The large Horse-Bean Longhorn Beetle lives in and loves states in the southern latitudes, from coast to coast.
Horse beans are large edible broad beans or fava beans. The plant is tender and uses a trellis, woody shrub, or tree as a growing support. The Horse-Bean Longhorn Beetle lays its eggs on a variety of trees commonly found in southern United States and Mexico. Citrus, ficus, willow and hackberry trees are common host plants. Larvae hatch and bore into the trees where they remain until they emerge as adults. Bright red/fuchsia saguaro cactus fruits are a juicy food source for populations living in or near the Sonoran desert.
Male Horse-Bean Longhorn Beetles have large jaws extending from the head that are used to battle other beetles trying to partake of a claimed cactus. Females lack these menacing mandibles. The black beetle has two thick, bright orange or yellow bands across each elytron (wing covering) that may or may not connect. A black line runs down the center of the back. Long antennae have alternating bands of black and yellow with curved yellow tips. Legs are black at the base and then yellow through to the foot.
Scientific Name: Trachyderes mandibularis
Other Name(s): Long-Jawed Longhorn Beetle
Size (Adult; Length): 17mm to 32mm (0.66in to 1.25in)
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns. Grayed-out selections indicate that the subject in question has not been reported in that particular territory. U.S. states and Canadian provinces / territories are clickable to their respective bug listings.
Antennae: Beetles have a pair of antennae on the head used as sensors.
Head: The head is home to the insect's eyes, antennae, and mandibles (jaws).
Thorax: Holds the three pairs of legs as well as vital internal organs.
Elytron: One of two wing cases on a Beetle that protects its wings (plural: elytra).
Wings: Appendages used for flying and kept under the elytra until needed.
Abdomen: Houses organs related to circulation, reproduction, and excretion.
Legs: Beetles have three pairs of legs located at the thorax, numbering six legs in all.