull white. Moderately dense. Head and mesosoma with moderately dense woolly hairs (1� 1.5 OD), longest on genal beard, metanotum and mesopleuron (2�2.5 OD). Lower paraocular area and gena with subappressed tomentum, not obscuring surface. Metepisternum obscured by tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2�2.5 OD). Metasomal terga with moderately dense, fine setae. T1 acarinarial fan complete (obscure on pale background). T2 basolateral and T3�T5 with moderately dense tomentum largely obscuring surface. T2 apicolateral and T3�T4 apical margins with weak fringes.


Surface sculpture. Face imbricate, punctation moderately strong. Clypeus with apical half polished, punctation moderately sparse (i=1�2.5d). Supraclypeal area with punctation moderately sparse (i=1�2.5d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1�1.5d). Upper paraocular area, frons and ocellocular area punctate-reticulate. Gena and postgena lineolate. Mesoscutum weakly imbricate, polished submedially, punctation dense between parapsidal lines (i≤d), contiguous laterad of parapsidal lines and punctate-reticulate on anterolateral portions. Mesoscutellum polished, submedial punctation sparse (i=1�3d). Axilla punctate. Metanotum imbricate. Pre�pisternum rugulose. Hypoepimeral area imbricate-punctate. Mesepisternum rugulose-punctate (i≤d), more polished below. Metepisternum with dorsal half rugoso-striate, ventral half imbricate. Metapostnotum with complete, rugoso-striate, posterior margin rounded and raised. Propodeum with dorsolateral slope and lateral surface weakly rugulose, posterior surface imbricate. Metasomal terga polished except apical impressed areas weakly coriarious, punctation fine throughout, close on basal halves (i=1�2d), more widely spaced on marginal zone (i=1�3d).


Structure. Head wide (length/width ratio = 0.92�0.98). Eyes convergent below (UOD/LOD ratio = 1.19� 1.24). Clypeus 1/2 below suborbital tangent, apicolateral margins strongly convergent. Antennal sockets close (IAD/OAD < 0.5). Frontal line carinate, ending 2 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3�4 teeth. Metapostnotum truncate (MMR ratio = 1.30�1.45), posterior margin weakly angled onto posterior surface. Propodeum with oblique carina obscure, lateral carina weak, not reaching dorsal margin.


MALE. Similar to female except for the usual secondary sexual characters and as follows. Length.5.37� 5.55mm; head length 1.30�1.39 mm; head width 1.32�1.42 mm; forewing length 3.54�3.72 mm.


Colouration. Labrum and mandible pale yellow. Legs brown, Pro- and mesotibia, and metatibial base and apex, and tarsi brownish yellow; pro- and mesotibia dorsal surface brown. Metasoma reddish brown, darker posteriorly; terga apical margins orange to brownish yellow; S1�S4 orange.


Pubescence. Face below eye emargination with subappressed tomentum obscuring paraocular area and partially obscuring clypeus and supraclypeal area. Metasomal terga without appressed tomentum. S2�S3 apical portions with erect, plumose hairs (1�1.5 OD). S4�S5 disc with erect, plumose hairs (1�1.5 OD).


Surface sculpture. Surface more polished. Mesoscutum polished, punctation moderately sparse between parapsidal lines (i=1�2d), closer laterad of parapsidal lines (i≤d), contiguous on anterolateral portions. Mesepisternum closely punctate (i≤d). Metapostnotum striate. Propodeum with dorsolateral slope and lateral and posterior surfaces rugulose. Metasomal terga with punctation deep and distinct across disc (i=1�1.5d), marginal zones with a few punctures basomedially.


Structure. Head moderately elongate (length/width ratio = 0.98�1.02). Eyes strongly convergent below (UOD/LOD ratio = 1.42�1.43). Clypeus with apicolateral margins subparallel. Antennal sockets distant (IAD/ OAD < 1.0). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than F1. F2 length 1.6� 1.8X F1. F2�F10 moderately short (length/width ratio = 1.25�1.45). Metapostnotum moderately elongate (MMR ratio = 1.20�1.33), posterior margin weakly angled onto posterior surface.


Terminalia. S7 with median lobe columnar, apex rounded (Fig. 179F). S8 with apicomedial margin strongly convex (Fig.179F). Genitalia as in Fig. 179D�E. Gonobase with ventral arms narrowly separated. Gonostylus small. Retrorse lobe wide and short, rounded apically.


Range. Ontario west to Alberta and Nebraska (Fig. 177).


Additional material examined. CANADA: ALBERTA: 1♂ CFB Suffield, Amiens, N50�37.678� W110�18.371�, 16.viii. MANITOBA: 1♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank, N49�41�28�� W099�34�29��, 15.vi.2005 (A.M. Patenaude); 1♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank, N49�41�28�� W099�34�29��, 20.vi.2005 (A.M. Patenaude); 1♀ YellowQuill Mxd. Grass Prairie Preserve, near Treesbank, N49�41�28�� W099�34�29��, 16.viii.2005 (A.M. Patenaude); ONTARIO: 1♀ Leamington, 6.vi.1961 (G. Knerer); 7♀♀ Long Point, 20�23.vi.1996 (P.J. Carson); 1♂ Rondeau Pk., 19.ix.1961 (G. Knerer); [PCYU]; SAKATCHEWAN: 1♂ Sask. Landing, 23.vii.1956 (O. Peck); [CNC]; USA: INDIANA: 1♀ Newton Co., Conrad, 30.vii.2003 (R.P Jean); [PCYU]; MICHIGAN: 1♀ Cass Co., Cassapolis, 20.vii.2009 (Tuell et al.); [ARC]; MINNESOTA: 1♀ Clay Co., 4 mi E, 1 mi S Glyndon, 24.v.2005 (R.L. Andres); 1♀ Clay Co., 4 mi E, 1 mi S Glyndon, 10.vi.2005 (R.L. Andres); 4♀♀ Sher Co., Zimmerman, Sherburne NWR, 10.vii.2001 (S. Droege); [PCYU]; NEBRASKA: 1♀ paratype West Pt., 10.vi.1901 (J.C. Crawford); [NMNH].


Floral records. ASTERACEAE: Erigeron philadelphicus, Solidago, BRASSICACEAE: Lepidium, FABACEAE: Melilotus, HYDROPHYLLACEAE: Phacelia congesta, LAMIACEAE: �Salviastrum texanum,� LOASACEAE: Mentzelia, ROSACEAE: Rosa, SALICACEAE: Salix.


Biology. Knerer & Atwood, 1962: (nest site, geography, floral records).


Comments. Relatively common. DNA barcodes of L. pictum cannot be clearly differentiated from those of L. foveolatum. These species do not seem similar morphologically.

Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.

Lasioglossum (Dialictus) pictum (Crawford)

Halictus pictus Crawford, 1902a: 236. ♀.

Syntypes. 2♀ USA, Nebraska, Crawford, Sioux Co., 29.vii.1901 on Mentzelia, (M.A. Carriker); [UNSM]. Examined.

Halictus graenicheri Ellis, 1914b: 221. ♀.

Holotype. 1♀ USA, Wisconsin, Genoa, Vernon Co., Wisconsin, 13�19.vii.1911 [NMNH: 27761]. Examined.

Dialictus muskegonensis Mitchell, 1960: 439. ♂.

Holotype. ♂ USA, Michigan, Muskegon Co., 2.viii.1944, (R.R. Dreisbach); [NCSU]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) graenicheri, p. 1113, L. (C.) pictum, p. 1116 (catalogue); Krombein, 1958: Lasioglossum (Chloralictus) graenicheri, p. 230, (catalogue); Mitchell, 1960: Dialictus pictus ♀, p. 412 (redescription, synonymy); Mitchell, 1962: Dialictus pictus, p. 547 (synonymy); Krombein, 1967: Lasioglossum (Dialictus) pictum, p. 465 (catalogue); Hurd, 1979: Dialictus pictus, p. 1970 (catalogue); Moure & Hurd, 1987: Dialictus pictus, p. 122 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) pictum ♀♂, p. 249 (redescription, key).

Diagnosis. Female L. pictum can be recognised by the following diagnostic combination clypeus black-brown distally; postgena polished; lower paraocular area with moderately sparse tomentum; mesoscutum not obscured by tomentum; mesepisternum reticulate-punctate; legs mostly brown; and metasoma orange-yellow metasoma, apical impressed areas obscurely punctate. They are most similar to L. arantium, which has a reddish orange metasoma and a completely lineolate postgena.

Male L. pictum can be recognised by head moderately elongate (length/width ratio = 0.98�1.02); face with moderately dense tomentum; flagellomeres short, orange-yellow ventrally; mesoscutal punctures moderately sparse (i=1�2d); parapsidal line narrow; mesepisternum distinctly punctate; and metasomal terga reddish brown, apical margins orangeyellow. They are similar to L. foveolatum, which has a very deep and wide parapsidal lines (Fig. 15B) and brown metasomal terga.

Range. Ontario west to Alberta and Nebraska. USA: IN, MI, MN, NE, WI. CANADA: AB, MB, ON, SK.

DNA Barcode. Available. Multiple sequences.

Comments. Uncommon east of the Mississippi.


Identification
Extracted from: Gardner, J. and J. Gibbs. 2020. The ‘red-tailed’ Lasioglossum (Dialictus) (Hymenoptera: Halictidae) of the western Nearctic. European Journal of Taxonomy 725: 1–242

Diagnosis

Females of Lasioglossum pictum can be recognized by the face short (length/width ratio ~0.82), supraclypeal area dull, frons and mesepisternum with crowded punctures, scutum with dense but distinctly separated punctures (i ≤ 1 pd), postgena lineate, clypeus apical margin reddish brown to black, and T2–4 with dark spiracular spots. They are most similar to L. arenisaltans sp. nov. Females of L. arenisaltans sp. nov. have the face slightly longer (length/width ratio ~0.85), scutum very densely punctate (i < 1 pd), and clypeus apical margin sometimes orange.

Males of L. pictum can be recognized by the face short (length/width ratio ~0.83), propodeum dorsolateral slope rugose, postgena lineate, face covered in relatively sparse tomentum not hiding the surface underneath, mesepisternum densely punctate (i ≤ 1 pd), S3–5 with uniform short hair (0.75– 1.25 OD), and legs and metasoma mostly dark reddish brown to black, becoming red to orange on the extremities. They are most similar to L. arenisaltans sp. nov. and L. zephyrus. Males of L. arenisaltans sp. nov. have a longer face (length/width ratio ~0.89) and legs and metasoma often entirely orange. Males of L. zephyrus have the mesosoma more finely and sparsely punctate (i=1–3 pd) and S3–5 with shorter, densely plumose hair concentrated laterally (Fig. 116A).

Description

See Gibbs (2010) for a complete redescription and figures.

Range

Ontario west to Alberta and south to northern Arizona (Fig. 74).

Floral records

ASTERACEAE Giseke: Coreopsis: C. palmata Nutt.• Erigeron: E. philadelphicus L.(G10)• Helianthus: H. petiolaris Nutt. • Solidago • BORAGINACEAE Juss. Phacelia Juss. P. congesta Hook. (G10) • BRASSICACEAE Burnett: Lepidium L. (G10) • CAPRIFOLIACEAE Juss. Symphoricarpos Duhamel • COMMELINACEAE Mirb. Tradescantia L. T. occidentalis (Britton) Smyth • FABACEAE Juss. Amorpha: A. canescens Pursh • Dalea: D. villosa (Nutt.) Spreng.• Melilotus: M. officinalis (L.) Pall. M. o. subsp. alba (Medik.) H. Ohashi & Tateishi • LAMIACEAE Martinov: Salvia L. S. texana (Scheele) Torr. (G10) • LOASACEAE Juss. Mentzelia L. • ONAGRACEAE Juss. Oenothera L. O. clelandii W. Dietr., P.H. Raven & W.L. Wagner • PLANTAGINACEAE Juss. Penstemon Schmidel: P. gracilis Nutt. • ROSACEAE Juss. Prunus L. P. virginiana L. • Rosa L. • SALICACEAE Mirb. Salix L. (G10) • VERBENACEAE J. St.-Hil. Verbena L. V. stricta Vent.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Apocynaceae  Asclepias syriaca @ AMNH_BEE (6)
Asteraceae  Helianthus @ AMNH_BEE (5)
Fabaceae  Amorpha canescens @ AMNH_BEE (1)
Scrophulariaceae  Penstemon angustifolius @ BBSL (1)

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