Begonia Flowers and a Sweat Bee

shiny, bright green tiny bee

Once a year when Pam’s gardens are at a summer peak I venture out to capture her work in early morning light. For this third image of the begonia series I used the same handheld Canon EOS 1Ds Mark III SLR but with the Canon lens EF 100 mm f 2.8L IS USM variable lens. Click me for the first post, “Begonia Grandis.”

Click photograph for a larger view.

Sweat Bee!!

The bee on the right, in sharp focus, was a puzzle to me. I am familiar with it, they are very common around here, and striking with a bright green shiny thorax. For this post I decided to identify it.

After thirty minutes of poking around I found a list of New York Wild bees on the Cornell CALS (College of Agriculture and Life Sciences) site. It is in the form of an excel spreadsheet and very helpful. There are over 400 species listed. Using the “filter” feature I found the six families and, for each, did a web search. I am 98% sure this bee is in the family Halictidae, known as “sweat bees,” being attracted to the salt of perspiration they use for nutrition.

Next I looked as the first name in the species designation within the family Halictidae. Tjhis is the genus. There were not many, in a few minutes singling out Agapostemon, known as the “metallic green sweat bee.” I did not find it necessary to hone in on the exact species as members of the genus Agapostemon have defining characteristics.

There are four species listed on the Cornell CALS spreadsheet, all are ground nesting and solitary. Sweat bees are useful as crop pollinators. In Texas they can replace honeybees for pollination of cotton.

Agapostemon sericeus
Agapostemon splendens
Agapostemon texanus
Agapostemon virescens

The lens is designed for macro work and is a fixed focus, it can capture small details without needed to be close to the subject. I decided to crop the image down to emphasize the bees. The sharper focus is on the sweat bee

Copyright 2019 Michael Stephen Wills All Rights Reserved