Mitchell, 1960 : 386 Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini) Gibbs, Jason Zootaxa 2011 2011-10-28 3073 1 216 3SDWX Mitchell Mitchell [151,695,907,934] Insecta Halictidae Lasioglossum Animalia Hymenoptera 65 66 Arthropoda species ceanothi Dialictus     Dialictus ceanothi  Mitchell, 1960: 386. Ƥ.    Holotype.Ƥ USA, North Carolina, Wayne Co., 15.vi.1955, on  Ceanothus americanus, (H.V. Weems, Jr.); [ FSCA]. Examined.  Taxonomy. Krombein, 1967:  Lasioglossum( Dialictus) ceanothi, p. 463 (catalogue); Hurd, 1979:  Dialictus ceanothi, p. 1965 (catalogue); Moure & Hurd, 1987:  Dialictus ceanothi, p. 94 (catalogue).   Diagnosis.Female  L. ceanothican be recognised by the following diagnostic combination: head wide (length/width ratio = 0.90) ( Fig. 75B); mesoscutal punctures relatively coarse, moderately dense between parapsidal lines (i=1–1.5d) ( Fig. 76); mesepisternum reticulate-rugose; propodeal carinae weak; and T1 polished with acarinarial fan sparse but lacking a dorsal opening. They are similar to  L. foveolatumand  L. timothyi. Female  L. foveolatumhave supraclypeal area strongly protuberant lower paraocular area sparsely punctate, and parapsidal lines deep and wide. Female  L. timothyihave strong propodeal carinae ( Fig. 25A) and T1 acarinarial fan dense.  Maleunknown.   Description.FEMALE. Length 4.84–5.00 mm; head length 1.40–1.42 mm; head width 1.53–1.57 mm; forewing length 3.75–3.88 mm.  Colouration. Head and mesosoma golden green with some faint bluish reflections. Clypeus with apical half blackish brown, basal half and supraclypeal area bronze. Antenna dark brown, F2–F10 with ventral surface reddish brown. Tegula amber. Wing membrane subhyaline, venation and pterostigma amber. Legs brown, except tarsi reddish brown. Metasoma dark brown, terga and sterna reddish apically.  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 sparse subappressed tomentum not obscuring surface. Metanotum anteromedial margin with tomentum. Propodeum with moderately dense plumose hairs on lateral and posterior surfaces (2–2.5 OD). Metepisternum without tomentum. Metasomal terga with moderately dense, fine hairs. T1 acarinarial fan sparse, complete dorsally. T2–T3 basolaterally and T4 entirely with tomentum partially obscuring surface. T2 apicolateral and T3–T4 apical margins with dense apical fringes.  Surface sculpture. Face imbricate, punctation moderately coarse. Clypeus polished, basal margin imbricate, punctation moderately dense (i=1–2d). Supraclypeal area with punctation moderately dense (i=1–1.5d). Lower paraocular area punctation dense (i≤d). Antennocular area punctation moderately dense (i=1–1.5d). Upper paraocular area and frons reticulate-punctate. Ocellocular area distinctly punctate (i≤d). Gena and postgena weakly carinulate. Mesoscutum weakly imbricate, nearly polished except medially, punctation moderately coarse and dense between parapsidal lines (i=1–1.5d), dense laterad of parapsidal line (i≤d), and anterolateral portion punctate-reticulate. Mesoscutellum polished, submedial area punctation sparse (i=1.5–2.5d). Axilla punctate. Metanotum ruguloso-imbricate. Preëpisternum rugose. Hypoepimeral area and mesepisternum reticulate-rugose. Metepisternum with dorsal half rugoso-carinulate, ventral half imbricate. Metapostnotum with coarse rugae reaching posterior margin, submedially with anastomosing rugae. Propodeum with dorsolateral slope carinulate anteriorly, rugulose-imbricate posteriorly, lateral surface rugulose-imbricate, posterior surface tessellate. Metasomal terga polished except apical T1 declivitous surface and apical impressed areas weakly coriarious. T1 dorsal surface punctation sparse (i=2–5d). T2–T4 punctation moderately sparse medially (i=1–3d), denser laterally (i=1–1.5d).   FIGURE 75.  Lasioglossum ceanothi(Mitchell)female, (A) lateral habitus, (B) face. Scale bars = 1 mm.  Structure. Head very wide (length/width ratio = 0.90–0.92). Eyes convergent below (UOD/LOD ratio = 1.22–1.27). Clypeus 1/2 below suborbital tangent, apicolateral margins convergent. Antennal sockets close (IAD/OAD <0.5). Frontal line carinate, ending 2 OD below median ocellus. Supraclypeal area distinctly convex. Inner metatibial spur pectinate with 3 branches. Metapostnotum moderately elongate (MMR ratio = 1.13–1.17), narrowly rounded onto posterior surface. Propodeum with oblique carina virtually absent, lateral carina reaching 2/3 distance to dorsal margin. MALE. Unknown.  Range.North Carolina, north to Michigan, west to Missouri ( Fig. 74).  USA: MI, MO, NC.   Additional material examined.MICHIGAN: 1Ƥ  paratype[head glued to label not conspecific] Mackinac Co., 6.vii.1957(R. & K. Dreisbach); [ CUIC]; MISSOURI: 1Ƥ  paratypeWillard, 11.vi(A.E. Brower); [ CUIC]; NORTHCAROLINA: 1Ƥ  paratypeWayne Co. 15.vi.1955(H.V. Weems, Jr.); [ CUIC].  Floral records. RHAMNACEAE:  Ceanothus americanus.   DNABarcode.Unavailable.   Comments.Rare. Only specimens in the typeseries have been examined.