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 ) heterognathum (Mitchell) Dialictus heterognathus Mitchell, 1960 : 397 . Ƥ. Holotype . Ƥ USA , North Carolina, Grandfather Mt. , 27.vi.1952 , [ NCSU ]. Examined. Dialctus banksi Mitchell, 1960 : 434 . 3. Lapsus calami . Holotype . 3 USA , North Carolina, West End , 14.vi.1950 , (Mitchell); [ NCSU ]. Examined. Taxonomy. Knerer and Atwood, 1963 : Dialictus heterognathus 3, p. 167 (description); Knerer and Atwood, 1966a : D . heterognathus , p. 882 (synonymy); Krombein, 1967 : Lasioglossum ( Dialictus ) heterognathum , p. 463 (catalogue); Hurd, 1979 : Dialictus heterognathus , p. 1966 (catalogue); Moure & Hurd, 1987 : Dialictus heterognathus , p. 103 (catalogue); Gibbs, 2010b : Lasioglossum ( Dialictus ) heterognathum Ƥ3, p. 136 (redescription, key). Diagnosis. Female L . heterognathum can be recognised by the following diagnostic combination: hypostomal carinae divergent towards mandible bases ( Fig. 10 B), gena wider than eye, mesoscutal punctures fine, and scopa present. They are similar to L . apocyni and L . imitatum , which both have hypostomal carinae parallel and female L . imitatum have T3–T4 with coarse white hairs ( Fig. 20 A). Male L . heterognathum can be recognised by the following diagnostic combination: facial tomentum dense only on lower paraocular area; flagellomeres elongate (length/width ratio = 1.50–1.85); dorsolateral angles of pronotum obtuse; mesoscutum dull due to weak microsculpture, punctures sparse between parapsidal lines (i=2–3d); mesepisternal punctures fine but distinct (i=1–3d); and apical impressed areas of the metasomal terga impunctate. They are most similar to L . wheeleri , which have pronotal dorsolateral angles acute. Range. Nova Scotia to Ontario, west to Minnesota, and south to North Carolina. USA : CT, ME, MI, MN, NH, NY, NC, PA, VT, WV, WI. CANADA : NB, NS, ON, PQ. DNA Barcode. Available. Multiple sequences. Comments. Common. See Gibbs (2010b) .