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Hawaii was colonized once by a single species of Masked Bee (Hylaeus), and evolved and split into dozens of species. Subsequent to Polynesian and European colonization a steady progression of non-native plants and bees have invaded.

Hawaii was colonized once by a single species of Masked Bee (Hylaeus), and evolved and split into dozens of species. Subsequent to Polynesian and European colonization a steady progression of non-native plants and bees have invaded.

Sara Prado found this Megachile concinna in agriculture fields in her Puerto Rico studies. Is it native to P.R.? Nope. It is a tramp species that shows up in different places from its homeland in the Mediteranean. Photo by Brooke Alexander.

Megachile concinna, Female, mandibles, Dominican Republic, 2012 March

Sara Prado found this Megachile concinna in agriculture fields in her Puerto Rico studies. Is it native to P.R.? Nope. It is a tramp species that shows up in different places from its homeland in the Mediteranean. Photo by Brooke Alexander.

Sara Prado found this Megachile concinna in agriculture fields in her Puerto Rico studies. Is it native to P.R.? Nope. It is a tramp species that shows up in different places from its homeland in the Mediteranean. Photo by Brooke Alexander.

Megachile concinna, Hispaniola, Dominican Republic, female

Here is a small leaf cutter from Puerto Rico. However, it is not native to P.R. but likely inadvertently introduced through its habit of nesting in holes in wood...which could be holes in pallets or packing crates. Found is scattered locations around North America and even in Hawaii.

Here is a small leaf cutter from Puerto Rico. However, it is not native to P.R. but likely inadvertently introduced through its habit of nesting in holes in wood...which could be holes in pallets or packing crates. Found is scattered locations around North America and even in Hawaii.

Here is a small leaf cutter from Puerto Rico. However, it is not native to P.R. but likely inadvertently introduced through its habit of nesting in holes in wood...which could be holes in pallets or packing crates. Found is scattered locations around North America and even in Hawaii.

A sweet little leaf cutter from Tucson Arizona, Megachile coquilletti is a hole nester and I imagine like its sister taxi in the East probably is happy to nest in people's yards and benefits from rich plantings of desert and dry country native plants. Collected by Tim McMahon and picturated by Elizabeth Garcia.

This is Megachile coquilletti, a small bee from Yolo County in California. "This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas. Claire Kremen's 10-year study of hedgerows shows the benefits of planting native shrubs and forbs in agricultural areas for native bees.

A sweet little leaf cutter from Tucson Arizona, Megachile coquilletti is a hole nester and I imagine like its sister taxi in the East probably is happy to nest in people's yards and benefits from rich plantings of desert and dry country native plants. Collected by Tim McMahon and picturated by Elizabeth Garcia.

A sweet little leaf cutter from Tucson Arizona, Megachile coquilletti is a hole nester and I imagine like its sister taxi in the East probably is happy to nest in people's yards and benefits from rich plantings of desert and dry country native plants. Collected by Tim McMahon and picturated by Elizabeth Garcia.

This is Megachile coquilletti, a small bee from Yolo County in California. "This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas. Claire Kremen's 10-year study of hedgerows shows the benefits of planting native shrubs and forbs in agricultural areas for native bees.

This is Megachile coquilletti, a small bee from Yolo County in California. "This bee was collected in the California Central Valley in Yolo County for research on small-scale restoration in agricultural areas. Claire Kremen's 10-year study of hedgerows shows the benefits of planting native shrubs and forbs in agricultural areas for native bees.

Megachile deceptrix, Female, face, Dominican Republic, March 2012

Megachile deceptrix, Female, Dominican Republic, March, 2012

Megachile deceptrix, Female, Dominican Republic, March 2012,

Megachile deceptrix, Dominican Republic,

Megachile deceptrix, male, Dominican Republic, Hispaniola