Sweat Bees

I was taking a picture of the flower. THe bee landed as the shutter snapped.

On Opuntia phaeacantha in UC-Davis Arboretum

Figures 1–6.Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 1–2 lateral habitus 3–4 head in frontal view 5 clypeus in lateral view 6 teeth of mandible. 1, 3, 6 female; 2, 4, 5 male.

Figures 7–12.Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 7–8 labrum 9 lateral surface of pronotum 10 mesoscutum 11 mesepisternum 12 metapostnotum. 7, 9–12 female; 8 male.

Figures 13–18.Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 13–14 1st to 3rd metasomal terga 15 2nd metasomal sterna in lateral view (arrow indicate) 16 setae on metasomal sterna 17 female on the flower of Angelica anomala 18 collecting site at Mt. Gariwangsan, South Korea. 13, 17 female; 14–16 male.

Figures 19–25.Lasioglossum (Acanthalictus) dybowskii (Radoszkowski). 19 inner hind tibial spur 20 6th metasomal sternum 21 7–8th metasomal sterna 22 genitalia in ventral view 23 genitalia in dorsal view 24 genitalia in lateral view 25 ventral retrorse lobe of genitalia, 19 female; 20–25 male. Scale bars: 19, 25 = 0.25 mm; 20–24 = 0.5 mm.

The entrance to an M. genalis nest in the field, showing the constructed nest collar (~5mm across)

2 pupal cells opened to show how cells are constructed from chewed wood and lined with a waxy coating from the Dufour's gland

Two nests with the side removed to show cell architecture. Some cells are open and intact, and others have the near side removed

A nest in cross section showing (L to R) a pupa, egg on pollen mass, pupa, and larva. The pellets below the larva are feces.

A pupa in her cell which has been opened. Closed cells are visible on either side of the opened cell.

A bee in her nest nest, which has been opened to expose the tunnel

A nest stick that has been opened to expose the brood cells inside