Lasioglossum (Dialictus) anomalum (Robertson)

Halictus anomalus Robertson, 1892: 272 . Ƥ.

Lectotype. Ƥ USA, Illinois, Macoupin Co., Carlinville, 19.v.1891 (C. Robertson); [INHS: 11111] by W. E. LaBerge (in Webb 1980). Examined.

Taxonomy. Robertson, 1902a: Dialictus anomalus 3, p. 48 (description); Sandhouse, 1923: Dialictus anomalus, p. 193 (key); Michener, 1951: Lasioglossum (Dialictus) anomalum, p. 1119 (catalogue); Mitchell, 1960: Dialictus anomalus Ƥ3, p. 379 (redescription, key); Krombein, 1967: Lasioglossum (Dialictus) anomalum, p. 462 (catalogue); Hurd, 1979: Dialictus anomalus, p. 1964 (catalogue); Moure & Hurd, 1987: Dialictus anomalus, p. 89 (catalogue); Gibbs, 2010b: Lasioglossum (Dialictus) anomalum Ƥ3, p. 66 (redescription, key).

Diagnosis. Both sexes of L. anomalum can be recognised by the absence of vein 1rs-m resulting in two submarginal cells. Some individuals of L. lionotum also have two submarginal cells but are easily distinguished by their parasitic characteristics (see diagnosis for L. lionotum below). Lasioglossum anomalum are small, with mesoscutal punctures sparse between parapsidal lines, mesepisternal with contiguous punctures, T2 impunctate on apical half (except along premarginal line), and metasomal terga without tomentum. Male L. lionotum have the flagellomeres short (length/width ratio = 1.09–1.25), and gonostylus with elongate, medially directed hairs.

Range. Ontario west toColorado, south to Alabama. USA: AL, CO, CT, GA, IL, IN, IA, MA, MI, MN, MO, NC, NE, NY, VT, WI. CANADA: ON.

DNA Barcode. Available. Multiple sequences.

Comments. Common. Gibbs (2010b) reported a less southerly range for L. anomalum but additional material has since been identified from CUIC.

Lasioglossum anomalum is the type species for Dialictus .

Several individuals of L. anomalum with three submarginal cells in one or both wings have been examined (Gibbs 2010c), including one of the paratypes at INHS.