The other has pale patches on the head, a greenish thorax, and a black abdomen with narrow green rings at the base of some segments.

[1] Ischnura erratica is native to the Pacific Northwest and is found in lowland and upland habitats in British Columbia, Washington, Oregon and northern California.

It breeds in a range of habitats including acid peat bogs, forest lakes, beaver dams, field ponds, ditches and the backwaters of cool streams.

In British Columbia, it is often associated with drooping woodreed (Cinna latifolia) in the submerged stems of which the eggs are laid.

It is on the wing in British Columbia from the very end of April until June or even later, and in California from February to September.