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

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

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) perpunctatum , p. 1116 (catalogue); Mitchell, 1960: Dialictus perpunctatus Ƥ3, 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 2010b: Lasioglossum (Dialictus) perpunctatum Ƥ3, 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 A); mesepisternum punctate; metapostnotal rugae reaching posterior margin; tegula ovoid with small posterior angle; metasomal terga brown, sometimes with obscure greenish reflections; T1 acarinarial fan large, dorsal opening absent; and T3–T4 with abundant tomentum. They are similar to L. miniatulum and L. sheffieldi . Female L. miniatulum have postgena lineolate and less dense tomentum on T3. 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=1–2d); 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).

Figures

FIGURE 13. Mesoscutal punctation (A) completely dense, (B) sparse medially (indicated by arrow). (From Gibbs 2010 b).