Amphimallon solstitiale (Linnaeus, 1758)

Female
Locally common across southern England and Wales, more abundant in coastal areas. Quoted variously as occurring from May to August, around Watford generally from mid June and found for about six weeks. Adults are crepuscular, sometimes flying before sunrise as well, and are a common sight throughout Watford. They swarm around the tops of trees, usually between 10 and 15 metres high, or around buildings in the town centre. They are a common sight during the day, sometimes active in bright sun on pathways or in alleys around the town and often resting on walls around shops, perhaps attracted to the lights the previous evening. They occasionally fly into well lit rooms and have been found on many occasions active on pathways in Cassiobury park after midnight. The larvae are subterranean, feeding on roots.

15-20mm. Distinctive, the only common species this is likely to be confused with is Melolontha melolontha (L.). Completely olive brown in life, fading a little darker when preserved dry. Head and pronotum densely punctate and pubescent. Elytra sparsely pubescent, the hairs as long as those on the pronotum Antennal club 3 segmented (cf.Melolontha), around 1mm in female, 2mm in male. Apical spurs of hind tibiae close together (cf.Serica), foretibiae with dark ridge on outer side, strongly toothed (fossorial) in female. Claws strongly toothed at base.
The behaviour of British Amphimallon species is described in detail by Lamb, 1917 Ent Mon Mag 53:210-12.

In our other species, the rare A. ochraceus (Knoch), the sparse elytral pubescence is much shorter than that on pronotum.

Description from 4 Watford specimens at X10


Female

Male

Female

Male

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