Robberflies are considered 'hanging thieves' becaue they use their arms to suspend themselves from twigs and branches and steal a meal from unsuspecting flying insects. A passerby like a bee, wasp or other fly don't see them as they roam. If they are spotted and within range, the Robberfly will chase the flying insect, eventually overtaking them. Once caught, the Robberfly uses its legs to hold the prey and carry it to a nearby plant. It then uses its sharp mouth to stab the victim and then suck out the victim's insides.
They make a loud whirring noise as they fly because they beat their wings so rapidly. The Efferia species male is slightly darker than the female. At the tip of the male's abdomen is black 'bulb' Females do not have this feature; instead they have long needle-like ovipositors, which they use to inject their fertilizes eggs into the soil. It may look like a stinger at first glance, but it is not a stinger. Both genders can be found hanging around in open fields, parks, meadows and other dry areas.
©2005-2016 www.InsectIdentification.org. All Rights Reserved. No Reproduction Permitted. Unauthorized use and/or duplication of this material without express and written permission from www.InsectIdentification.org is strictly prohibited. Material presented throughout this website is for entertainment value and should not to be construed as usable for scientific research or medical advice (insect bites, etc...). Please consult licensed, degreed professionals for such information. Email corrections / Comments to InsectIdentification at Gmail dot com.