Seven new species of Lasioglossum (Dialictus) Robertson, 1902 (Hymenoptera: Halictidae: Halictini) from the Yucatán Peninsula, Mexico Author Landaverde-González, Patricia CFEE1568-9AD9-4531-885D-EBF3F68ABB43 General Zoology, Institute for Biology, Martin-Luther University Halle-Wittenberg, Hoher Weg 8, 06120 Halle (Saale), Germany. patricia.landaverde@zoologie.uni-halle.de Author Gardner, Joel AA15FE6E-921A-46D6-BC67-88E067F283D9 Department of Entomology, University of Manitoba, 12 Dafoe Rd., Winnipeg, Manitoba, R 3 T 2 N 2, Canada. clickbeetle3364@gmail.com Author Moo-Valle, Humberto 35656D9E-491C-4C34-8CAD-069E4B9F0E9B Departamento de Apicultura Tropical, Campus Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Mérida, Mexico. moovalle@correo.uady.mx Author Quezada-Euán, José Javier G. BD9DBC7E-AD59-47BA-BA72-4A881A31E320 Departamento de Apicultura Tropical, Campus Ciencias Biológicas y Agropecuarias, Universidad Autónoma de Yucatán, Mérida, Mexico. javier.quezada@correo.uady.mx Author Ayala, Ricardo B1CFBA3B-C28B-40C5-B674-CBC8DB69418C Estación de Biología Chamela, Instituto de Biología, Universidad Nacional Autónoma de México (UNAM), Apartado Postal 21, San Patricio Jalisco, 48980, Mexico. rayala@ib.unam.mx Author Husemann, Martin D31A05CA-DCD8-4CFB-A9D0-E9F070EC4707 Centrum für Naturkunde, University of Hamburg, Martin-Luther-King-Platz 3, 20146 Hamburg, Germany. martin.husemann@uni-hamburg.de text European Journal of Taxonomy 2023 2023-03-22 862 1 1 65 http://dx.doi.org/10.5852/ejt.2023.862.2079 journal article 264116 10.5852/ejt.2023.862.2079 957e3c13-6dd3-4b13-9576-9f013a4990bc 2118-9773 7767855 5D38246E-B144-434C-A2FE-C303381B0CD7 Lasioglossum ( Dialictus ) tropicior ( Ellis, 1914 ) Fig. 24B Halictus ( Chloralictus ) tropicior Ellis, 1914: 219 ( holotype , ♀ , USNM ENT00535200). Dialictus tropicior – Moure & Hurd 1987: 135 (catalogue). Type material Holotype GUATEMALA – Izabal • 1 ♀ ; Quirigua ; [ 15.27° N , 89.04° W ]; 20 Feb. 1912 ; W.P. Cockerell leg.; ex Distimake quinquefolius ; USNM ENT00535200 . Other material examined MEXICO – Campeche • 1 ♀ ; Ruinas Edzna ; [ 19.597° N , 90.23° W ]; 24 Jun. 1966 ; University of Kansas Mexico Expedition leg.; SEMC . – Quintana Roo • 1 ♀ ; 12 km NW of Reforma ; [ 18.89° N , 88.65° W ]; 14 Oct. 1986 ; Charles D. Michener leg.; SEMC • 1 ♀ ; 23 km W of Felipe Carrillo Puerto ; [ 19.58° N , 88.27° W ]; 12 Oct. 1986 ; Charles D. Michener leg.; SEMC . Remarks Uncommon on the Yucatán Peninsula ( three specimens examined). The specimens closely match images of the holotype and agree with the original description ( Ellis 1914 ), and the type locality in eastern Guatemala is on the southern edge of the Yucatán Peninsula, but we still consider the identifications somewhat uncertain because of the likelihood that this species (along with L. deceptor , L. flaveriae (Mitchell, 1960) , L. gundlachii (Baker, 1906) , L. liguanense (Sandhouse, 1924) , and possibly L. exiguum and L. umbripenne (Ellis, 1913)) is part of a large and diverse complex including many undescribed species. Morphologically similar specimens which cannot be confidently assigned to a described species are common in other areas of Mexico .