Update on the status of Africanized honey bees in the western states.

The Africanized honey bee (AHB), Apis mellifera scutella--perhaps better known as the "killer bee"--has arrived in the western United States and in southern California, following a nearly 50-year north-ward migration across South and Central America. First detected near Hidalgo, Texas in October 1993, the bees continue to advance 100 to 300 miles per year by colonizing existing hives or forming new hives in the wild. Although the AHB's "killer" reputation has been greatly exaggerated, the presence of AHBs will increase the chances of people being stung.