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 ) illinoense (Robertson) Halictus illinoensis Robertson, 1892 : 271 . Ƥ. Lectotype . Ƥ USA , Illinois, Macoupin Co., Carlinville, 12.viii.1891 , (C. Robertson); [INHS: 11933] by W. E. LaBerge (in Webb 1980 ). Examined. Halictus illinoisensis Smith, 1910 : 688 . (Emend.) Taxonomy. Robertson, 1902b : Chloralictus Illinoensis , p. 249 (key); Michener, 1951 : Lasioglossum ( Chloralictus ) illinoense , p. 1114 (catalogue); Mitchell, 1960 : Dialictus illinoensis Ƥ3, p. 399 (redescription, key); Krombein, 1967 : Lasioglossum ( Dialictus ) illinoense , p. 464 (catalogue); Hurd, 1979 : Dialictus illinoensis , p. 1966 (catalogue); Moure & Hurd, 1987 : Dialictus illinoensis , p. 105 (catalogue); Gibbs, 2010b : Lasioglossum ( Dialictus ) illinoense Ƥ3, p. 149 (redescription, key). Diagnosis. Female L . illinoense can be distinguished from all other North American Dialictus by protrochanter conically produced ( Fig. 8 A). They are further recognisable by the combination of head wide (length/width ratio = 0.90– 0.92); clypeus with wide distal margin; propodeum with very strong carina delimiting lower margin of dorsolateral slope; and mesoscutal punctures fine, sparse between parapsidal lines, denser laterad of parapsidal line. Male L . illinoense can be recognised by the following diagnostic combination: clypeus with distal margin yellow; head wide (length/width ratio = 0.94–0.95); mesoscutum with posterior half polished due to lack of microsculpture, punctures fine, sparse between parapsidal lines (i=1–3d); mesepisternum rugulose; metasomal terga with apical halves impunctate except along premarginal line; and metasomal sterna with relatively sparse plumose hairs. Range. Nova Scotia , south to Georgia , Mississippi, west to Kansas. USA : GA, IL , IN, KS, KY, MD, MI, NC, NJ, NY, PA, SC, TN, TX, VA, WI, WV. DNA Barcode. Available. Multiple sequences. Comments. Common. See Gibbs (2010b) .