Lasioglossum (Dialictus) tegulare (Robertson) Halictus tegularis Robertson, 1890: 318. Ƥ 3. Holotype. Ƥ USA, Connecticut, N. Haven, 6 June 1878, (W.H. Patton); [ANSP: 4254] designated herein. Examined. Taxonomy. Robertson, 1902b: Chloralictus tegularis, p. 248 (key); Viereck, 1916: Halictus (Chloralictus) tegularis, p. 706 (key); Michener, 1951: Lasioglossum (Chloralictus) tegulare, p. 1118 (catalogue) Mitchell, 1960: Dialictus tegularis Ƥ3, p. 423 (redescription, synonymy); Krombein, 1967: Lasioglossum (Dialictus) tegulare, p. 466 (catalogue); Dialictus tegularis, p. 1972 (catalogue); Moure & Hurd, 1987: Dialictus tegularis, p. 134 (catalogue); Gibbs, 2009a: Lasioglossum (Dialictus) tegulare Ƥ3, p. 13 (redescription, tax. status); Gibbs, 2010b: Lasioglossum (Dialictus) tegulare Ƥ3, p. 323 (redescription, key). Diagnosis. Female L. tegulare can be recognised by the following diagnostic combination: tegula enlarged, strongly punctate with distinct posterior angle (Fig. 7 A); head relatively wide (length/width ratio = 0.94–0.97); head and mesosoma greenish; mesepisternum with strong microsculpture between punctures; and inner metatibial spur with 3–4 branches (excluding apex of rachis). Male L. tegulare also have an enlarged tegula and can be distinguished from similar species by dense punctures on T2 immediately basal of premarginal line (Fig. 38 A) and sparse facial tomentum, except on lower paraocular area. They are most similar to L. ellisiae and L. puteulanum. Male L. ellisiae have sparse punctures on T2 immediately basal of premarginal line (Fig. 38 B). Male L. puteulanum have more tomentum distributed outside of lower paraocular area. Range. Ontario south to Georgia. USA: CT, DC, GA, KY, MA, MD, MO, NC, NE, NJ, NY, RI, SC, TN, VA, VT, WV. CANADA: ON. DNA Barcode. Available. Multiple sequences. Comments. Common. The taxonomic limits of this species were recently revised (Gibbs 2009a). The specimen indicated above is herein designated as the lectotype to ensure stability of the name.

Published as part of Gibbs, Jason, 2011, Revision of the metallic Lasioglossum (Dialictus) of eastern North America (Hymenoptera: Halictidae: Halictini), pp. 1-216 in Zootaxa 3073 on pages 195-196, DOI: 10.5281/zenodo.1049595