A25: Packer, L., R.E. Owen and C. Plateaux-Quénu. 1992. Electrophoretic evidence that Lasioglossum (Evylaeus) mediterraneum (Blüthgen) is a species distinct from L. (E.) laticeps (Schenck) (Hymenoptera, Halictidae), with notes on its phylogenetic position. Canadian Entomologist. 124:371-380.
Abstract: We show that Lasioglossum mediterraneum (Blüthgen) (Hymenoptera, Halictidae) is a species distinct from L. laticeps (Schenck) based upon electrophoretic analysis of 39 allozyme loci for sympatric populations collected from the Dordogne region of France. The genetic identity between the two is below average for sibling species of insects: no fewer than 10 fixed allelic differences were found. In contrast, allopatric L. laticeps populations (from the Dordogne and Paris) are genetically almost identical (I = 0.998). Heterozygosity estimates for both species are low, as is often the case with Hymenoptera. Diagnostic characteristics that can be used to separate the two species are described. A phylogeny for nine species of the subgenus Evylaeus is constructed from allozyme data.