[4] Brunneria borealis is an elongated green insect with the typical raptorial forelimbs of a mantis.

At Austin, Texas it was found on flowerheads of the slender aster (Symphyotrichum subulatum.

[6] At Cedar Creek, Texas it was found in meadows of little bluestem grass (Schizachyrium scoparium) at night but was unnoticeable by day.

[5] This mantis does not breed sexually and the adults, which are all female, lay their eggs without the involvement of a male.

[5] This species also enjoys eating grass dwelling phasmatodea, which are often slender instead of robust and have few defenses against the mantises.