Eleodes
Eleodes is a genus of darkling beetles, family Tenebrionidae. They are commonly known as pinacate beetles or desert stink beetles. They are endemic to western North America, with many species found in the Sonoran Desert. The name "pinacate" is Mexican Spanish, derived from the Nahuatl (Aztec) name for the insect, "pinacatl", which translates as "black beetle." "Eleodes" species range from 8 to 40 mm in length and are black. All produce quinone or similar substances as a deterrent to predators, and many will stand on their heads to spray it. They are found in sandy environments.