This amazing little creature is a Tiger Fly in the genus Coenosia, and I believe C. tigrina. Photographed on May 30, 2021 with prey that appears to be a spittlebug nymph.
This particular tiger fly is a European native, introduced to North America in the 1800’s. It is now found throughout the northeastern and western United States and adjacent Canada.
Tiger flies, also sometimes known as hunter or killer flies, are indeed fantastic predators of other pest insects, including Drosophila sp. flies. Even the larval stage of this fly is predatory on other organisms. Because of their success in hunting, they are often used as biological control of pests in greenhouses.
I found this tiny (approx 4.5mm) Scarab yesterday when I went out to pick the remaining few tomatoes in the garden. It came in with me just long enough to get a few photos so I could attempt an ID. If I’d kept it long enough to realize what I had, I might have tried for better pics. Instead, I returned it to a sunny spot outdoors and let it go about its business in the garden.
After an internet search, I came up with a preliminary ID to subfamily Aphodiinae, but I believe this specimen to be in the tribe Aphodiini and possibly (Agoliinus sigmoideus). This is where my frustration begins as I definitely need my specimen back for further examination in order to confirm. For now, we’ll leave it at Aphodiinae.
The Aphodiinae are dung beetles that feed on detritus and more. Bugguide references the work of Skelley (2008) and states, “many feed on dung, some are detritivores, psammophiles, saprophages, inquilines with ants or termites, or may potentially be predators; adults with reduced mandibles are suspected to feed primarily on bacteria or yeast-rich fluids in dung or decaying materials.”
Reading about dung beetles in general, I came across an interesting publication in Biological Control that examined how some species of coprophagous dung beetles can reduce the contamination of bacteria like Escherichia coli in agricultural systems when flies, livestock, or wildlife are present. Aside from providing other important ecosystem services like feces removal and nutrient recycling, the aspect that they also help with food safety by reducing harmful bacteria is another reason we need to invest in organic agricultural systems that do not rely on harmful pesticides, fertilizers, and herbicides which alter the natural biological processes at work. In short, nature does it best!
Aphodiini San Juan Island, WA 10.21.2020Aphodiini San Juan Island, WA 10.21.2020
Bugging You From San Juan Island 