Identification Summary: Moderate-sized; long-headed; beaded scutum; very similar to L. tamiamense; T1 fan complete but very slightly open at top; pitting on scutum around 1 pit diameter to nearest neighbor; seems associated with wetlands and marshes.
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 green, abdomen more metallic green, tergum 2 somewhat bluish across center of disc; pubescence entirely pale, quite short and thin, somewhat more copious on cheeks, on thorax laterally, and on apical half of abdomen; head very slightly longer than broad; clypeus convex, somewhat protuberant, projecting about two-thirds below suborbital line; supraclypeal area elongate, subequal to clypeus in length; eyes slightly convergent below; lateral ocelli subequally distant from eyes and each other; cheeks subequal to eyes in width; face below ocelli dull, very finely and closely punctate, with punctures deep and distinct, becoming somewhat more obscure and more widely separated laterally on the densely tessellate vertex, cheeks shining, obscurely punctate above, becoming finely striate below, hypostomal carinae parallel; lower half of face rather dull and tessellate, the punctures more coarse, deep and distinct, well separated, but not sparse, those on supraclypeal area and upper half of clypeus finer, quite close, becoming more coarse and sparse on clypeus apically; scutum and scutellum densely tessellate, punctures rather deep and distinct, distribution similar to weemsi (fig. 99) ; pleura rather dull, finely rugoso-striate; dorsal area of propodeum finely and completely striate laterally, mostly tessellate medially, with only a few faint basal striations in evidence, and a single indefinite median striae, lateral areas somewhat shining, finely roughened; wings subhyaline, veins and stigma testaceous; tegulae more ferruginous; legs dark, becoming somewhat reddish on tarsi apically; abdomen shining, punctures exceedingly minute and obscure but quite close, apical margins faintly impressed, rather broadly so on terga 2 and 3, pubescence rather copious on apical terga, but not hiding the surface.
MALE—Length 5 mm.; head and thorax green, abdomen more brassy-green; pubescence short, thin, entirely pale, somewhat more copious on cheeks and on thorax laterally; head considerably longer than broad; clypeus convex, rather narrow, projecting about one-half below suborbital line; supraclypeal area elongate, nearly equal to clypeus in length; eyes slightly convergent below, lateral ocelli sub- equally distant from eyes and each other; antennae very slightly nearer to each other than to eyes, basal segment of flagellum very slightly longer than broad, the following segments somewhat longer, testaceous beneath, darker above; mandibles slender, yellowish, but reddish apically, clypeus yellow on apical margin, labrum yellow; cheeks very slightly broader than eyes; face below ocelli dull, very densely and finely punctate, punctures becoming more obscure on the tessellate vertex, cheeks more shining, obscurely punctate above, becoming very finely striate below, hypostomal carinae parallel; lower half of face somewhat more shining, punctures deep and distinct, well separated, but not sparse, those on supraclypeal area and upper portion of clypeus very fine, well separated but not sparse, becoming somewhat more sparse, but still very fine toward apical margin of the clypeus; scutum and scutellum dull and densely tessellate, punctures very fine, slightly separated in center of disc, but very close laterally; pleura somewhat more shining but very finely rugoso-striate; dorsal area of propodeum distinctly striate laterally, more tessellate, medially, where there are a few short basal striations, otherwise tessellate and rather dull, lateral surfaces somewhat shining and finely roughened; wings subhyaline, veins and stigma brownish-testaceous; tegulae yellowishhyaline; basal segments of legs piceous, tibiae brownish medially, with yellow base and apex, tarsi entirely yellow; abdominal terga shining, very minutely but rather closely punctate, apical margin slightly impressed, narrowly so on more basal terga, rather widely on terga 3 and 4; apical margin of sternum 5 nearly straight; median lobe of sternum 7 broad and rather short, rounded and somewhat narrowed apically; gonostylus of armature as shown (fig. 102), retrorse lobe very short, narrowly rounded apically, largely covered with short and fine pubescence.
DISTRIBUTION—North Carolina to Florida and Louisiana; March to September, throughout the year in Florida.
FLOWER RECORDS—Aronia, Eryngium, Hypericum, Kalmia and Oenothera.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) creberrimum (Smith)
Halictus creberrimus Smith, 1853: 72. ♀
Holotype. ♀ N. America; [BMNH]. Examined.
Halictus ashmeadii Robertson, 1892: 269. ♀.
Lectotype. ♀ USA, Florida, Inverness, 12.ii.1891 (C. Robertson); [INHS: 9989]. Examined.
Halictus ashmeadi Cockerell, 1906: 294 (emend.).
Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) ashmeadii, p. 1112, L. (C.) creberrimum, p. 1113 (catalogue);
Mitchell, 1960: Dialictus creberrimus ♂♀, p. 389 (redescription, key, synonym); Krombein, 1967: Lasioglossum (Dialictus)
creberrimum, p. 463 (catalogue); Moure and Hurd, 1987: Dialictus creberrimus, p. 97 (catalogue).
Diagnosis. Female L. creberrimum can be recognised by the following diagnostic combination: head elongate
(length/width ratio = 1.05–1.09) (Fig. 85B); mesoscutal punctures dense, except along medial line (Fig. 86); metapostnotal
rugae very fine, medially obscure among tessellate background (Fig. 86); T1 acarinarial fan without intermixed erect
hairs dorsally; and T2 apical impressed area dull with extremely obscure punctures. They are most similar to L. halophitum
and L. tamiamense. Female L. halophitum have mesoscutal punctures sparse medially (i=1–3d), only becoming
dense adjacent to the parapsidal lines. Female L. tamiamense have T1 acarinarial fan with intermixed erect hairs dorsally
and T2 apical impressed area smoother with distinct, but fine punctures.
Male L. creberrimum can be recognised by the following diagnostic combination: head elongate (length/width ratio
= 1.19) (Fig. 87B); clypeus with distal margin brownish yellow (Fig. 87B); and mesoscutal punctures contiguous, except
sparser medially (i=1–1.5d) (Fig. 88); mesoscutellar punctures sparser (i=1–1.5d); T1–T2 at most narrowly impunctate at
apical margin; and S5 apical margin weakly concave with sparse apicolateral hairs. They are most similar to male L. halophitum
and L. tamiamense. Male L. halophitum have clypeus blackish brown distally and mesoscutum sparsely punctate
medially (i=1–3d). Male L. tamiamense have mesoscutellar punctures dense (i
Redescription. FEMALE. Length 3.99–5.45 mm; head length 1.34–1.64 mm; head width 1.27–1.51 mm; forewing
length 2.84–3.63 mm.
Colouration. Head and mesosoma pale green to bluish green. Clypeus with apical half blackish brown. Supraclypeal
area bronze. Antenna dark brown, flagellum with ventral surface reddish brown. Tegula reddish. Wings faintly dusky,
venation and pterostigma yellowish brown. Legs brown, except protibial base and medio- and distitarsi reddish brown.
Metasomal terga and sterna brown, apical margins pale, translucent yellow.
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 without subappressed tomentum. Propodeum
with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately
dense, fine hairs. T1 acarinarial fan complete. T1 apicolateral portion with sparse tomentum. T2–T3 basal and lateral portions,
T4–T5 with sparse tomentum obscuring surface. T2–T4 apical margins with moderately sparse fringes.
Surface sculpture. Face tessellate-imbricate, punctation fine. Clypeus punctation (i=1–2.5d). 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 lineolate. Mesoscutum tessellate,
punctation dense on medial portion of disc (i=1–1.5d), punctate-reticulate mesad and laterad of parapsidal line and on
anterolateral portion. Mesoscutellum weakly imbricate-tessellate, submedial punctation moderately dense (i=1–1.5d).
Axilla punctate. Metanotum imbricate. Preëpisternum rugose. Hypoepimeral area rugulose. Mesepisternum rugose, rugulose
posteriorly. Metepisternum with dorsal half rugoso-carinulate, ventral half imbricate. Metapostnotum with very
weak rugae, posterior margin tessellate-granular. Propodeum with dorsolateral slope carinulate, lateral surface rugulosetessellate,
posterior surface tessellate. Metasomal terga weakly coriarious, punctation moderately dense throughout (i=1–
1.5d), very fine and obscure on apical impressed areas.
Structure. Head elongate (length/width ratio = 1.05–1.09). Eyes convergent below (UOD/LOD ratio = 1.21–1.27).
Clypeus ˝ below suborbital tangent, apicolateral margins weakly 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 branches. Metapostnotum truncate (MMR ratio = 1.37–1.47), posterior margin weakly angled onto posterior surface.
Propodeum with oblique carina fine, lateral carina weak, nearly reaching dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 3.69–4.11 mm;
head length 1.37–1.56 mm; head width 1.22–1.28 mm; forewing length 2.66 mm.
Colouration. Labrum, mandible and distal margin of clypeus yellow. Flagellum with ventral surface brownish yellow.
Legs brown, except tibial bases and apices and tarsi yellow.
Pubescence. Paraocular area below eye emargination with tomentum obscuring surface. Clypeus with sparse tomentum
not obscuring surface. T2–T4 lateral portions with sparse tomentum. S2–S3 apical halves and S4–S5 apicolaterally
with sparse posteriorly directed hairs (1–1.5 OD).
Surface sculpture. Mesoscutal punctation sparse on posterior half (i=1–2.5d). Mesoscutellar punctation moderately
sparse (i=1–3d). Metasomal terga with apical impressed areas sparsely punctate.
Structure. Head very elongate (length/width ratio = 1.12–1.18). Eyes strongly convergent below (UOD/LOD ratio =
1.33–1.36). Clypeus 2/3 below suborbital tangent, apicolateral margins subparallel. Supraclypeal area longer than wide.
Antennal sockets distant (IAD/OAD > 0.6). Frontal line carinate, ending 2.5 OD below median ocellus. Median ocellus
above upper orbital tangent. Pedicel shorter than F1. F2 length 1.5X F1. F2–F10 elongate (length/width ratio = 1.60–
1.78). Metapostnotum relatively elongate (MMR ratio = 1.15–1.22), posterior margin rounded onto posterior surface.
Terminalia. S7 with median lobe acuminate (Fig. 89). S8 with apicomedial margin weakly convex (Fig. 89). Genital
capsule as in Fig. 89. Gonobase with ventral arms widely separated. Volsella roughly ovoid. Gonostylus small, dorsal
setae elongate. Retrorse lobe relatively short, strongly attenuated apically.
Range. Maryland south to Florida, west to Texas (Fig. 84). USA: FL, GA, LA, MD, MS, NC, SC, TX.
Additional specimens examined. USA: FLORIDA: 1♀ Highlands Co., Archbold Biological Station, N27.18833
W081.33778, 31.iii.2009 (J.S. Ascher, D. Webber), 1♀ Highlands Co., Archbold Biological Station, N27.18833
W081.33778, 31.iii.2009 (J.S. Ascher, H.G. Hall, D. Webber); [AMNH]; 1♀ Everglades N.P., 23.iv.1961 (L.A. Kelton);
[CNC]; 1♀ Brighton, 10.iv.1937 (J.C. Bradley); 1♀ Inverness (C. Robertson); 1♀ Punta Gorda, 11.xi.11; 1♂ Alachua Co.;
1♀ Franklin Co., Carrabelle, 23.iii.1981 (L.L. Pechuman); [CUIC]; 6♀♀ (Halictus ashmeadi paratypes) Inverness (C.
Robertson); [INHS]; 1♀ Collier Co., N26.1676 W081.0757, 27.i.2005 (S.W. Droege); 1♀ Martin Co., N27.0916
W080.1291, 4.vi.2007 (S.W. Droege); [PCYU]; 1♀ Orange Co., Orlando, 4.iii.1992 (S.M. Fullerton); [UCFC]; 1♀
Inverness (C. Robertson); [UCMC]; GEORGIA: 1♀ Rabun Co., Rabun Bald, 4200 ft., 16.vii.1957 (J.G. Chilcott);
[CNC]; 1♀ Colquitt Co., Reed Bingham S.P., 23.v.1981 (G.C. Eickwort et al.); [CUIC]; 5♀♀ Liberty Co., St. Catherines
I., N31°40.9′ W081°8.8′m 23–28.vi.1996 (A. Sharkov); [PCYU]; LOUSIANA: 1♀ Sabine River Ferry, 20.vi.1917;
[CUIC]; MARYLAND: 1♀ Dorchester Co., N38.432 W076.1589, 21.viii.2003 (S.W. Droege); 1♀ Dorchester Co.,
N38.4597 W076.1394, 21.viii.2003 (S.W. Droege); 1♀ Somerset Co., N37.9938 W075.7305, 8.v.2002 (S.W. Droege);
[PCYU]; MISSISSIPPI: 3♀♀ Jackson Co., N30.3802 W088.7383, 4–5.vi.2005 (S.W. Droege); 1♀ Jackson Co.,
N30.3992 W088.766, 4–5.vi.2005 (S.W. Droege); [PCYU]; NORTH CAROLINA: 4♀♀ Raleigh, 3.v.1951 (T.B.
Mitchell); [NCSU]; 2♀♀ Dare Co., N35.8064 W075.7668, 7.vi.2005 (S.W. Droege); 1♀1♂ Hyde Co., N35.4164
W076.1625, 7.vi.2005 (S.W. Droege); [PCYU]; SOUTH CAROLINA: 6♀♀ Dillon Co., Dillon, N34.41655
W079.37116, 34 m, 25.iv.1923; [AMNH]; 2♀♀ C. Sandhills NWR, N34.6072 W080.2183, 7.ix.2006 (S.W. Droege);
[PCYU]; TEXAS: 1♀ Tyler Co., N30.548 W094.409, 19.iv.2008 (J.L. Neff); [CTMI].
Floral records. APIACEAE: Eryngium; CLUSIACEAE: Hypericum; ERICACEAE: Kalmia; ONAGRACEAE:
Oenothera;; ROSACEAE: Photinia, Rubus.
DNA Barcode. Available. Multiple sequences.