Serica brunnea (Linnaeus, 1758)

Locally common across England, Wales and southern Scotland, More especially in sandy and chalky areas. Concealed at the base of grass tussocks, in moss or decaying tree stumps during the day, flies readily in the evening, usually above long grass where sweeping may produce many specimens. Occasionally the adults are found swarming, here many males and females are in full flight while many more sit at the top of grass stems. On the occasion we saw this, in Cassiobury Park, the swarm covered an area of long grass about 5m by 100m, mostly under high Aesculus foliage and only a few metres from a well used public pathway. The swarm began at dusk and went on for at least two hours, all the while individuals could be seen by torchlight leaving and heading off in all directions. Not a single specimen was present at daybreak the following morning. Comes readily to light, sometimes indoors and often at M.V. light on vertical sheets, especially near woodland. The larvae feed on the roots of grasses and young shrubs.

8-10mm. Entirely brown, head between eyes darker. Head, thorax and elytra punctate, fine setae visible along side of thorax and elytra, same size as those on first antennal segment. Antennal club dimorphic, much longer in male. Apical spurs on posterior tibae widely separated, inserted either side of first tarsomere. All claws lobed.

Description from 4 Watford specimens at X10