Anyone with the use of my table of families ought readily to recognize any wasp falling in this family, and especially after reading my remarks under the family Mellinidæ. The only group that could possibly cause trouble or confusion would be the subfamily Gorytinæ, which closely resembles the Mellinidæ, but which may be easily separated from the latter by paying close attention to the shape of the first abdominal segment and examining the mesoplueura for the mesosternal suture or carina.