Lasioglossum (Dialictus) perpunctatum (Ellis)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 156-157

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Lasioglossum (Dialictus) perpunctatum (Ellis)


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 , 1955, (H.V. Weems, Jr.), [ FSCA]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) perpunctatum , p. 1116 (catalogue); Mitchell, 1960: Dialictus perpunctatus Ƥ 3, 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 2010 b: Lasioglossum (Dialictus) perpunctatum Ƥ 3, 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 View FIGURE 13 A); mesepisternum punctate; metapostnotal rugae reaching posterior margin; tegula ovoid with small posterior angle; metasomal terga brown, sometimes with obscure greenish reflections; T 1 acarinarial fan large, dorsal opening absent; and T 3 –T 4 with abundant tomentum. They are similar to L. miniatulum and L. sheffieldi . Female L. miniatulum have postgena lineolate and less dense tomentum on T 3. 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= 1–2 d); 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).


California Academy of Sciences


Smithsonian Institution, National Museum of Natural History


North Carolina State University Insect Museum


Florida State Collection of Arthropods, The Museum of Entomology


Department of Natural Resources, Environment, The Arts and Sport














Lasioglossum (Dialictus) perpunctatum (Ellis)

Gibbs, Jason 2011

Halictus perpunctatus

Ellis 1913: 210