Genus Acomatacarus Ewing 1942.

Acomatacarus lygosomae n.sp. (Figs. 4–7.)

Larva: Palpi rounded laterally. First palpal hair plumose, second simple. Palpal thumb small, conical. Palpal claw bifid. Cheliceral teeth in both dorsal and ventral series extending to half length of chelicerae, dorsal teeth larger and recurved. Scutum transverse, sub-pentagonal, anterior margin shallowly concave, posterior margin convex, lateral margins straight or slightly convex, converging anteriorly. Scutum beset with sparse asperities or pits behind median setae and in front of and between the sensillae bases. Sensillae long, filamentous, simple (?). All scutal setae flattened, broad, lanceolate, with median rib, edges fringed. Median anterior scutal process more than half the length of the median setae, rounded apically, constricted behind mid-length. Scutal measurements (in microns) :—

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Width between anterior median setae 13 microns in type. Eyes contiguous, anterior larger and more circular distant from scutum one diameter. Dorsal abdominal setae numerous, about 100, similar to scutal setae, arranged as in figure. Legs: length (microns) I, 301; II, 260; III, 287; coxal setae 2,1,1; tarsal claws 3,3,3. Ventral setae, two on head capsule, two between coxae III, numerous setae posteriorly. Body length (microns) 698, width 397.

Host: Lygosoma grande Gray. (?) Coll. G. Garrow.

Locality: Meek's Hill, Weston, Oamaru, N.Z.

Location of Type: Type and four paratypes in Cawthron Institute Collection, Nelson, N.Z.