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Identification Summary: Appears to be the same at this point as a small cheeked L. apocyni. The lumping or separation of these two is still being worked out.
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 dark olive green, abdomen ferruginous; pubescence short, thin, entirely pale, somewhat more dense toward apex of abdomen; length and breadth of head subequal; clypeus rather broad, somewhat convex, projecting but very slightly below suborbital line; eyes only slightly convergent below; lateral ocelli very slightly nearer eyes than each other; cheeks broader than eyes; face below ocelli dull, punctures very fine and close, but deep and distinct, becoming very obscure on the more shining vertex and upper portions of cheeks, the latter becoming very finely striate and more shining beneath; hypostomal carinae parallel; lower half of face somewhat more shining, punctures rather obscure, more widely separated but not sparse, supraclypeal area somewhat shining, punctures somewhat distinct, rather sparse, those on upper margin of clypeus very fine and well separated, becoming deeper and more distinct, coarse and sparse toward apical margin; scutum and scutellum rather dull, punctures very fine, rather shallow and indistinct, well separated in central portion of discs, becoming somewhat deeper and more distinct and close laterally (much as in heterognat has, fig. 99); pleura rather dull but smooth, without distinct punctures; dorsal area of propodeum rather wide, striae not attaining posterior margin which is rather smooth and rounded, lateral portions shining, very minutely roughened; wings subhyaline, wins and stigma brownish testaceous; tegulae pale ferruginous; legs largely reddish, tibiae more ferruginous, tarsi almost yellowish; abdominal terga smooth and shining, punctures exceedingly minute and obscure, rather sparse on basal tergum, somewhat closer on the following terga, apical margin very slightly impressed, very narrowly hyaline, tergum 4 partially obscured by rather thin pale tomentum.
TYPE S—Holotype: Female, Neel Gap, Ga., Aug. 4, 1945 (P. W. Fattig) [author’s coll.]. Paratypes: GEORGIA: 4 females, topotypical; 2 females, topotypical, June 6, 1956; 1female, Rabun Bald, July 1, 1939 (all Fattig). NORTH CAROLINA: 2 females, Blue Ridge Pkwy, McDowell Co., June 26, 1952 and June 28, 1954; 1 female, Grandfather Mt., June 27, 1952 (on Hydrangea); 1 female, Cumberland Knob Park, June 20, 1950 (all Mitchell) 1 female, Sylva, June 22, 1952 (W. A. Stephen, on Ceanothus); 1 female, Haywood Co., June 17, 1955 (H. V. Weems, Jr., on Aruncus).
Paratypes are in collections of the Florida Plant Board and the author.
Retrieved from: Gibbs, J. 2010. Revision of the metallic species of Lasioglossum (Dialictus)in Canada (Hymenoptera, Halictidae, Halictini). Zootaxa; 2591, 129-132
Dialictus fattigi Mitchell, 1960: 392. ♀.
Holotype. ♀ USA, Georgia, Neel Gap, 4.viii.1945 (P.W. Fattig); [NCSU]. Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) fattigi, p. 463 (catalogue); Hurd, 1979: Dialictus fattigi,
p. 1966 (catalogue); Moure & Hurd, 1987: Dialictus fattigi, p. 100 (catalogue).
Diagnosis. Most similar to L. paradmirandum. See the diagnosis for that species. Also similar to the Eastern
USA species L. apocyni (Mitchell) which is distinguished by its distinctly flattened clypeus, narrow and
elongate mandibles, and gena wider than eye.
Description. FEMALE. Length 4.03–5.55 mm; head length 1.25–1.54 mm; head width 1.27–1.54 mm;
forewing length 3.23–3.90 mm.
Colouration. Head and mesosoma pale golden green, sometimes bluish. Clypeus with apical half blackish
brown, basal half and supraclypeal area sometimes golden. Antenna dark brown, flagellum with ventral surface
dark reddish brown. Tegula pale reddish brown. Wing membrane subhyaline, venation and pterostigma
brownish yellow. Legs brown, medio- and distitarsi reddish brown. Metasoma brown, terga and sterna with
apical margins 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 (2–2.5 OD). Lower paraocular area and gena
with virtually no 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 with wide dorsal opening, equal
to width of lateral hair patches. T2 basolaterally and T3–T5 entirely with sparse tomentum not greatly obscuring
surface. T2 apicolateral and T3–T4 apical margins with weak fringes.
Surface sculpture. Face weakly imbricate, punctation moderately strong. Clypeus polished, punctation
sparse (i=1–3d). Supraclypeal area with punctation sparse (i=1–3d). Lower paraocular and antennocular areas with punctation moderately dense (i=1–1.5d). Upper paraocular area and frons reticulate-punctate. Ocellocular
area minutely punctate (i=1–1.5d). Gena weakly lineolate. Postgena polished, weakly imbricate. Mesoscutum
weakly tessellate-imbricate, punctation fine, moderately sparse between parapsidal lines (i=1–2.5d),
dense laterad of parapsidal line (i≤d), and reticulate on anterolateral portions. Mesoscutellum similar to
mesoscutum, submedial punctation sparse (i=1–4d). Axilla punctate. Metanotum imbricate. Preëpisternum
weakly rugulose. Hypoepimeral area imbricate. Mesepisternum weakly tessellate-imbricate with obscure
shallow punctures (i=1.5–2d). Metepisternum dorsal third rugoso-striate, ventral portion imbricate. Metapostnotum
weakly rugoso-striate, posterior margin imbricate. Propodeum with dorsolateral slope imbricate, lateral
and posterior surfaces tessellate. Metasomal terga coriarious, punctation on basal halves moderately dense
(i=1–1.5d), obscure on apical halves (i=2–2.5d), T1 dorsal portion and T2 apical half virtually impunctate.
Structure. Head round (length/width ratio = 0.98–1.00). Eyes convergent below (UOD/LOD ratio = 1.20–
1.21). Clypeus ½ below suborbital tangent, apicolateral margins strongly convergent. Antennal sockets moderately
close (IAD/OAD < 0.6). Frontal line carinate, ending 2.5 OD below median ocellus. IOD subequal to
OOD. Gena narrower than eye. Inner metatibial spur pectinate with 3 teeth. Metapostnotum moderately elongate
(MMR ratio = 1.33–1.40), posterior margin rounded onto posterior surface. Propodeum with oblique
carina virtually absent, lateral carina weak, reaching halfway to dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length. 5.12
mm; head length. 1.44 mm; head width. 1.34 mm; forewing length. 3.48 mm.
Colouration. Flagellomeres with ventral surface orange-yellow. Tarsi brownish yellow.
Pubescence. Lower paraocular area with moderately dense tomentum obscuring surface. Gena without
evident tomentum. S3–S5 with apical patches of appressed hairs.
Surface sculpture. Clypeal punctation moderately dense (i=1–1.5d). Metanotum rugose. Preëpisternum
and hypoepimeral area rugulose. Metapostnotum with moderately strong rugae nearly reaching posterior margin.
Propodeum with dorsolateral slope rugose, lateral and posterior surfaces ruguloso-imbricate. Metasomal
terga polished, punctation moderately dense (i=1–2d) nearly reaching premarginal line, apical impressed areas
impunctate.
Structure. Head elongate (length/width ratio = 1.07). Eyes strongly convergent below (UOD/LOD ratio =
1.52). Antennal sockets distant (IAD/OAD > 1.2). Frontal line carinate, ending 2 OD below median ocellus.
Pedicel shorter than F1. F2 length 1.9X F1. F2–F10 moderately elongate(length/width ratio = 1.62–1.64).
Propodeum dorsal surface moderately elongate (MMR ratio = 1.30), posterior margin weakly angled onto
posterior surface.
Terminalia. S7 with median columnar, apex rounded (Fig. 110F). S8 with apicomedial margin weakly
convex. Genitalia as in Fig. 110D–E. Gonobase with ventral arms widely separated. Gonostylus small, dorsal
setae elongate. Retrorse lobes narrow, strongly attenuated apically.
Range. Ontario south to Georgia (Fig. 108).
Additional material examined. CANADA: ONTARIO: 10♀♀ Brock University, residences,
31.vii.2003; 18♀♀ Glenridge, escarpment, 25.iv.2003; 3♀♀ Glenridge, escarpment, 28.v.2003; 1♂ Glenridge,
escarpment, 26.ix.2003; 1♀ York University, Keele Campus, CSEB green roof, 20.vi.2005 (E. Willis); 1♀
York University, Keele Campus, Pond Rd. green roof, 17.viii.2006 (E. Willis); 1♀ Toronto, York University,
N43.77175 W079.4965, 3.x.2006 (H. Ngo); [PCYU]; USA: GEORGIA: 1♀ Robin Bald, 9.viii.1957 (W.R.
Richards); [CNC]; NORTH CAROLINA: 1♀ paratype McDowell Co., Parkway, 23.vi.1954 (T.B. Mitchell);
[NMNH].
Floral records. HYDRANGEACEAE: Hydrangea, RHAMNACEAE: Ceanothus, ROSACEAE: Aruncus.
Comments. Uncommon. First description of male.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) fattigi (Mitchell)
Dialictus fattigi Mitchell, 1960: 392. ♀.
Holotype. ♀ USA, Georgia, Neel Gap, 4.viii.1945 (P.W. Fattig); [NCSU]. Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) fattigi, p. 463 (catalogue); Hurd, 1979: Dialictus fattigi, p. 1966
(catalogue); Moure & Hurd, 1987: Dialictus fattigi, p. 100 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) fattigi
♀♂, p. 129 (redescription, key).
Diagnosis. Female L. fattigi can be recognised by the following diagnostic combination: lower paraocular punctures
relatively sparse (i=1–1.5d); mesoscutum weakly imbricate, punctures moderately dense between parapsidal lines (i=1–
2d); mesepisternum tessellate-imbricate, shallow punctures visible; T1 acarinarial fan with dorsal opening; T1 declivitous
surface dull due to distinct coriarious microsculpture; and T3–T4 with sparse tomentum not obscuring surface and weak
apical fringes. They are most similar to L. paradmirandum and L. katherineae. Female L. paradmirandum have head less
robust, dense punctures on lower paraocular area (i≤d), mesoscutum tessellate, and T3–T4 with relatively dense tomentum
partially obscuring surface and strong apical fringes. Female L. katherineae have T1 acarinarial fan complete, without
dorsal opening.
Male L. fattigi are similar to females but may be further distinguished by head elongate (length/width ratio = 1.07);
flagellomeres moderately elongate (length/width ratio = 1.62–1.64), pale brownish yellow ventrally; mesepisternum
imbricate-tessellate; metapostnotum with posterior margin rounded onto vertical surface; and apical impressed areas of
metasomal terga impunctate. They are most similar to L. mitchelli and L. paradmirandum. Male L. mitchelli have posterior
margin of metapostnotum distinctly angled, mesoscutum more densely punctate, and mesepisternum rugulose. Male
L. paradmirandum have head shorter (length/width ratio = 1.03–1.04) and upper portion of mesepisternum weakly reticulate.
Range. Ontario south to Georgia. USA: GA, MA, NC, NH, NY. CANADA: ON.
DNA Barcode. Available. Multiple sequences.
Comments. Lasioglossum fattigi is usually uncommonly collected, however, a long series was examined from the
Niagara region of southern Ontario (Richards et al. 2011).
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