Adults and late-instar nymphs of the wide-ranging myrmecomorphic lygaeid Slaterobius insignis were collected in northern Minnesota from cracks of granite outcrops and ledges, a habitat differing somewhat from that reported elsewhere. At two of the four sites, S. insignis was observed in plant-and litter-filled cracks with nymphs of the lygaeid Trapezonotus arenarius. All adults of the polymorphic S. insignis observed on granite were brachypters that belonged to the dark color morph of the species. Individuals occurred on rock surfaces with a black ant, Formica subsericea, which they resembled in appearance and behavior.
Wheeler, A. G. Jr.
"Slaterobius Insignis (Heteroptera: Lygaeidae): Association With Granite Ledges and Outcrops in Minnesota,"
The Great Lakes Entomologist, vol 28
Available at: https://scholar.valpo.edu/tgle/vol28/iss3/4