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This page contains pictures and information about Robber Flies that we found
in the Brisbane area, Queensland, Australia.
- Giant Robber Fly - one of the largest fly species with wing-spans up to
75mm
The Robber Flies are air hunter. They also known as an Assassin Fly and
Bee Killer.
They have strong legs which can catch prey on flight. They are medium to large
size flies with large eyes and necked head. They are active predators on flying
insects, unselective in prey species. They even prey on web weaving spiders.
Their mouthparts are the triangular proboscis
which insert into prey and suck the juice.
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- Bee
Killer
Spider predator
Their larvae live in soil and rotting wood and are predaceous on other insect
larvae.
Robber Flies can be found in forest, bushland and garden. We found quite a
number of different species, although most of them we cannot identify to species
level.
Subfamily Asilinae
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- Cerdistus constrictus, subfamily Asilinae, body length 25mm
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- Most Robber Flies are reddish-brown in colour. Different species that we
found are looked similar and hard to be identified. Their
mouthpart is the large pointed proboscis. Their thorax and legs are hairy.
Their abdomen are long and thin. They are commonly seen in our backyard and in
the bushes in Brisbane.
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- ? Neoitamus sp. , body length 25mm
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- Most Robust flies are with noticeable "beard" of setae around the face. It is
believed that they serve as protection to their face from damage by their prey.
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- The above pictures show the Robust fly mating pair. We can see that the
male and female are look similar.
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- ? Neoitamus sp. body length 20mm
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- Robber flies are active predators. They usually rest on leaf or
stick about one to two meters above ground, watching if there is any prey flies
pass. Robber flies will capture prey by their powerful legs in mid air and
consume while on the wings.
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- ? Ommatius sp., body length 15mm
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Subfamily Leptogasterinae
- Robber Fly
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- Leptogaster sp., body length 15mm
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Subfamily Dasypogoninae
- Wasp-mimic Robber Fly
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- ? sp., body length 25mm
- In mid summer we found this Wasp Mimic Robber Fly hunting on the ground among the dry leaves
in Mt Cotton bushland. At first we thought it was a wasp and put those
pictures in our Vespid
Wasps page. Rob Longair,
University of Calgary, send us email and advised that "It is
actually a robber fly (Diptera: Asilidae) mimic of a wasp. The antennae and the
stance in the second picture are typical of robber flies." Here we would
like to thank Rob again.
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- During mid-summer in the rainforest near Mt Nebo, we found this Wasp-mimic
Robber Fly mating pair.
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- Giant Robber Fly
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- Phellus olgae, body length 45mm
- This is one of the largest fly species with wing-spans up to 75mm. We saw
this fly once in Daisy Hill Forest during later summer. It was resting on a
large tree trunk. We noticed the fly by its large compound eyes and golden
hairs on its face. It flied fast in short distance with loud buzzing sound.
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- The Giant Robber Fly has a dark brown body, a pair of golden brown wings,
black long and strong legs with short dense golden yellow hairs.
Subfamily Laphriinae
- Zebra Robber Fly
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- ? sp., body length 20mm
- The Robber Flies have alternating black and white strips on body so we
called them Zebra Robber Flies. We saw them once in Karawatha Forest during
mid summer.
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- This Rubber Fly waits for prey on tree trunk.
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- Robber Fly
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- ? Laphria sp., body length 20mm
- This Robber Fly likes to rest on the floor of footpath. We saw many of them
in the rainforest near Mt Nebo. The Robber Fly in the above photos had just
captured a small black wasp.
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Robber Fly Attacked Spider
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- Leptogaster sp., subfamily Leptogasterinae, body length 15mm
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- Insects are not always be the prey of spiders. Some insects attack spiders.
Robber Fly is one of those insects. On a early summer day afternoon, a medium
size Silver
Orb Wed spider was building its web. The spider had finished laying the
frame threads and radius of the web and about to put on the sticky spiral silk.
There was a medium size Robber Fly flying over the spider web. After the fly circled
two rounds, it attacked the spider on its abdomen. The fly punch its mouth
parts into the spider body. There was only very little struggling, then all
become motionless. The Robber Fly start feeding the spider on the unfinished
spider web. We believed if the spider web were finished, the Robber Fly may not win so
easily.
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Robber Fly feeding on spider, fly body length 12mm.
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