Insect antennae. (Clockwise from upper left) Moth (Image courtesy of Geoffrey Attardo, Yale School of Public Health); Leconte's Scarab, Chrysina lecontei (Image courtesy of Alex Wild); nymph of Barytettix humphreysi (Image courtesy of Jeffrey C. Oliver); meloid beetle, Lytta magister (Image courtesy of Jeffrey C. Oliver); butterfly (Image courtesy of Geoffrey Attardo); beetle (Image courtesy of Geoffrey Attardo); ant (Image courtesy of Alex Wild); lubber grasshopper (Image courtesy of Geoffrey Attardo); bald-faced hornet, Dolichovespula maculate (Image courtesy of Gary Alpert, CDC/Harvard University). (Center) Mesquite bug nymph, Thasus neocalifornicus (Image courtesy of Alex Wild).