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 ) lionotum (Sandhouse) Dialictus lionotus Sandhouse, 1923 : 194 . 3. Holotype . 3 USA , Colorado ( Baker ); [ NMNH ]. Examined. Paralictus asteris Mitchell, 1960 : 446 . Ƥ 3. [new synonymy] Holotype . Ƥ USA , North Carolina, Cliffs of the Neuse State Park, Wayne Co., 21.x.1955 ; [ NCSU ]. Taxonomy. Michener, 1951 : Lasioglossum ( Dialictus ) lionotum , p.1119; Krombein, 1967 : Lasioglossum ( Paralictus ) asteris , p. 467 (catalogue); Hurd, 1979 : Dialictus lionotus , p. 1968; Paralictus asteris , p. 1974 (catalogue); Moure & Hurd, 1987 : Dialictus lionotus , p. 111; Paralictus asteris , p. 142 (catalogue); Gibbs, 2010b : Lasioglossum ( Dialictus ) asteris Ƥ3, p. 69 (redescription, key). Diagnosis. Female L . lionotum can be recognised by the following diagnostic combination: size small (4.0– 4.6 mm ); gena wider than eye; labrum flat, dorsal keel absent; mandible without preapical tooth; pronotal ridge sharply angled, dorsolateral angle acute to orthogonal; scopa absent; and metapostnotum smooth without evident rugae. Male L . lionotum can be recognised by the following diagnostic combination: size small ( 4.2–4.5 mm ; head width 1.15–1.22 mm ); lower paraocular area with sparse tomentum; antennal sockets very widely separated (IAD/OAD> 2.0); pronotal collar strong; mesepisternum imbricate, obscurely punctate; and vein 1rs-m sometimes incomplete or absent. They are most similar to the male of L . cephalotes , which is much larger in size (head width 1.54 mm ). Range. Ontario south to Alabama, west to Colorado. USA : AL, CO, DC, KS, MD, MO, NJ, NY, SC, VA, WV. CANADA : ON. DNA Barcode. Available. Multiple sequences. Comments. Uncommon. Lasioglossum lionotum is a social parasite of L . imitatum ( Wcislo 1997; as Paralictus asteris ). The holotype of L . lionotum was recently found in the research collection of George Eickwort at Cornell University. The head is missing but the specimen clearly matches the species commonly known as L . asteris . The original description includes few details about the head but does draw attention to the unusually short eyes which is consistent with L . asteris .