Philoctetes truncatus (Dahlbom,1831)

Description and notes

Previously known as Omalus truncatus. Identification keys and general biology are given in Spooner (1954), Morgan (1984), Falk (1991) and Kunz (1994).

Distribution

Very rare, with only five records traced, all from southern England: Dorset (nineteenth century), Berkshire (1901), Essex (1906), Surrey (1910), Herefordshire (1983).

Overseas, the wasp occurs in Norway, Sweden, Denmark, The Netherlands, Belgium, France, Spain, Germany, Italy, Poland, Hungary), western Asia and north Africa.

Status in Britain and Ireland

This species is listed in both Shirt (1987) and Falk (1991) as Endangered, RDB1.

Identification

Photo: (C) Josef Dvorak www.biolib.cz for BWARS Click to enlarge

See Morgan (1984) for identification.
The posterior of the third gastral tergite is vertically truncated above the central notch (bottom right and lateral view in the montage).
The head, thorax, and anterior gaster are violet; posterior gaster is blue green with viloet.
 

Habitat

Probably associated with habitats containing dead wood and hollow stems in sunny warm situations.

Flight period

The few records available are from June and July.

Flowers visited

No British information found; overseas, swept from Apiaceae.

Parasites

No specific information found.

Parasitic biology

Unknown, but associated overseas with the genus Diodontus (Kunz, 1994

Author of profile

M E Archer.