Identification. This information applies to all dangerous wasps found in the United States except the mutillids (previously discussed). Wasps are elongate insects with three distinct body parts and four wings. As with all winged forms of Hymenoptera, the front pair of wings is larger than the hind pair. Only the female wasps are equipped with a stinger at the posterior end of the abdomen. To distinguish wasps from similar-appearing bees, the specimen’s thoracic hairs should be examined microscopically to determine if they are smooth (a wasp) or feathered (a bee). In the United States, members of the paper-wasp family (Vespidae) are generally considered to be the most dangerous because of their social nesting habits, aggressive behavior, and abundance. Two representative members of the Vespidae family found in North America are the bald-faced hornet, _Vespula maculata_, and a common yellow jacket, _V. pennsylvanica_. Although it takes an expert to identify most wasps according to species, the paperlike nests of the vespids make their identification easy. Another important group of dangerous wasps easily distinguished by their nests are the mud daubers. These wasps usually build their mud nests in the corners of man-made structures. Besides their distinctive nests, mud daubers are identified by their dark shiny color and long narrow waist. Distribution. Dangerous species of wasps can be found throughout the United States. Biology/Behavior. Most vespids are social insects that feed primarily on other arthropods. These wasps build paperlike nests by masticating wood fiber into pulp. In addition to the social wasps, many types of solitary wasps are capable of envenomization; but these wasps are easy to avoid since they are neither abundant nor aggressive. Female members of the dangerous wasp species will readily attack and inject their venom if someone disturbs or annoys them. Wasp stingers do not become detached, and a single wasp can sting a victim several times before retreating. Social wasps are particularly dangerous because a disturbance of their nest may result in attack by numerous wasps. Avoidance/Control. Avoid garbage accumulation sites, which attract wasps. To avoid wasp stings, recognizing the nests of the dangerous species in the local area, is important. If possible, remove and destroy all nests found around inhabited areas. Wasps can be controlled by treating their nests with insecticide—preferably at night, when the wasps are least active. Treat nests found above the ground with a commercial wasp spray or other insecticide recommended by an entomologist. To treat wasp nests in the ground or in houses, a 5% carbaryl dust may be used.[38] Envenomization Reaction/Treatment. (See appendix.) URTICATING/VESICATING ARTHROPODS 1. BLISTER BEETLES (Order: Coleoptera; Family: Meloidae) [Illustration: (unlabelled)]