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Identification Summary: Small; Florida; blue scutum, dark abdomen; pitting on scutum dense but not touching, pits small, surface very dull almost beaded; head somewhat long; T1 hair fan complete and quite extensive; a small version of L. creberrimum; appressed hairs relatively sparse on abdomen; no pits on mesepisturnum.
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 dark olive green, abdomen more brassy, the terga obscurely bluish across center of discs; pubescence short, thin, entirely whitish; length and breadth of head subequal; clypeus somewhat convex, projecting about one-half below suborbital line, apical half obscurely reddened; supraclypeal area rather narrow and elongate, nearly equalling clypeus in length; eyes convergent below; lateral ocelli subequally distant from eyes and each other; mandibles and labrum ferruginous; cheeks subequal to eyes in width; face below ocelli rather dull, punctures very fine and close, becoming somewhat more obscure but more widely separated on vertex laterally, cheeks shining above, minutely and obscurely punctate, becoming very finely striate below; hypostomal carinae subparallel; lower half of face somewhat more shining, punctures distinct, somewhat more coarse than those above and more widely separated, but not sparse, those on supraclypeal area fine and rather widely separated, those on upper half of clypeus fine and very close, becoming abruptly sparse and rather coarse on apical half; scutum and scutellum dull, densely tessellate, punctures very fine and quite close medially, becoming very close laterally (much as in pilosus, fig. 99); pleura somewhat shining, obscurely subrugose; dorsal area of propodeum very finely striate and densely tessellate, lateral area somewhat shining, very minutely roughened; wings subhyaline, veins and stigma pale-testaceous; tegulae yellowish-hyaline; legs more or less reddened, mid and hind tarsi yellowish; abdomen somewhat shining, punctures very minute and close medially on each tergum, becoming sparse and very obscure laterally, apical margin only faintly but rather broadly impressed, becoming gradually yellowish-hyaline to the rim.
MALE—Length 4-5 mm.; head and thorax green, abdominal terga more piceous, with greenish reflections; pubescence short, thin, yellowish above, becoming whitish below; head very slightly longer than broad; clypeus rather short, projecting nearly two-thirds below suborbital line; supraclypeal area rather narrow, shorter than clypeus; eyes only slightly convergent below; lateral ocelli subequally distant from eyes and each other; antennae slightly nearer each other than to eyes, basal segment of flagellum about as broad as long, 2nd and following segments nearly twice this length, brownish-testaceous beneath, piceous above; mandibles and labrum yellowish; cheeks sub- equal to eyes in width; face below ocelli dull, punctures rather deep and distinct but densely crowded, almost rugose, becoming somewhat more distinct on vertex; cheeks above minutely and obscurely punctate, becoming rather smooth and shining below; hypostomal carinae subparallel; lower half of face somewhat shining, punctures deep, distinct and only slightly separated between antennae and eyes, supraclypeal area rather dull, with fine punctures, those on clypeus close in general, largely obscured by tomentum; punctures of scutum and scutellum fine and close but deep and distinct, only slightly separated in center of scutum, otherwise nearly contiguous, scutellum with a median line of rather close, fine punctures, rather sparsely punctate on each side; pleura rather closely and obscurely punctate; dorsal area of propodeum rather broad, densely tessellate, with fine, short striations along basal margin, posterior margin rather indefinite, lateral faces somewhat shining, finely lineolate; wings subhyaline, veins and stigma brownish, 2nd submarginal cell very short; tegulae brownish-hyaline, with darker blotches; legs piceous basally, tibiae yellow at base and apex, and tarsi entirely yellow; abdominal terga shining, punctures close and fine on discs, apical margins broadly impressed, impunctate; apical margin of sterna 4 and 5 broadly incurved; median lobe of sternum 7 accuminate apically; gonostylus of armature as shown (fig. 102), retrorse lobe rather short and narrow, finely short pubescent.
Extracted from Jason Gibbs. 2011. Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini.) Zootaxa.
Lasioglossum (Dialictus) tamiamense (Mitchell)
Dialictus tamiamensis Mitchell, 1960: 421. ♀ ♂.
Holotype. ♀ USA, Florida, Olga, 29.iii.1954, on sand flats (K.V. Krombein); [NMNH: 66070]. Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) tamiamense, p. 466 (catalogue); Moure and Hurd, 1987: Dialictus tamiamensis, p. 133 (catalogue).
Diagnosis. Female L. tamiamense can be recognised by the following diagnostic combination: head long (length/
width ratio = 1.08–1.09) (Fig. 204B); mesoscutal punctures dense, except along medial line (Fig. 205); metapostnotal
rugae very fine, obscure among tessellate background (Fig. 205); T1 acarinarial fan large, complete (Fig. 205), intermixed
with erect hairs dorsally; and T2 apical impressed area with distinct but fine punctation. They are most similar to L.
halophitum and L. creberrimum. Female L. halophitum have mesoscutal punctures sparse over most of disc only becoming dense adjacent to the parapsidal lines (Fig. 122). Female L. creberrimum have T1 acarinarial fan smaller without intermixed erect hairs dorsally, and T2 apical impressed area with very obscure punctation.
Male L. tamiamense can be recognised by the following diagnostic combination: head long (length/width ratio =1.07) (Fig. 206B), clypeus with distal margin brownish yellow (Fig. 206B), mesoscutal punctures contiguous (i
Redescription. FEMALE. Length 4.60–5.02 mm; head length 1.52–1.54 mm; head width 1.40–1.42 mm; forewing length 3.39–3.45 mm.
Colouration. Head and mesosoma blue with greenish reflections. Clypeus with apical half blackish brown. Supraclypeal area bronze. Antenna dark brown, flagellum with ventral surface reddish brown. Tegula brownish yellow. Wings faintly dusky, venation and pterostigma brownish yellow. Legs brown, except medio- and distitarsi reddish brown. Metasomal terga and sterna brown, apical margins translucent brownish 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. T2–T5 lateral portions with sparse tomentum. T2 apicolateral and T3–T4
apical margins with sparse fringes.
Surface sculpture. Face imbricate, punctation fine. Clypeus punctation dense (i≤d). Supraclypeal area with punctation
moderately dense (i≤d). 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 fine,
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
Structure. Head elongate (length/width ratio = 1.08–1.09). Eyes convergent below (UOD/LOD ratio = 1.23–1.26).
Clypeus ½ below suborbital tangent, apicolateral margins weakly convergent. Antennal sockets close (IAD/OAD < 0.5).
Frontal line carinate, ending 2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with
3–4 branches. Metapostnotum truncate (MMR ratio = 1.30–1.35), posterior margin narrowly rounded onto posterior surface.
Propodeum with oblique carina fine, lateral carina weak, reaching halfway to dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 3.81 mm; head length 1.39 mm; head width 1.30 mm; forewing length 2.96 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 brownish yellow.
Pubescence. Paraocular area below eye emargination with tomentum obscuring surface. Clypeus largely obscured by tomentum. S2–S3 with posteriorly directed hairs (1–1.5 OD), S4–S5 apical margins with dense hairs.
Surface sculpture. Mesoscutellar punctation dense (i
Structure. Head elongate (length/width ratio = 1.07). Eyes strongly convergent below (UOD/LOD ratio = 1.38). Clypeus 2/3 below suborbital tangent, apicolateral margins subparallel. Antennal sockets distant (IAD/OAD > 0.7). Frontal line carinate, ending 2 OD below median ocellus. Pedicel shorter than F1. F2 length 1.8X F1. F2–F10 moderately elongate (length/width ratio = 1.50–1.60). Metapostnotum elongate (MMR ratio = 1.28), posterior margin rounded onto posterior surface. S5 deeply concave.
Terminalia. S7 with median lobe acuminate. S8 with apicomedial margin weakly convex. Gonobase with ventral arms separated. Volsella roughly ovoid. Gonostylus long, dorsal setae elongate. Retrorse lobe elongate, attenuated apically.
Range. Florida (Fig. 199).
Additional material examined. USA: FLORIDA: 1♀ Highlands Co., Archbold Biological Station, N27.18833
W081.33778, 18.iii.2002 (J.S. Ascher); 1♂ Putnam Co., Crescent City, N29.43 W081.5108, 20.iv.1908 (Van Duzee);
[AMNH];; 1♀ paratype Punta Gorda, 11.iv.1962 (J.R. Vockeroth); [CNC]; 2♀♀ paratypes East end Tamiami Trail,
22.vi.1949 (T.B. Mitchell); 6♀♀ paratype Marion Co., 8.iv.1956 (R.A. Morse); 1♂ Punta Gorda, 17.xi.1911; 1♀ Highlands
Co., Archbold Bio. Res. Stn., 14.iv.1963 (J.G. & B.L. Rozen); 1♂ Highlands Co., Highland Hammock S.P.,
13.iv.1974 (G.C. Eickwort); 1♀ Alachua Co., 13.ii.1930 (C.J. Guard); 1♂ Columbia Co., 22.i.1930 (R.B. Howard); 1♀
Orange Co., 7–15.ii.1930 (W.M. Loe)); 1♀ Volusia Co., 29.i.1930 (W.A. Hiers); 1♀ Union, Walton Co., 23.xii.1929 (R.B.
Howard); [CUIC]; 1♀ (Halictus ashmeadi paratype) Inverness (C. Robertson); [INHS]; 4♀♀ paratypes East end
Tamiami Trail, 22.vi.1949 (T.B. Mitchell); 4♀♀ paratypes Marion Co., 6.iv.1956 (R.A. Morse); 2♀♀ paratypes Marion
Co., 17.iv.1956 (R.A. Morse); 1♀ paratype Olga, 29.iii.1954 (K.V. Krombein); 1♂ paratype Olga, 30.iii.1954 (K.V.
Krombein); 2♀♀ paratypes Volusia Co., 10.viii.1936 (H.A. Denmark); [NCSU]; 1♂ paratype Olga, on sand flats,
30.iii.1954 (K.V. Krombein); [NMNH].
Floral records. ASTERACEAE: Bidens pilosa, Erigeron quercifolius; FABACEAE: Chamaecrista fasciculata, Medicago “lupina”, Melilotus officinalis, Trifolium repens; HYDROPHYLLACEAE: Hydrolea ovata; LAMIACEAE:Stachys floridana.
DNA Barcode. Available. Single sequence.
Comments. Uncommon.
Several paratypes of L. tamiamense are in fact L. creberrimum (one paratype from Alachua county is a L. puteulanum).
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