Lomachaeta polemomechana Williams & Pitts, 2009

(Fig. 60)

Lomachaeta polemomechana Williams & Pitts, 2009: 236 . Holotype, ♂, Mexico, Sonora, 30km Agua Prieta (EMUS).

Diagnosis. MALE. The following combination of characters is diagnostic for L. polemomechana: the body is almost entirely black; the mandible lacks a ventral tooth basally; the head and T2 disc have separated punctures; the forewing has its veins encompassing the basal 0.7 × of the wing; the T1 shape is sub-sessile; the T2 fringe is composed of simple setae; and the paramere is virtually straight, subcylindrical, and having evenly distributed short setae. Body length 4–6 mm.

FEMALE. Unknown.

Material examined. USA: Arizona: Santa Cruz County, Ruby Mountain, 20 km SSE Arivaca, 3–7.V.2004, M. E. Irwin and F. D. Parker (1♂, EMUS, Fig. 60) .

Distribution. Southern Arizona, USA and northern Sonora, Mexico.

Remarks. This species has only been found in transition zones between the Madrean Sky Islands and Chihuahuan Desert.