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Leaf cutter bees (genus  Megachile ) are a diverse group of pollinators of wild and cultivated plants. Many species nest in pre-existing cavities and use diverse building materials to construct their brood cells. For instance, species of subgenus  Chrysosarus  add a mud layer between two layers of leaves or petals. We studied similarities and differences in their nesting biology from 13 nests of  Megachile  ( Chrysosarus )  concava  and 72 nests of  Megachile  ( C .)  diversa  (Megachilidae) obtained in trap nests in northern Argentina. Females of  M .  concava  used trap nests with higher diameters, shorter length, and built a lower number of brood cells per nest compared to females of  M .  diversa . In the latter species, the sex ratio was female-biased, but we observed male-biased progeny in shorter trap nests, thus the sex ratio of  M .  diversa  could be context-dependent. Reproductive success was different between species: 40.5% for  M. concava  and 75.8% for  M .  diversa,  desiccation and/or mold being the principal factor of mortality of immature stages. The attack from parasitic species represented 10.8% for  M. concava  and only 1.2% for  M .  diversa. Megachile concava , based on observations of a few nests collected during autumn, could be a bivoltine species and oligolectic of Faboideae, while  M. diversa  is a partially bivoltine or multivoltine, and polylectic species, with a marked turnover of pollen resource throughout its extensive reproductive season. Differences in the trophic niche and, to a lesser extent, in the inner diameter of trap nests used could allow their coexistence in the studied forests.

Nesting biology of two sympatric species of Megachile ( Chrysosarus ) (Megachilidae) in Argentina