Numbers
Nomina Insecta Neartica lists 4 North American genera totaling 9 species.
Identification
Frontwing with only 1 submarginal cell. Antennae rise below the eyes, just above the mouth.
(1)
You can tell the family by the low attachment of the antennae and the spikes/nodules on the frons. (Comment by Matt Bertone)
Food
Larvae are parasites of Metallic Wood-boring beetles (Family
Buprestidae).
Remarks
This is a small and relatively rare group.
Print References
"Peterson's Field Guide to Insects" p. 316
(1)Internet References
The
University of Wisconsin has several species listed in their collection.
The
Natural History Museum of Los Angeles also has severl species listed.
And, though it is out of our country, the
Zoological Museum at the University of Copenhagen has a photo and some information.