Lindorus lophanthae Purple Scale Predator, 100 - LIN100Ships Monday Thursday. Ships via Overnight methods. Lindorus lophanthae is a black lady beetle that thrives in temperatures of 59 77 F and a relative humidity of 20 90%. Both adults and larvae feed on soft scale, including purple, black, brown, and red, as well as mealybugs and insect eggs. Appearance: Small (2. 5 mm. 1 10 in.) shiny, black lady bird beetles. The larvae are grey alligator shaped with light colored bands running along the abdomen.