Bees, hornets, and wasps are categorized as being either solitary or social. Solitary species are those whose members live independently of each other. Social species are those who live together in colonies or nests and which have an adult division of labor or caste system composed of workers, queen(s) and, periodically, males.

The more common solitary groups include the carpenter bees, cicada killers, digger wasps, mud daubers, potter and mason wasps, spider wasps, and velvet ants. The more common social groups include the bumble bees, honey bees, hornets, paper wasps, and yellowjackets.

RECOGNITION.
Body with base of abdomen constricted, sometimes stalked. Wings 4 in number, with front wings a little longer than hind wings; wings with relatively few veins. Antennae moderately long, females 12-segmented and males 13-segmented. Tarsi 5- segmented. Mouthparts chewing but sometimes with a modified tonguelike sucking structure. Females with a well-developed ovipositor modified into a stinger.

In addition, thorax contains a 4th segment, the propodeum, which is actually the basal abdominal segment fused to the thorax; wings without an accessory vein (extra vein behind anal vein) and hind wing with 2 or fewer basal cells.

IDENTIFICATION.
It is necessary to know which group of bees, hornets, or wasps you are encountering. Recognition of whether they are solitary or social, and their particular nesting habits is essential for safety and control. The pictorial key which follows this section will help distinguish some groups. Refer to the treatment of the individual groups for additional help in identification.

It should be noted that there are several other groups of insects which mimic (resemble in appearance and behavior) some of the bees, hornets, and wasps for protecton from potential predators. For example, some of the syrphid flies (Syrphidae) strongly resemble honey bees and wasps, some of the robber flies (Asilidae), hawk moths (Sphingidae), and syrphid flies (Syrphidae) strongly resemble bumble bees, some of the clearwing moths (Sesiidae) strongly resemble yellowjackets, some of the thickheaded flies (Conopidae), clearwing moths (Sesiidae), and beetles (Cerambycidae, Staphylinidae, etc.) mimic wasps, etc. So, do not jump to a quick identification, check the specimen closeiv.

BIOLOGY.
Bees, hornets, and wasps have complete metamorphosis: egg, larva, pupa, and adult. Those which are social have a caste system composed of workers, queen(s), and males (drones). Although the workers are sterile females, they occasionally lay eggs or can sometimes assume reproductive functions if the queen dies. Except for the paper wasps, colonies contain only the founding queen until mid-summer when many queens and males are produced; but honey bees have only one functional queen at a time. With the onset of cold weather, workers, noninseminated queens, and males die off leaving the inseminated queens to overwinter and start new colonies in the spring. Honey bees are the exception where the entire colony including imrnatures, workers, and the queen overwinters. In the solitary bees and wasps, only the inseminated queen overwinters.