Lasioglossum (Dialictus) pictum (Crawford)

Halictus pictus Crawford, 1902a: 236 . Ƥ.

Syntypes. 2Ƥ USA, Nebraska, Crawford, Sioux Co., 29.vii.1901 on Mentzelia, (M.A. Carriker); [UNSM]. Examined. Halictus graenicheri Ellis, 1914b: 221 . Ƥ.

Holotype. 1Ƥ USA, Wisconsin, Genoa, Vernon Co., Wisconsin, 13–19.vii.1911 [NMNH: 27761]. Examined. Dialictus muskegonensis Mitchell, 1960: 439 . 3.

Holotype. 3 USA, Michigan, Muskegon Co., 2.viii.1944, (R.R. Dreisbach); [NCSU]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) graenicheri, p. 1113, L. (C.) pictum, p. 1116 (catalogue); Krombein, 1958: Lasioglossum (Chloralictus) graenicheri, p. 230, (catalogue); Mitchell, 1960: Dialictus pictus Ƥ, p. 412 (redescription, synonymy); Mitchell, 1962: Dialictus pictus, p. 547 (synonymy); Krombein, 1967: Lasioglossum (Dialictus) pictum, p. 465 (catalogue); Hurd, 1979: Dialictus pictus, p. 1970 (catalogue); Moure & Hurd, 1987: Dialictus pictus, p. 122 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) pictum Ƥ3, p. 249 (redescription, key).

Diagnosis. Female L. pictum can be recognised by the following diagnostic combination clypeus black-brown distally; postgena polished; lower paraocular area with moderately sparse tomentum; mesoscutum not obscured by tomentum; mesepisternum reticulate-punctate; legs mostly brown; and metasoma orange-yellow metasoma, apical impressed areas obscurely punctate. They are most similar to L. arantium, which has a reddish orange metasoma and a completely lineolate postgena.

Male L. pictum can be recognised by head moderately elongate (length/width ratio = 0.98–1.02); face with moderately dense tomentum; flagellomeres short, orange-yellow ventrally; mesoscutal punctures moderately sparse (i=1–2d); parapsidal line narrow; mesepisternum distinctly punctate; and metasomal terga reddish brown, apical margins orangeyellow. They are similar to L. foveolatum, which has a very deep and wide parapsidal lines (Fig. 15 B) and brown metasomal terga.

Range. Ontario west to Alberta and Nebraska. USA: IN, MI, MN, NE, WI. CANADA: AB, MB, ON, SK.

DNA Barcode. Available. Multiple sequences.

Comments. Uncommon east of the Mississippi.