Lasioglossum (Dialictus) exiguum (Smith, 1879)

Figs 22A, 23A, 24A, 34A

Halictus exiguus Smith, 1879: 37 (holotype, ♀, NHMUK 010265368).

Dialictus exiguus – Moure & Hurd 1987: 100 (catalogue).

Type material

Holotype MEXICO – ♀; on/around Orizaba volcano; [19° N, 97.3° W]; “8.M.1856”; M. Salle leg.; NHMUK 010265368.

Other material examined

MEXICO – Quintana Roo • 1 ♀; 12 km NW of Reforma; [18.89° N, 88.65° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC SM0753053 • 2 ♂♂; same collection data as for preceding; 14 Oct. 1986; Charles D. Michener leg.; SEMC SM0730146, SM0753052 • 1 ♀; Reforma; [18.81° N, 88.57° W]; 14 Oct. 1986; Charles D. Michener leg.; SEMC .

Remarks

Uncommon on the Yucatán Peninsula (four specimens examined in the region); more common in Veracruz. The very large head and rectangular, strongly toothed clypeus apical margin are unmistakable diagnostic characters for this species. We consider the identifications highly reliable despite the distance between Orizaba and Quintana Roo.