Nesting biology of the nomiine bee, Nomia (Acunomia) chalybeata Smith, was studied in Iriomote Island, Japan (N2415–250) in 2003 and 2004. Its nesting period extended for 6 months from around the end of April to October. The nest aggregation was found in clay soil under shady conditions. Twenty nests/m2 were present at the highest density spot. Brood numbers in solitary nests were 5–20 (me…