‘Twas a grand day to hike Hondo. I spotted a new caterpillar, and learned more about it when I got home. The genista broom moth, Uresiphita reversalis, is light to medium brown with a dark spot on each top wing. The hindwings are yellow or orange with some brownish-gray shading toward the edges. Genista caterpillars feed on acacias, brooms (Genista spp., thus the common name) and lupines, among other species. They ingest and store alkaloids from their host plants, which make the worms bitter or even toxic to mammals, birds and some insect predators. So don’t try eating them!