Eggs are known to be laid in elm flowers, but may also be laid on other elm parts. 

Nymphs hatch in May-June. They can have a red to brown abdomen and brown to black thorax and head. They look similar to boxelder bug and false cinch bug nymphs.

Adults show up around May-July. They are reddish-brown and black and 0.3 in (0.75 cm) long. The back has a black triangle inside two reddish-brown triangles. Wings are half black translucent membrane and half leathery red and black. Along the margin of the abdomen, there are white spots alternating with reddish-brown spots.

Elm seed bugs feed on elm seeds and leaves. They also invade structures, giving off a pungent, foul odor when crushed.

Selected Images

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References

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Common Name Reference: Derived from taxonomy / Generic common name

Scientific Name Reference: Zoological Museum Amsterdam/ University of Amsterdam