Amphialycus (A.) adustus sp. nov.

(Figs. 48–62)

Description. Dorsum (Figs. 48, 49, 50). Length 400 μm; dorsal setal pattern neotrichous, many additional setae on ventral side; sclerotized crista from naso to sensillar area, distances between counterparts of setae vi, sensilla ve and setae in subequal in width, setae vi on separate microplates, striated naso evenly tapering to a blunt end, setae exp very small, sparsely barbed, medial to anterior pair of lateral eye spots, setae in long, pubescent.

Venter (Figs. 51, 54). Genital valves each with 19–22 genital setae; 9–10 anal setae per valve.

Gnathosoma (Figs. 48, 52, 53). Pair of smooth cheliceral setae abaxially; rutella with a pointed process, 1 pair of adoral setae; 5 microtrichous palpal eupathids, separate from each other.

Legs (Figs. 55, 56, 57). Solenidial formula for tarsi, tibiae, genua and femora on legs I, II, III and IV, respectively: 2-2-0-0, 2-2-2-0, 3-2-2-1, 2-0-0-0, solenidion ω2 well removed anteriorly from adaxial end of lyrifissure, famulus II (arrow) ventrodistally.

Larva (n=3, Figs. 61, 62)

Dorsum. Holotrichous; sensillae filamentous, non-swollen.

Venter. Genital valves absent.

Gnathosoma . One pair of palpal eupathids; subcapitulum with 2 pairs of setae.

Legs. Solenidial formula for tarsi, tibiae, genua and femora on legs I, II and III, respectively: 1-1-0, 2-2-2, 3- 2-2, 1-0-0.

Other life stages:

Protonymph (n=5, Fig. 60), 1 genital seta per valve.

Deutonymph (n=5, Fig. 59), 6 genital setae per valve.

Tritonymph (n=5, Fig. 58), 12–15 genital setae per valve.

Adult male (n=5, Fig. 54), 19–22 genital setae per valve, 10 pairs of eugenital setae.

Adult female (n=8, Fig. 51), 19–22 genital setae per valve, 1 pair of eugenital setae.

Type material. Holotype female and 7 paratype females, 5 paratype males, 5 paratype tritonymphs, 5 paratype deutonymphs, 5 paratype protonymphs and 3 paratype larvae from Acacia karroo -biotope, Potchefstroom, NORTH-WEST PROVINCE, 7 February 1969, P.D. Theron. Deposited at ARC-Plant Health and Protection, Pretoria, South Africa.

Additional material. 2 females, 6 tritonymphs, 3 deutonymphs and 8 protonymphs from Acacia karroo, Potchefstroom, NORTH-WEST PROVINCE, 7 February 1969, P.D. Theron.

Differential diagnosis. This species can be easily differentiated from the holotrichous species and from the other neotrichous species of the genus by having an evenly tapering, cone-like and striated naso (Fig. 48), one pair of well-developed adoral setae and the solenidial formula.

Etymology. The specific name refers to the weather-beaten conditions on the collection site.