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52 Osmia inermis, female, ventral view of mandible showing tooth on inner margin of ventral surface 53 Osmia nigriventris, male, T5 and T6, showing flange on lateral margins 54 Osmia laticeps, female, clypeus with most of covering hairs removed 55 Osmia maritima, female, clypeus 56 Osmia inermis, female, posterior surface of propodeum and propodeal triangle 57 Osmia maritima, female, posterior surface of propodeum and propodeal triangle.
