Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini) Author Gibbs, Jason text Zootaxa 2011 2011-10-28 3073 1 216 journal article 31531 10.5281/zenodo.1049595 1a985cc7-af57-45e9-a988-c3beda3c15b4 1175-5326 1049595 B5AF6DF4-D3A7-4942-A94F-CC051D8074CF Lasioglossum ( Dialictus ) fattigi (Mitchell) Dialictus fattigi Mitchell, 1960 : 392 . Ƥ. Holotype . Ƥ 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 Ƥ3, 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 ).