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Volume 70, 1940-41
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Genus Pseudachorutes Tullberg, 1871.

Similar in general appearance to Acharutes but the mandibles are without any molar area. Ocelli either eight or five to each side. Post-antennal organ present, always with at least three lobes. Furcula present and well developed. Empodial appendage absent.

Represented in New Zealand by three species, all of which are endemic.

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Key to the New Zealand Species of Pseudachorutes.
1. Ocelli eight to each side, claw without any teeth.
Postantennal organ with five lobes. Colour black. P. algidensis Carpenter
Ocelli eight to each side, claw with teeth. 2
2. Post-antennal organ with four lobes. Colour dark-brown. P. pacifious Womersley
Post-antennal organ with eight lobes. Colour brown with dark transverse band on Abd. IV. P. brunneus Carpenter

Pseudachorutes algidensis Carpenter, 1925. Plate 46, figs. 97–99.

Colour: Black, furcula and distal segments of legs yellow.

Clothing: Evenly clothed with short, plain setae.

Body: Length 2–5 mm. Antennae two-thirds as long as head. Ant. I: II: III: IV as 7: 9: 9: 7. Ant. IV apically with trilobed sensory sac. Ocelli eight to each side. Post-antennal organ with five lobes. Cuticle markedly tuberculate.

Legs: Claw elongate without teeth, but laterally with a series of transverse ridges. Tenent hairs and empodial appendage absent.

Furcula: Manubrium and mucrodens approximately equal. Mucro with small apical tooth and broad inner lamella which terminates before apex.

Locality: Mount Algidus, Rakaia Gorge.

Paratypes in Canterbury Museum, Christchurch, New Zealand.

Pseudachorutes pacificus Womersley, 1936. Plate 45, figs. 94–96.

Colour: Dark brown.

Clothing: Of short, fine setae, rather longer on the antennae.

Body: Length 2·6 mm. Antennae as long as head, third and fourth segments indistinctly separated. Ant. I: II: III: IV as 7: 7: 8: 8. Ant. IV with small apical knob. Sense organ on Ant. III with two curved sense rods. Ocelli eight to each side, all large and equal. Post-antennal organ about equal to an ocellus and consisting of a central core with four peripheral lobes.

Legs: Claw with single inner tooth at about one-third. No outer teeth. Tenent hairs absent.

Furcula: Well developed, dens rather plump and slightly more than twice as long as mucro. Mucro blunt, without teeth, but with basal lamella.

Locality: Reported by Womersley from Brookby, Manurewa, Auckland, and not since found elsewhere.

Pseudachorutes brunneus Carpenter, 1925. Plate 46, figs. 100–103.

Colour: Brown, with Abd. VI darker and dark posterior inter-segmental band on Abd. IV, antennae brown with Ant. IV very dark.

Clothing: Of numerous long, simple setae. Cuticle finely tuberculate.

Body: Length 2·5 mm. Antennae nearly as long as the head. Ant. I: II: III: IV as 7: 8: 7: 9. Ocelli eight to each side. Post-antennal organ with eight lobes.

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Legs: Claw originally stated to have weak tooth in distal half but re-examination of Carpenter's material shows strong inner tooth at about one-third. I can find no trace of weak distal tooth. No outer teeth, empodial appendage rudimentary. Tenent hairs absent.

Furcula: Manubrium slightly longer than mucrodens. Dens with five prominent ventral setae. Mucro with upturned apical tooth and broad inner lamella.

Localities: Mount Algidus, Rakaia Gorge.

Paratypes in Canterbury Museum, Christchurch, New Zealand.