Odynerus spinipes

Odynerus spinipes is found in northwestern Europe and Scandinavia as far north as central Sweden and south to the Alps and southern France, there is also a record from Kazakhstan.[2] in Great Britain it is found as far north as southern Scotland but there are very few records from Ireland.[3] It is now thought to be extirpated from in Scotland.[4]

Odynerus spinipes prefers open habitats and scrub, in Essex it has been mostly found in post industrial sites.[5]

Odynerus spinipes adults mate soon after emergence and mating is followed by a search for nest sites which are then prepared and the cells provisioned with prey by the females. The prey is weevil larvae of the genus Hyperba (family Curculionidae). The nests are constructed where there are vertical banks of hard earth, usually of clay but sometimes sand is used. The location of the nest is first dampened with water before a group of five to six cells is created immediately behind the vertical face of the bank. A "chimney" up to 30 mm long which curves over and downwards is made from the spoil created by the excavation. It is not known what the function of the chimney is but one theory is that it may shelter the burrow from rain in the exposed situations the wasp chooses for nesting or the chimney may deter potential kleptoparasites and parasitoids. As suitable nesting sites are scarce several females may be found nesting close together in small aggregations.[3]

The female wasp hunts for weevil larvae which are immobilised by stinging and by chewing. The immobilised prey is transported in the mandibles held against the underside of the body with the forelimbs. As many as 30 beetle larvae have been recorded in a single cell. The egg is laid before the prey is collected and is suspended from the side of the cell by a fine filament. The egg hatches a few days after it is laid. The collected beetle larvae are consumed by the wasp's larva in a matter of weeks; the wasp then probably overwinters as a prepupa.[3]

The adults' flight period in Great Britain is between May and August but they are most common in June, the adults nectar at flowers with short coronas and accessible nectaries and they will also feed on the honeydew secretions of aphids and from extra floral nectaries.[3]