(Figs. 33, 36, 200)

Description. Head reddish brown to black, interfrontal plates usually darker than frontal triangle and orbital plates, prementum and maxillary palp brown. Face reddish brown laterally, blackish medially. Antenna with scape, pedicel, and base of first flagellomere orange, rest of flagellomere dark brown. Pollinose except shiny spots lateral to ocellar triangle. Ocellar bristles about 1 ocellus width anterior to medial ocellus. Interfrontal setae in about 5 pairs. Anterior genal bristle enlarged about 0.5X length of vibrissae.

Thorax dark brown to black, covered with microtomentum except tiny ventral spot on anepisternum. Halter whitish with some brown below knob.

Legs dark brown to black, coxa 1, trochanters, and joints of femora and tibiae paler. First basotarsomere with a small, dark spur in males. Tibia 2 with row of anterodorsal, 1 anteroventral, 1 posteroventral, and 3 subapical bristles. Tibia 3 with 3 ventroapical bristles.

Wing pale brown, slightly paler spots on crossveins and 2 on vein R 4+5.

Abdomen with tergites and sternites dark brown and heavily sclerotized in both sexes, covered with microtomentum.

Male postabdomen: Sternite 5 broad, posterior margin with a medial projection bearing a pair of finger-like projections, anterior apodeme about as long and 0.4X width of external portion (Fig. 36). Surstylus narrow, distal portion parallel-sided. Pregonite distinct, fairly large. Postgonite with lobes well-separated, anterior lobe broad, rounded, posterior lobe long, pointed. Basiphallus with short, narrow epiphallus, broad bilobed preepiphallus. Ejaculatory apodeme relatively large. Distiphallus with a short smooth dorsal tube (Fig. 33).

Female postabdomen: Tergites 6–7 and sternite 6–7 moderately sclerotized, slightly wider than long, entirely covered with microtomentum, tergite 7 shiny with anterior margin doubly emarginated, microtomentum along posterior margin, sternites with anterior margin rounded. Tergites with 3 posterior strips, sternites with 2 posterior strips. Tergite 8 slightly narrower posteriorly, anterior margin deeply emarginated, posterior third covered with microtomentum. Epiproct with narrow anterior arms, shiny, with 1 pair of setae. Cerci narrow. Sclerites of sternite 8 pointed anteriorly, sculptured apically, distal quarter covered with microtomentum. Hypoproct semicircular, heavily sclerotized. Spermathecae round, with basal invagination, sclerotized duct about 2X length of spermathecae.

Type material. Holotype ♂: CHILE: Maule: Altos del Lircay Natl. Res., ~ 3000 m, streamside pans, 29 Nov 2006, S.A. Marshall, debu00283947 (MNNC). Paratypes: same data as holotype (5 ♂, 8 ♀, DEBU); as above but no collection method (1 ♂, DEBU); Aisén: Cerro Castillo Res. Nac., 40 km SW of Balmaceda, 1100 m, dry open beech forest, carrion trap, 2–27 Jan 1985, S. & J. Peck (1 ♂, DEBU); Valparaíso: La Campana Natl. Pk., hygrophilous forest, leaf litter Berlese, 2 Dec 1984, S. & J. Peck (1 ♀, DEBU). ARGENTINA: Neuquén: Lolog, 7 km N San Martín de Los Andes, 900 m, nr. muddy bank of pond, pan traps, 23–30 Nov 1989, S.A. Marshall (1 ♂, DEBU); as above but 1000 m, 20 Nov 1989, (1 ♂, DEBU); Lolog, 7 km N San Martín de Los Andes, Gentili Cabin, pans & FIT along streambed, 18–21 Nov 1989, S.A. Marshall (1 ♂, DEBU); as above but forest and meadow, pooled pan & FIT traps (1 ♂, DEBU); Lolog, 7km N San Martín de Los Andes, Gentili property, 900 m, nr. pond, FIT, 23 Nov–1 Dec 1989, S.A. Marshall (1 ♀, DEBU).

Comments. The species name is from the Greek di (two) + dactylos (finger), referring to the paired finger-like projections of the male sternite 5. This species is quite similar to A. simplicimanus, with which it co-occurs at some sites; this species can be separated by the uniformly microtomentose scutellum and hind femur.