Lasioglossum (Dialictus) admirandum (Sandhouse)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 39-40

Lasioglossum (Dialictus) admirandum (Sandhouse)

Halictus (Chloralictus) admirandus Sandhouse, 1924: 14 . Ƥ.

Holotype. Ƥ USA, Woods Hole, Massachusetts (E. Cattell), [ NMNH: 26405]. Examined. Dialictus perspicuus Knerer and Atwood, 1966a: 883 . Ƥ 3.

Holotype. Ƥ CANADA, Ontario, Iona, Elgin Co., 15.ix.1963 on Solidago, (G. Knerer) ; [ ROM: 83647]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) admirandum p. 1111 (catalogue); Mitchell, 1960: Dialictus admirandus Ƥ, p. 377 (redescription); Krombein, 1967: Lasioglossum (Dialictus) admirandum , p. 462 (catalogue); Hurd, 1979: Dialictus admirandus , p. 1963, D. perspicuus , p. 1970 (catalogue); Moure & Hurd, 1987: Dialictus admirandus , p.

88, D. perspicuus , p. 121 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) admirandum Ƥ3, p. 52 (redescription, key, synonymy).

Diagnosis. Female L. admirandum can be recognised by the following diagnostic combination: head moderately elongate (length/width ratio = 0.95–1.01); clypeus with apicolateral margins convergent ( Fig. 21 A); mesoscutum densely tessellate, punctures sparse between parapsidal lines (i=1–3d); tegula pale translucent brownish yellow; mesepisternum weakly rugulose; metapostnotal rugae not reaching posterior margin; T1 acarinarial fan with dorsal opening; T1 anterior declivitous portion polished due to lack of microsculpture; metasomal terga brown, distinctly punctate throughout; and T3–T4 with abundant tomentum. They are most similar to L. paradmirandum and L. sagax . Female L. paradmirandum have mesepisternum tessellate and T1 declivitous portion distinctly coriarious. Female L. sagax have apical half of T2 nearly impunctate.

Male L. admirandum are similar to females except with head elongate (length/width ratio = 1.01–1.04); clypeus with yellow distal band; face with abundant tomentum obscuring surface below; flagellomeres elongate (length/width ratio = 1.57–1.82), yellow ventrally; tibial apices and bases with extensive yellow; and apical impressed areas of metasomal terga impunctate. They are most similar to L. sagax , which has mesoscutum relatively polished due to weak microsculpture.

Range. Ontario south to Georgia, west to Saskatchewan, Minnesota. USA: CT, IN, MA, MD, MI, MN, NY, WI. CANADA: ON, SK.

DNA Barcode. Available. Multiple sequences.

Comments. Uncommon. Gibbs (2010b) reported a smaller range for L. admirandum but additional material has since been identified from CUIC.

Most L. admirandum have the head and mesosoma primarily green but some individuals have stronger blue reflections. The holotype of H. admirandus belongs to the latter category whereas the holotype of D. perspicuus is a green form.

Figures

FIGURE 21. Margin of clypeus (A) L. admirandum, (B) L. mitchelli.