They can be separated from other bee families by the presence of two subantennal sutures on the face, a primitive trait shared with the sphecoid wasps. Many groups also have depressions or grooves called "foveae" on the head near the upper margin of the eyes, another feature seen in sphecoids, and also shared by some Colletidae.
These bees can be identified by two subantennal sutures on their face, a primitive trait shared with sphecoid wasps. Many groups also have depressions or grooves called "foveae" on the head near the upper margin of their eyes, another feature seen in sphecoids and some Colletidae.