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 ) admirandum (Sandhouse) Halictus ( Chloralictus ) admirandus Sandhouse, 1924 : 14 . Ƥ. Holotype . Ƥ USA , Woods Hole, Massachusetts (E. Cattell), [ NMNH : 26405]. Examined. Dialictus perspicuus Knerer and Atwood, 1966a : 883 . Ƥ 3. Holotype . Ƥ CANADA , Ontario, Iona, Elgin Co., 15.ix.1963 on Solidago , (G. Knerer) ; [ ROM : 83647]. Examined. Taxonomy. Michener, 1951 : Lasioglossum ( Chloralictus ) admirandum p. 1111 (catalogue); Mitchell, 1960 : Dialictus admirandus Ƥ, p. 377 (redescription); Krombein, 1967 : Lasioglossum ( Dialictus ) admirandum , p. 462 (catalogue); Hurd, 1979 : Dialictus admirandus , p. 1963, D . perspicuus , p. 1970 (catalogue); Moure & Hurd, 1987 : Dialictus admirandus , p. 88, D . perspicuus , p. 121 (catalogue); Gibbs, 2010b : Lasioglossum ( Dialictus ) admirandum Ƥ3, p. 52 (redescription, key, synonymy). Diagnosis. Female L . admirandum can be recognised by the following diagnostic combination: head moderately elongate (length/width ratio = 0.95–1.01); clypeus with apicolateral margins convergent ( Fig. 21 A); mesoscutum densely tessellate, punctures sparse between parapsidal lines (i=1–3d); tegula pale translucent brownish yellow; mesepisternum weakly rugulose; metapostnotal rugae not reaching posterior margin; T1 acarinarial fan with dorsal opening; T1 anterior declivitous portion polished due to lack of microsculpture; metasomal terga brown, distinctly punctate throughout; and T3–T4 with abundant tomentum. They are most similar to L . paradmirandum and L . sagax . Female L . paradmirandum have mesepisternum tessellate and T1 declivitous portion distinctly coriarious. Female L . sagax have apical half of T2 nearly impunctate. Male L . admirandum are similar to females except with head elongate (length/width ratio = 1.01–1.04); clypeus with yellow distal band; face with abundant tomentum obscuring surface below; flagellomeres elongate (length/width ratio = 1.57–1.82), yellow ventrally; tibial apices and bases with extensive yellow; and apical impressed areas of metasomal terga impunctate. They are most similar to L . sagax , which has mesoscutum relatively polished due to weak microsculpture. Range. Ontario south to Georgia , west to Saskatchewan, Minnesota. USA : CT, IN, MA, MD, MI, MN, NY, WI. CANADA : ON, SK. DNA Barcode. Available. Multiple sequences. Comments. Uncommon. Gibbs (2010b) reported a smaller range for L . admirandum but additional material has since been identified from CUIC. Most L . admirandum have the head and mesosoma primarily green but some individuals have stronger blue reflections. The holotype of H . admirandus belongs to the latter category whereas the holotype of D . perspicuus is a green form.