Lomachaeta litosisyra Williams & Pitts, 2009

(Fig. 63)

Lomachaeta litosisyra Williams & Pitts, 2009: 234 . Holotype, ♂, USA, Arizona, Santa Cruz Co. (EMUS).

Diagnosis. MALE. This species can be immediately recognized by the unique genitalia, wherein the paramere is elongate, gradually downcurving, cylindrical, and having an apical tuft of long setae. The following characters are also useful for diagnosis: the body is entirely blackish, except the sometimes reddish tegulae; the head has separated punctures; the mandible is unarmed ventrally; the forewing has its veins encompassing the basal 0.7 × of the wing; the T1 shape is sub-sessile; the T2 disc has coarse punctures; and the T2 fringe is composed of simple setae. Body length 4–6 mm.

FEMALE. Unknown.

Material examined. USA: Arizona: Pima County, Vail Mountain Creek Ranch, 18–25.IV.2006, 1100 m, malaise trap, M. E. Irwin (1♂, paratype, CSCA, Fig. 63) .

Distribution. Sonoran Desert in southern Arizona, USA and northern Sonora, Mexico.

Remarks. The elongate, down-curving, cylindrical paramere shape is unique in Lomachaeta . This morphology is superficially similar to that of L. vacamuerta, except that species has shorter, straighter parameres. The length and curve, however, are similar to that of L. beadugrimi and L. snellingella, except those species have dorsoventrally flattened parameres without an apical setal tuft.