They have large eyes that face toward the sides, and the top of the head is typically concave between the eyes. It injects a fluid into its victims that breaks down the muscle tissue. Literature: Borror et al. Larvae are. Like all true flies, robber flies have only 2 wings. Larvae hatch and fall to the ground, where they burrow under the soil, eat grubs and other small invertebrates, and overwinter. Two species of robber flies: The right fly is called the bumble bee robber fly. Robber flies are highly variable in size and body shape, ranging from 0.5 to 5.0 cm (0.2 to 2.0 in) in length. Click for a hub of Extension resources related to the current COVID-19 situation. They do so apparently irrespective of any repugnatorial chemicals the prey may have at its disposal. A robber fly, (Diptera: Asilidae). What type of front wings do the Orthoptera possess? For that reason, Robber Flies are efficient predators, and they have a big appetite for bugs. They have long, strong legs for grabbing prey. Latreille was the authority for establishing the family in 1802. In general the biology of the Asilidae is still poorly known. Other bristles are present on the metanotum (dorsocentral bristles on the ventral episternum and at the apex of the mesoscutellum. Species vary in appearance and some mimic wasps and bees. Adult stages are medium to large (3/8 to 1-1/8 inch) flies often observed on stems of plants, on the... Life Cycle: . Others attribute to them "still-hunting", that is, perching and attacking in mid-air; My National Audubon Society Field Guide to Insects asserts they "pounce on resting insects from above." A few species of the genus Promachus are serious pests of apiaries because they feed on bees. The legs are relatively long and strong, with many macrochaetes performing a raptatorial function. The venation is much as in Rhagionidae, Tabanidae and Therevidae; the radial R is always four-branched, with R2+3 unbranched. Latreille was the authority for establishing the family in 1802. Flies are prevalent in virtually all habitats, with over 16,000 species in North America. He also described many species in Systematische Beschreibung der bekannten europäischen zweiflügeligen Insekten (1800 to 1838). The pupa is naked, as in the majority of Orthorrhapha, exarate and therefore able to move. The common name for members of the family is the robber flies. They live in soil, rotting stumps and logs, and similar moist organic material. As with other robber flies, this species can inflict a painful bite if mishandled. However, the highest levels of biodiversity are in warm climates; tropical or subtropical and arid or semi-arid regions tend to have the greatest variety of species, followed by areas where rainfall is highly seasonal. They consist of a strongly sclerotized proboscis which includes the labium and maxillae which form a food canal, the labrum and a piercing organ, the hypopharynx. The occipital region has one or more rows of bristles aligned behind the posterior margin of the eye. Puncture is followed by the injection of saliva, whose active components perform two functions: the neurotoxins cause paralysis of the victim, while proteolytic enzymes lead to the breakup and liquefaction of internal tissues; in a short time the predator is able to feed by sucking the internal fluids through the alimentary canal. Robber Fly Description: . In some tribes, the male undergoes axial torsion of 180 degrees. This species of robber fly is usually seen in grasslands and other open areas where wildflowers attract a variety of insect prey.

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