Lasioglossum (Dialictus) grinnelli

Lasioglossum (Dialictus) grinnelli (Cockerell, 1916) [Holotype: USNM; ♀ South Island, Coronado Islands, Baja California, August 21, 1915] Lasioglossum (Dialictus) daggetti (Cockerell, 1916): [Holotype: USNM (23329); ♂ South Island, Coronado Islands, L. California, August 21, 1915 (T. and W. Cockerell)] New synonymy This species was described based on five females collected on South Island, Coronado Islands off the Pacific Coast of the BCP in 1915, along with L. daggetti, which was described from three males collected in the same event (Cockerell 1916). Both L. grinnelli and L. daggetti are frequently collected together and share several distinct morphological characters, most obviously the punctation of the metasomal terga, which fill the depressed apical rims completely. The only morphologically similar species that occurs sympatrically (an undescribed species) is easily distinguished by having only two submarginal cells in the forewing. DNA barcodes for L. grinnelli and L. daggetti are also very similar with a maximum intraspecific divergence of 0.72% (BOLD process IDs: DLII1377- 08, DLII1399-08, DLII1434-08, DLII1459-08, DLII1675-09, NCBEE462-21). Based on these morphological, genetic, and occurrence data, we synonymize L. daggetti under L. grinnelli. As both were described in the same publication with specimens collected during the same event, we choose to retain Lasioglossum grinnelli as the valid name according to Article 24.2 of the International Code of Zoological Nomenclature (International Commission of Zoological Nomenclature 1999). This species is abundant in southern California in the San Diego area. Within the BCP, it was collected from the South Island of the Coronado Islands by T. D. A. Cockerell in 1915. Hurd (1979) also reported L. grinnelli near the border with the USA. The BBPT collected 10 specimens in the Coastal Sage Matorral in June 2020 (2 ♀, 1 ♂), September 2020 (1 ♀), October 2020 (2 ♀), and May 2022 (4 ♀). Voucher specimens are in MABC. See fig. 175.