Anthrax anthrax

Anthrax anthrax, is a species of fly in the family Bombyliidae but unlike for example Bombylius major this species does not mimic a bee or bumblebee. The eggs are flicked by the adult female toward the entrance of the nests of mason bees. After hatching, the larvae find their way into the nests to feed on the bee larva. Anthrax anthrax can be found in May to August throughout mainland Europe, but probably does not occur in Britain.[1] In the Netherlands Anthrax anthrax is a common visitor of insect hotels.[2]

Anthrax anthrax
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Class:
Insecta
Order:
Diptera
Family:
Bombyliidae
Genus:
Anthrax
Species:
A. anthrax
Binomial name
Anthrax anthrax
Schrank 1781

Description

Anthrax anthrax is a fairly large fly, the body length is 10 mm. The body is black with four white markings at tergum 2 and 3 and two white markings at the end of the abdomen. Tergum 1 is black with tufts of white hairs at the side. These tufts are visible in this picture of a hovering fly.

Anthrax anthrax hovering, see the white tufts of hair at the sides of tergum 1

The wings are mostly black, only the top is transparent. The veins are dark brown. The following picture was overexposed. Due to the brightly lit background the veins are visible.

The veins are visible due to the bright background

The newly emerged Anthrax anthrax may be found sitting on a bee hotel. Their body is dull black with more transparent wings.

A recently emerged Anthrax anthrax

Behaviour

The females may be found hovering before an insect hotel shooting eggs into the nest entrances of mason bees.[3] An animation is given here.

Anthrax anthrax hovering near a nest entrance of a mason bee

Every now and then the females are rubbing the abdomen in a place with dust or sand. Dust or sand is necessary to make the eggs less tacky. To this end the females do have a sand chamber.[4] Anthrax anthrax is sometimes seen hovering above a flower, as given in this animation (7.5 times retarded)

Anthrax anthrax hovering above a flower collecting pollen

References
  1. Stubbs, A.; Drake, M. (2014). British Soldierflies and Their Allies: A Field Guide to the Larger British Brachycera. British Entomological & Natural History Society. pp. 528 pp.
  2. Breugel, P. van 2014. Gasten van bijenhotels. – EIS Kenniscentrum Insecten en andere ongewervelden & Naturalis Biodiversity Center, Leiden.
  3. Wijngaard W (2012) : Control of hovering flight during oviposition by two species of Bombyliidae. Proc. Neth. Ent. Soc. Meet. 23. pp 9-20.
  4. Yeates D.K. (1994) : The cladistics and classification of the Bombyliidae (Diptera : Asiloidea). Bull. Am. Mus. Nat. Hist. 219. AMNH, NewYork, NY, USA.
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