Smicromutilla Mickel, 1964 .

Type species: S. powelli Mickel, 1964 . Synonymized by Williams & Pitts (2009).

Diagnosis. FEMALE. Females of Lomachaeta can be recognized by the following combination of characters: the body setae are sparse, nowhere obscuring the sculpture; the mesosoma has coarse sculpture and lacks a scutellar scale; T1 is slender, with its shape either sub-sessile or sub-disciform; the tergal fringes are not composed of distinctly plumose setae; and T6 lacks a defined pygidium.

MALE. Males of Lomachaeta can be recognized by the following combination of characters: the body setae are sparse, nowhere obscuring the sculpture; the axilla is armed with a posteriorly directed tooth; T1 is slender, with its shape either sub-sessile or disciform; the tergal fringes are not composed of distinctly plumose setae; and the digitus is sessile with the usually short pad-like cuspis.

Distribution. Widespread in the New World, from Canada to Argentina.