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 ) perpunctatum (Ellis) Halictus perpunctatus Ellis, 1913 : 210 . Ƥ. Holotype . Ƥ USA , Colorado, Boulder, 20.iv. , on Claytonia , (T.D.A. Cockerell) , [ CAS : 15617]. Examined. Halictus brycinci Crawford, 1932 : 70 . Ƥ. Holotype . Ƥ USA , North Carolina, Bryson City , 14.iv.1923 , (J.C. Crawford), [ NMNH : 40304]. Examined. Dialictus highlandicus Mitchell, 1960 : 398 . Ƥ. Holotype . Ƥ USA , North Carolina, Highlands , 22.vii.1958 [ NCSU ]. Examined. Dialictus junaluskensis Mitchell, 1960 : 437 . 3. Holotype . 3 USA , North Carolina, Lake Junaluska , 9.vi.1955 , (H.V. Weems, Jr.), [ FSCA ]. Examined. Taxonomy. Michener, 1951 : Lasioglossum ( Chloralictus ) perpunctatum , p. 1116 (catalogue); Mitchell, 1960 : Dialictus perpunctatus Ƥ3, p. 411, H . brysinci ( lapsus calami ), p. 411 (redescription, key, synonymy); Krombein, 1967 : Lasioglossum ( Dialictus ) highlandicum , p. 464, L . ( D .) junaluskense , p. 464, L . ( D .) perpunctatum , p. 465 (catalogue); Hurd, 1979 : Dialictus highlandicus , p. 1966, D . junaluskensis , p. 1967, D . perpunctatus , p. 1970 (catalogue); Moure & Hurd, 1987 : Dialictus highlandicus , p. 104, D . junaluskensis , p. 109, D . perpunctatus , p. 121 (catalogue); Gibbs 2010b : Lasioglossum ( Dialictus ) perpunctatum Ƥ3, p. 244 (redescription, key, synonymy). Diagnosis. Female L . perpunctatum can be recognised by the following diagnostic combination: head wide (length/ width ratio = 0.95–0.96); postgena polished; mesoscutal punctures dense throughout (i≤d) ( Fig. 13 A); mesepisternum punctate; metapostnotal rugae reaching posterior margin; tegula ovoid with small posterior angle; metasomal terga brown, sometimes with obscure greenish reflections; T1 acarinarial fan large, dorsal opening absent; and T3–T4 with abundant tomentum. They are similar to L . miniatulum and L . sheffieldi . Female L . miniatulum have postgena lineolate and less dense tomentum on T3. Female L . sheffieldi have head longer (length/width ratio = 1.00–1.01) and distinctly separated punctures on median portion of mesoscutum. Male L . perpunctatum can be recognised by the following combination: heads moderately elongate (length/width ratio = 1.00–1.03); flagellomeres moderately elongate (length/width ratio = 1.43–1.58); mesoscutal punctures coarse, sparse between parapsidal lines (i=1–2d); tegula with small posterior; mesepisternum distinctly punctate; metapostnotum with rugae reaching posterior margin; and metasomal terga with distinct punctures, sparser on apical impressed areas. They are similar to L . sheffieldi which has a longer head (length/width ratio = 1.06–1.08). Range. Nova Scotia west to Manitoba and Colorado, south to North Carolina. USA : CO, IN, ME, MN, NC, NJ, NY, SD, WI. CANADA : AB, MB, NS, ON, PE, SK. DNA Barcode. Available. Multiple sequences. Comments. Common. See Gibbs (2010).