DavidNotton's picture


Observed: 20th June 2009 By: DavidNotton
Natural History MuseumNatural History Museum
Invertebrates expert

Female wasp probing for suitable hosts in trap nest. I made the trap nest from a block of wood with holes drilled in and hung it ona fence in a sunny position. It soon attracted Osmia bees, crabronids and their associated nest parasitoid chrysidids, gasteruptiids, and sapygids

Species interactions

No interactions present.


anonymous spotter's picture

Great shot -

not sure about the species (though it would be my guess), but well taken.

DavidNotton's picture

Gasteruption jaculator

Roger, you're right to be sceptical because some of the Gasteruption are v. similar. Fortunately this photo is good enough to distinguish them! Of the 3 British species with a long ovipositor, pedemontanum has very obvious pits on the back of the head and broad, flared occipital carina and laticeps has a small pit on the back of the head (would be hard to see on this picture) but a distinctly flared and medially advanced occipital carina (which would be clear). The one in the picture has no obvious pits on the back of the head and a relatively narrow, evenly curved occipital carina, hence jaculator. Besides which pedemontanum is rare, laticeps v. rare and jaculator is v. common. If anyone has genuine British specimens of either of pedemontanum or laticeps especially I'd be grateful to have them to suppliment the small amount in the national collection. Best regards!