1899. Myrmosidæ, Family, Ashmead; Journ. N.Y. Ent. Soc., VII., p. 49 and 52.

1903. Mullidæ, Famille (partim), André; Wytsman's Gen. Ins. Fam. Mutillidæ.

This family, as here defined, is, I think, a natural one, although some of the genera have been placed previously, by different authors, in other families, with the Scoliidœ, Myzinidœ, Mutillidœ, etc.

The females in this family may always be easily recognized by the thorax, which is distinctly divided into itwo parts, while the males, except in three or four cases, are easily distinguished by the genitalia, the hypopygium terminating in a sharp aculeus, which curves upwards, as in males in the family Myzinidæ with which they are often confused.