Lasioglossum (Dialictus) subviridatum (Cockerell)

Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), Zootaxa 3073, pp. 1-216 : 184-185

publication ID 10.5281/zenodo.1049595

publication LSID


persistent identifier

treatment provided by


scientific name

Lasioglossum (Dialictus) subviridatum (Cockerell)


Lasioglossum (Dialictus) subviridatum (Cockerell)

Halictus (Chloralictus) subviridatus Cockerell, 1938 a: 2 . Ƥ 3.

Holotype. Ƥ CANADA, Saskatchewan, Lake Ajawaan, 26.viii. 1936, (Cockerell); [ AMNH]. Examined.

Taxonomy. Michener, 1951: Lasioglossum (Chloralictus) subviridatum , p. 1118 (catalogue); Dialictus subviridatus , p. 1972 (catalogue); Moure & Hurd, 1987: Dialictus subviridatus , p. 132 (catalogue); Gibbs, 2010 b: Lasioglossum (Dialictus) subviridatum Ƥ 3, p. 313 (redescription, key).

Diagnosis. Female L. subviridatum can be recognised by the following diagnostic combination: head wide (length/ width ratio = 0.93–0.96); mesoscutum polished due to weak microsculpture, punctures moderately sparse between parapsidal lines (i= 1–2.5 d); tegula brownish yellow; mesepisternum weakly rugulose, relatively shiny; metapostnotum strongly rugoso-carinulate; T 1 polished due to lack of microsculpture; T 1 acarinarial fan small with very wide dorsal opening; metasomal terga brown, apical halves sparsely punctate; and T 2 –T 3 basolaterally and T 4 entirely with very sparse tomentum and weak apical fringes. They are most similar to L. abanci , which has very sparse basomedial punctation on T 2. They are also similar to L. planatum and L. oblongum , both of which have the mesoscutum and mesepisternum dull due to microsculpture.

Male L. subviridatum can be recognised by the following combination: head moderately long (length/width ratio = 1.02); facial tomentum limited to lower paraocular area; flagellomeres long (length/width ratio = 1.80–1.93), bright orange-yellow ventrally; mesoscutum imbricate, punctures sparse between parapsidal lines (i= 1–2.5 d); mesepisternum rugulose; metapostnotum with coarse rugae reaching posterior margin; propodeum dorsolateral slope rugose; metasomal terga polished, apical halves impunctate (except along premarginal line); and S 3 –S 5 with sparse apicolateral patches of plumose hairs ( Fig. 32 View FIGURE 32. S 3 B). They are most similar to L. laevissimum , L. oblongum and L. ephialtum . Male L. laevissimum have denser hairs on metasomal sterna, particularly on S 3 ( Fig. 32 View FIGURE 32. S 3 A). Male L. oblongum have very coarse rugae on metapostnotum separated by smooth, shining areas distinctly wider than rugae. Male L. ephialtum have sparse basolateral tomentum on metasomal terga.

Range. Saskatchewan east to Ontario, New Hampshire, south to Virginia. USA: CT, IL, IN, MA, MD, NH, NJ, NY, WI, WV, VA. CANADA: ON, SK.

DNA Barcode. Available. Multiple sequences.

Comments. Common. Until recently this species was only known from the type locality (see Wolf & Ascher 2009; Gibbs 2010 b). Additional sampling in areas near the type locality are needed to test the limits of the species and to ensure eastern USA material is conspecific. DNA barcodes suggest that there may be a second, closely related species but morphological study has not yet been able to find corroborating characters.

Specimens of L. subviridatum at CUIC were collected from nests in logs.


American Museum of Natural History


Department of Natural Resources, Environment, The Arts and Sport


Cornell University Insect Collection














Lasioglossum (Dialictus) subviridatum (Cockerell)

Gibbs, Jason 2011

Halictus (Chloralictus) subviridatus

Cockerell 1938: 2