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Identification Summary: Moderate sized; Florida; mandibles, lower clypeus and legs entirely yellow-orange; mesepisternum sparsely pitted.
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 4.5 mm.; head and thorax greenish, abdominal terga piceous with broadly ferruginous apical rims, tegulae, tubercles and nearly the entire prothorax, all the legs, including the coxae, apical half of clypeus, with the labrum and mandibles, and flagellum, bright ferruginous; pubescence very short, thin and inconspicuous, entirely pale; length and breadth of head subequal; clypeus convex, rather narrow, somewhat protuberant, projecting about one-half below suborbital line; eyes convergent below; lateral ocelli very slightly nearer eyes than to each other; cheeks subequal to eyes in width; face below ocelli dull, very densely and finely punctate, punctures becoming obscure on the more shining vertex and upper cheeks, these becoming finely striate below, hypostomal carinae parallel; lower half of face more shining, punctures more distinctly separated, very fine and sparse on supraclypeal area and upper portion of clypeus, these becoming more coarse and deep but quite sparse toward apical margin; scutum and scutellum somewhat shining, punctures minute, well separated but hardly sparse, somewhat closer laterally (much as in inconspicuus, fig. 99); pleura somewhat shining, with scattered, fine, shallow but distinct punctures; dorsal area of propodeum with fine, incomplete striae, posterior margin somewhat rounded and smooth, lateral faces shining and quite smooth; wings hyaline, veins and stigma brownish; abdominal terga shining, very minutely and obscurely punctate, punctures scattered irregularly, basal tergum becoming more minute but regularly distributed on the median terga, inevident on the apical ones.
Lasioglossum (Dialictus) tarponense (Mitchell)
Extracted by Gibbs J., 2011. Revision of the metallic Lassioglossum (Dialictus) of the eastern North American (Hymenoptera: Halictidae: Halictini). Zootaxa.
Dialictus tarponensis Mitchell, 1960: 423. ♀.
Holotype. ♀ USA, Florida, Tarpon Springs, 21.iii.1950 (H.K. Townes); [NCSU]. Examined.
Dialictus placidensis Mitchell, 1960: 441. ♂.
Holotype. ♂ USA, Florida, Lake Placid, 27.xii.1956 (K.V. Krombein); [NCSU]. Examined.
Taxonomy. Krombein, 1967: Lasioglossum (Dialictus) placidense, p. 466, L. (D.) tarponense, p. 466 (catalogue); Moure
and Hurd, 1987: Dialictus placidensis, p. 124, D. tarponensis, p. 133 (catalogue).
Diagnosis. Both sexes of L. tarponense can be recognised by the following diagnostic combination: legs nearly entirely yellowish orange (Fig. 209), clypeus yellowish orange (Figs. 207B, 209B), and mesepisternum punctate.
Redescription. FEMALE. Length 4.41 mm; head length 1.32 mm; head width 1.27 mm; forewing length 3.45 mm.
Colouration. Head and mesosoma pale green to pale blue. Labrum and mandible yellowish orange. Clypeus with apical half yellowish orange. Antenna dark brown, flagellum with ventral surface reddish brown. Pronotal lobe brownish yellow. Tegula amber. Wing membrane subhyaline, venation and pterostigma brown. Legs yellowish orange. Metasoma reddish brown, terga and sterna with apical margins translucent brownish yellow.
Pubescence. Dull white. Moderately sparse. Head and mesosoma with moderately sparse woolly hairs (1–2 OD), longest on genal beard, metanotum, and mesopleuron (2–2.5 OD). Paraocular area and gena with moderately dense subappressed tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metasomal terga with moderately sparse, fine hairs. T1 acarinarial fan complete, without dorsal opening. T2–T3 with basolateral tomentum. T4 with scattered tomentum. T2 apicolateral and T3–T4 apical margins with sparse fringes.
Surface sculpture. Face imbricate, punctation fine. Clypeus with apical half polished, punctation moderately sparse
(i=1–2d). Supraclypeal area with punctation moderately sparse (i=1–2.5d), denser laterally. Lower paraocular area punctation
dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area and frons very
finely punctate. Ocellocular area punctate (i≤d). Gena and postgena lineolate. Mesoscutum weakly tessellate-imbricate, polished submedially, punctation sparse between parapsidal lines (i=1–2.5d), denser laterad of parapsidal line (i=1–1.5d),and on anterolateral portion (i≤d). Mesoscutellum similar to mesoscutum, submedial punctation sparse (i=1.5–5d). Axilla minutely punctate. Metanotum imbricate-punctate. Preëpisternum imbricate-rugulose. Hypoepimeral area imbricatepunctate(i=1–1.5d). Mesepisternum distinctly punctate (i=1–2d), interspaces tessellate dorsally, weakly imbricate to polished ventrally. Metepisternum with dorsal half rugoso-carinulate, ventral portion imbricate. Metapostnotum with short rugae extending approximately 2/3 distance to posterior margin, posterior margin weakly imbricate. Propodeum with dorsolateral slope imbricate, lateral and posterior surfaces tessellate. Metasomal terga weakly coriarious, punctation moderately dense basally (i=1-1.5d), T2 apical impressed area similarly punctate (i=1–2.5d) but extremely obscure.
Structure. Head moderately elongate (length/width ratio = 1.04). Eyes convergent below (UOD/LOD ratio = 1.23). Clypeus 1/2–2/3 below suborbital tangent, apicolateral angle convergent. Antennal sockets close (IAD/OAD < 0.5).Frontal line carinate, ending 2–2.5 OD below median ocellus. Gena narrower than eye. Inner metatibial spur pectinate with 3 branches. Metapostnotum moderately elongate (MMR ratio = 1.30), posterior margin rounded onto posterior surface.
Propodeum with oblique carina absent, lateral carina not reaching dorsal margin.
MALE. Similar to female except for the usual secondary sexual characters and as follows. Length 4.17 mm; head length 1.31 mm; head width 1.19 mm; forewing length 3.39 mm.
Colouration. Flagellum with ventral surface brown.
Pubescence. Paraocular area with moderately dense tomentum. S2–S4 apical halves with moderately dense hairs(1.5 OD).
Surface sculpture. Punctation coarser. Mesoscutum polished, weakly imbricate medially. Mesepisternum polished, punctate. Metapostnotal rugae nearly reaching posterior margin. Metasomal terga with apical impressed areas impunctate.
Structure. Head elongate (length/width ratio = 1.10). Eyes strongly convergent below (UOD/LOD ratio = 1.55). Clypeus 2/3 below suborbital tangent, apicolateral margins convergent. Antennal sockets distant (IAD/OAD > 0.9). Frontal line carinate, ending 2 OD below median ocellus. Pedicel subequal to F1. F2 length 1.6X F1. F2–F10 moderately elongate (length/width ratio = 1.56–1.70). Metapostnotum elongate (MMR ratio = 1.16), posterior margin rounded onto posterior surface.
Terminalia. S7 with median lobe narrowly clavate, sides subparallel, apex rounded (Fig. 211). S8 with apicomedial margin weakly convex (Fig. 211). Genital capsule as in Fig. 211. Gonobase with ventral arms narrowly separated. Volsella roughly ovoid. Gonostylus small, dorsal setae elongate. Retrorse lobe elongate, attenuated apically.
Range. South-eastern USA (Fig. 212). USA: FL, GA, NC, TX.
Additional material examined. USA: FLORIDA: 1♀ Leon Co., Apalachicola National Forest, "ant heaven",
N30.31687 W084.50008, 20–27.vi.2005 (Ronquist Lab); [AMNH]; 11♀♀ 1♂ Alachua Co., Gainesville, 16.ix.1977 (L.
Masner); 7♀♀ 2♂♂ Highland Co., Lake Placid, Archbold Biol. Stn., 8–14.ix.1987 (BRC Hym. Team); 4♀♀ Highland
Co., Lake Placid, Archbold Biol. Stn., 15–21.ix.1987 (BRC Hym. Team); 5♀♀ 1♂ Highland Co., Lake Placid, Archbold
Biol. Stn., 21–27.ix.1987 (BRC Hym. Team); 2♀♀ 2♂♂ Highlands Co., Archbold Biol. Stn., 9–16.vi.1987 (D.B. Wahl);
[CNC]; 1♀ paratype Alachua Co., 17.ii.1955 (H.V. Weems, Jr.); 1♀ paratype Alachua Co., 16.iii.1955 (H.V. Weems, Jr.);
1♂ (D. placidensis paratype) Manatee Co., Oneco, 25.iii.1954 (G.E. Ball); [CUIC]; 1♀ Highland Co., N27.43
W081.3911, 3.vi.2007 (S.W. Droege); 1♀1♂ Martin Co., N27.0204 W080.1069, 4.vi.2007 (S.W. Droege); 1♀ Martin
Co., N27.0125 W080.1028, 4.vi.2007 (S.W. Droege); [PCYU]; 6♂♂ Brevard Co., Titusville, 31.viii–14.ix.2000 (Z.
Prusak, P.J. Russell, S. Fullerton); 1♂ Orange Co., Orlando, 4.vi.1993 (S.M. Fullerton); Orange Co.,Walt Disney World,
14–21.iv.1998 (Z. Prusek, S. Fullerton); [UCFC]; GEORGIA: 1♀ paratype Tybee Is., 20.iv.1911; [CUIC]; 1♀1♂ Liberty
Co., St. Catherines Isl., south beach area, 22–27.vi.1995 (A. Sharkov); [PCYU]; TEXAS: 1♀ Nacogdoches Co., N31.501
W094.7639, 2–16.vi.2010 (C. Adams).
Floral records. ROSACEAE: Prunus angustifolia.
DNA Barcode. Available. Multiple sequences.
Comments. Common.
The synonymy of L. tarponense and D. placidensis was first recognized by George Eickwort (see Deyrup et al.2002).
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