Bembix rostrata
"Bembix rostrata" ranges in distribution from Europe and the Mediterranean to Central Asia, and as far north as Denmark and Sweden. "Bembix rostrata" displays distinctive behaviour in front of its nest, digging its burrows with fast, synchronised movements of its forelegs. In addition, the insect can turn very rapidly about its own axis, the flapping of its wings as it does this producing a buzzing sound reminiscent of a gyroscope. Its size (), striking yellow and black-striped abdomen and the labrum, extended into a narrow beak, are distinctive features. "Bembix rostrata" goes through 4 general life stages: egg, larva, pupa, and adult. Adult females burrow nests into the sand and lay their eggs there. Once the eggs hatch, they new larvae continue their development in nests the nests that they were born in. Each individual grub develops in its own burrow, this reduces competition for development space and necessary nutrients. Adult B. "rostrata" gather prey and bring the food back for the developing grubs to feed on. The B. rostrata goes through 4 general life stages: egg, larva, pupa, and adult. When young reach pupal stage, females dig another nest to lay more eggs. "Bembix rostrata" forms colonies between a dozen and several hundred insects, where the females each construct a tube up to long containing a single brood cell. This is stocked with dozens of insects, predominantly large flies (Tabanidae, Syrphidae), which provide the larva with food for its two-week development to the imago stage. The female carefully re-seals the nest tube after each feeding. Because of this intensive maternal care, a female can raise at most only eight larvae during the high summer. "B. rostata" is very faithful to its nest sites, often nesting in the same places year-on-year, even if these change over time and alternative habitats are available. The species has become rare due to loss of large open-sand surfaces in warm areas, such as in the sand dunes of the upper Rhine Graben. It is also the host for several parasitoids in families such as Bombyliidae, Conopidae, and Mutillidae. A cuckoo wasp which specialises in "B. rostrata" is "Parnopes grandior". The behaviour of "B. rostrata" led the famous naturalist Jean-Henri Fabre to conduct intensive studies of the species.
Distribution
Bembix rostrata is a species of sand wasp native to Central Europe.