Identification Summary: Moderate sized; very similar to L. disabanci (which occurs to the north and in the mountains); pits very clearly visible on mirror smooth surface of mesepisturnum; fan complete on T1 and very full; thorax green gold; abdomen very dark with clear, discrete, sharp white triangular patches of short appressed hairs on the far sides of T2-3.
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 5.5 mm.; head and thorax metallic green, abdominal terga metallic greenish basally, becoming more or less bluish across center of discs and to some degree reddened or testaceous apically; pubescence short, thin, entirely yellowish-white; head slightly broader than long; clypeus convex, projecting somewhat more than one-half below suborbital line; supraclypeal area somewhat broader than long and considerably shorter than clypeus; eyes convergent below; lateral ocelli somewhat nearer eyes than to each other; cheeks subequal to eyes in width; face below ocelli somewhat shining between deep, distinct, coarse and rather close punctures, these becoming more distinctly separated and finer on vertex; cheeks above somewhat shining, obscurely punctate, becoming somewhat striate posteriorly but smooth and shining below; hypostomal carinae parallel, apical angle very narrowly rounded; lower half of face somewhat shining, punctures deep, distinct and somewhat separated but not sparse, those on supraclypeal area sparse medially, becoming rather close laterally, those on clypeus deep and distinct, rather close and fine along upper margin, becoming considerably more sparse and slightly more coarse apically, the apical third darkened; scutum and scutellum somewhat shining, punctures deep and distinct, rather widely separated medially but becoming almost crowded laterally (much as in nymphaearum, fig. 99); pleura shining, punctures deep, distinct and irregularly scattered, becoming obscure and minute below posteriorly; dorsal area of propodeum with a single, median, distinct striae, narrowly rugoso-striate on each side of this, lateral portions coarsely, distinctly and completely striate, lateral faces smooth, somewhat shining; wings subhyaline, veins and stigma yellowish-testaceous; tegulae brownish-testaceous; legs piceous basally, becoming somewhat more brownish or testaceous apically; abdominal terga somewhat shining, basal tergum practically impunctate, terga 2 and 3 with some exceedingly minute and rather close punctures barely in evidence across base, but otherwise largely impunctate, broadly impressed apically and becoming gradually yellowish-hyaline to apical margin; terga 3 and 4 sparsely covered with appressed tomentum which does not obscure the surface.
DISTRIBUTION—Quebec, the New England states and Ohio, south to Georgia; April to September.
FLOWER RECORDS—Aruncus, Chrysanthemum, Houstonia, Malus, Rubus, Rudbeckia, and Viburnum.
Both sexes of this species were included in the original description, but the male has not been seen by this writer. The description is too brief to make recognition possible, and the correctness of its association with this female is open to question.
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 89-92
Halictus cattellae Ellis, 1913: 209. ♀ ♂.
Holotype. ♀ USA, New York, Garrison, [UCMC]. Examined.
Dialictus alternatus Mitchell, 1960: 433. ♂. [new synonymy]
Holotype. ♂ USA, Massachusetts, Forest Hills, 29–30.Aug.1922 (W.M. Wheeler); [MCZ: 30469]. Examined.
Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) cattellae, p. 1112 (catalogue); Mitchell, 1960: Dialictus
cattellae ♀, p. 386 (redescription); Krombein, 1967: Lasioglossum (Dialictus) alternatum, p. 462, L. (D.)
cattellae, p. 462 (catalogue); Hurd, 1979: Dialictus alternatus, p. 1964, D. cattellae, p. 1965 (catalogue);
Moure & Hurd, 1987: Dialictus alternatus, p. 89, D. cattellae, p. 94 (catalogue).
Diagnosis. Females of L. cattellae are recognisable by the diagnostic combination of a polished golden
green colour on the head, mesosoma and vaguely on the metasoma, strong mesoscutal punctures which are
dense adjacent to the parapsidal lines, yellowish woolly hairs on the mesoscutum, strong and sparse mesepisternal
punctures (i=1–2d), complete but small T1 acarinarial fan, sparse punctures on the basal portions of the
metasomal terga and nearly impunctate apical halves of the metasomal terga (Fig. 85E). They are most similar
to L. tenax which are bluish green with less strong mesoscutal punctures and dull white woolly hairs on the
mesoscutum. Female L. obscurum are also similar but have sparse punctures on the lateral mesoscutal surface.
Males of L. cattellae are similar to the females but have moderately dense punctures reaching the premarginal
line, only the apical impressed area impunctate. They are most similar to L. tenax which have relatively
sparse punctures on the basal halves of the metasomal terga that clearly do not reach the premarginal line.
Redescription. FEMALE. Length 4.82–5.86 mm; head length 1.37–1.49 mm; head width 1.37–1.51 mm;
forewing length 3.97–4.15 mm.
Colouration. Head and mesosoma green to golden green. Clypeus with apical half blackish brown, basal
half, and supraclypeal area brassy. Lower paraocular area with blue reflections. Antenna dark brown, flagellum
with ventral surface reddish brown. Tegula reddish brown to amber. Wing membrane subhyaline, venation
and pterostigma amber. Legs brown, tibial bases reddish brown to orange, medio- and distitarsi brownish
yellow. Metasoma brown, T1–T3 with vague golden to green reflections, terga and sterna with apical margins
reddish brown to translucent brownish yellow.
Pubescence. Dull white to yellowish. Sparse. Head and mesosoma with moderately dense woolly hairs
(1–2 OD), longest on genal beard, metanotum and mesopleuron (2–2.5 OD), distinctly yellowish on mesoscutum.
Paraocular area without tomentum. Gena with sparse tomentum. Propodeum with moderately dense plumose
hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with sparse, fine setae. T1
acarinarial fan complete, not reaching dorsal margin of declivitous surface. T2–T3 basolateral areas with few
appressed hairs. T4 with sparsely scattered appressed hairs on disc. T3–T4 without apical hair bands.
Surface sculpture. Face polished, faintly imbricate, punctation moderately strong. Clypeal punctation
sparse (i=1–3d). Supraclypeal area with punctation moderately sparse (i=1–2.5d). Lower paraocular and
antennocular areas with punctation moderately dense (i=1–1.5d). Upper paraocular area and frons reticulatepunctate.
Ocellocular area sparsely, minutely punctate (i=1–2d). Gena shining, faintly lineolate. Postgena polished.
Mesoscutum polished, punctation moderately strong, medially sparse (i=1–2d), but contiguous adjacent
to parapsidal lines and on anterolateral portions. Mesoscutellum punctation similar to mesoscutum, distinctly
separated on medial line, submedial area polished. Axilla reticulate-punctate. Metanotum imbricate. Preëpisternum
and mesepisternum polished between strong punctures (i=1–2d). Metepisternum with dorsal half
rugoso-striate, ventral half imbricate. Metapostnotum incompletely striate. Propodeum with dorsolateral slope
and lateral surface imbricate, posterior surface tessellate. Metasomal terga polished except T1 declivitous surface
and apical impressed areas weakly coriarious, punctation on basal halves sparse (i=2–4d), apical halves
impunctate (except along premarginal line).
Structure. Head round (length/width ratio = 0.98–1.00). Eyes convergent below (UOD/LOD ratio = 1.15–
1.21). Clypeus ½ below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/
OAD < 0.5). Gena narrower than eye. Inner metatibial spur pectinate with 3 teeth. Metapostnotum moderately
elongate (MMR ratio = 1.18–1.21), posterior margin weakly angled onto posterior surface. Propodeum with
oblique carina weak, lateral carina weak, not reaching dorsal margin.
MALE. Length. 4.33–4.45 mm; head length 1.32–1.38 mm; head width 1.30–1.37 mm; forewing length
Colouration. Head and mesosoma bluish green to pale green. Clypeus with apical half blackish brown,
basal half and supraclypeal area bronze. Antenna dark brown, flagellum with ventral surface brownish yellow.
Tegula dark reddish brown. Wing membrane subhyaline, venation and pterostigma yellowish brown. Legs
brown, tarsi brownish yellow. Metasoma dark brown, terga and sterna with apical margins reddish brown to
translucent brownish yellow.
Pubescence. Dull white. Moderately sparse. Head and mesosoma with moderately dense woolly hairs (1–
1.5 OD), longest on genal beard, metanotum and mesopleuron (1.5–2.5 OD). Face below eye emargination with sparse tomentum not obscuring surface. Lower paraocular area with moderately dense tomentum, partially obscuring surface. Gena with sparse tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (1.5–2 OD). Metasomal terga with moderately dense, fine setae. T1 acarinarial fan sparse, complete dorsally. S2–S3 apical halves and S4–S5 lateral portions with moderately sparse plumose hairs.
Surface sculpture. Face weakly imbricate, punctation fine. Clypeus polished, punctation moderately dense
(i=1–2d). Supraclypeal area with punctation moderately dense (i=1–1.5d). Lower paraocular and antennocular
areas with punctation dense (i≤d). Upper paraocular area, frons and ocellocular area punctate-reticulate. Gena
and postgena strongly lineolate. Mesoscutum weakly imbricate, punctation moderately strong, deep, sparse
between parapsidal lines (i=1–2.5d), dense laterad of parapsidal line (i≤d), contiguous on anterolateral portion.
Mesoscutellum similar to mesoscutum, submedial punctation sparse (i=1–3d). Axilla minutely punctate.
Metanotum rugulose. Preëpisternum rugose. Hypoepimeral area reticulate. Mesepisternum polished, strongly
punctate (i=1–1.5d). Metepisternum with dorsal two-thirds rugoso-striate, ventral third imbricate. Metapostnotum
completely rugoso-striate. Propodeum with dorsolateral slope and posterior surface rugose, lateral surface
rugulose. Metasomal terga weakly coriarious, punctation uniformly dense (i=1–1.5d), except apical
impressed areas impunctate.
Structure. Head round (length/width ratio = 1.01). Eyes strongly convergent below (UOD /LOD ratio =
1.52). Clypeus 2/3 below suborbital line, anterolateral margins weakly convergent. Antennal sockets distant
(IAD/OAD > 1.3). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than F1. F2
length 1.7–1.8X F1. F2–F10 moderately elongate (length/width ratio = 1.64–1.73). Gena narrower than eye.
Metapostnotum truncate (MMR ratio = 1.14–1.20), posterior margin sharply angled onto posterior surface.
Propodeum with oblique carina strong, obscure among sculpture, lateral carina moderately strong, reaching 2/
3 of the distance to dorsal margin.
Terminalia. S7 with median lobe clavate, sides subparallel, apex rounded (Fig. 86G). S8 with apicomedial
margin weakly convex (Fig. 86G). Genitalia as in Fig. 86E–F. Gonobase with ventral arms narrowly separated.
Gonostylus small, setae elongate. Retrorse lobes elongate and narrow, attenuated apically.
Range. Michigan, Massachusetts south to Georgia, west to Kansas, possibly Ontario and Quebec
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) cattellae (Ellis)
Halictus cattellae Ellis, 1913: 209. ♀ ♂.
Holotype. ♀ USA, New York, Garrison, [UCMC]. Examined.
Dialictus alternatus Mitchell, 1960: 433. ♂.
Holotype. ♂ USA, Massachusetts, Forest Hills, 29–30.viii.1922 (W.M. Wheeler); [MCZ: 30469]. Examined.
Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) cattellae, p. 1112 (catalogue); Mitchell, 1960: Dialictus cattellae
♀, p. 386 (redescription, key); Krombein, 1967: Lasioglossum (Dialictus) alternatum, p. 462, L. (D.) cattellae, p. 462
(catalogue); Hurd, 1979: Dialictus alternatus, p. 1964, D. cattellae, p. 1965 (catalogue); Moure & Hurd, 1987: Dialictus
alternatus, p. 89, D. cattellae, p. 94 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) cattellae ♀♂, p. 89 (redescription,
Diagnosis. Female L. cattellae can be recognised by the following diagnostic combination: head and mesosoma
golden green; metasoma vaguely metallic; mesoscutum with yellowish woolly hairs, punctures moderately coarse, sparse
medially (i=1–2d); mesepisternal punctures distinct and well spaced (i=1–2d); T1 acarinarial fan without dorsal opening;
metasomal terga with sparse punctures basally and nearly impunctate apically, except along premarginal line. They are
most similar to L. tenax, which is bluish green with finer mesoscutal punctures and dull white woolly hairs on the
Male L. cattellae can be recognised by the following diagnostic combination: mesepisternal punctures deep and distinct,
and metasomal terga with punctures dense across disc except apical impressed areas impunctate. They are most
similar to L. perpunctatum, and L. tenax. Male L. perpunctatum have apical impressed areas of metasomal terga punctate.
Male L. tenax have sparse punctures anterior to premarginal line and are usually impunctate on the mesepisternum.
Range. Massachusetts, Michigan south to Georgia, west to Kansas, possibly Ontario and Quebec. USA: GA, IL, IN,
KS, MA, MD, MI, MO, NC, NY, OH, TN, WV.
DNA Barcode. Available. Multiple sequences. DNA barcodes do not clearly differentiate L. cattellae and L. tenax.