Genus Brachystomella Agren, 1903.
Mandibles absent. Ocelli eight to each side. Post-antennal organ and furcula present or absent. Empodial appendage absent.
This genus is represented in New Zealand by two species, one of which is endemic and the other of world-wide distribution.
|1.||Post-antennal organ present.||2|
|Post-antennal organ absent.||3|
|2.||Tenent hairs long, but not or only indistinctly clavate.||B. parvula Schaeffer|
|3.||Tenent hairs absent.||B. osextara sp. nov.|
Brachystomella parvula (Schaeffer, 1896). Plate 45, figs. 91–93.
1896. Schottella parvula Schaeffer.
Colour: Mottled brown to reddish-violet.
Body: Length 1·0 mm. Cuticle finely-granulate. Ocelli eight to each side.
Postantennal organ rosette-like, with from 5–8 tubercles.
Legs: Claw with one inner tooth and two outer lateral teeth. Two or three indistinctly clavate tenent hairs, sometimes absent, to each foot.
Furcula: Short; mucro tapering and about one-third the length of dens. Dens ventrally with five to six setae.
Locality: Specimens of this almost cosmopolitan species have been found so far in only one locality in this country, namely, Davies Bush, Manurewa, Auckland, from where they were reported by Womersley in 1936.
Brachystomella osxtara sp. nov. Plate 45, figs. 88–90.
Colour: Brown, with black shading around edges when seen from above. Antennae dark blackish-brown becoming black on IV. Legs and furcula bluish-black. Dark posterior band on Abd. V and Abd. VI.
Clothing: Sparsely clothed with short plain setae and on Abd. V and Abd. VI numerous longer, straight, plain setae. Cuticle very finely-tuberculate.
Body: Length 2·3 mm. Antennae slightly longer than head with segments III and IV indistinctly separated. Ant. I: II: III: IV as 10: 9: 3: 11. Ant. IV with many short curved sensory hairs and two short sense rods at apex. No exertile sac. Ocelli eight to each side all large and equal and on dark brown fields. Opposite centre of outer edge of each ocellar field is a strong seta. No trace of any post-antennal organ. Between most segments there are from two to three cuticular folds. Mouth parts elongate and styliform, projecting in front of head, mandibles wanting, maxillae toothed.
Legs: Claw with basal inner blunt tooth and prominent inner tooth just inside half-way down. No outer teeth. Empodial appendage rudimentary, consisting of short, three-toothed ridge. Tenent hairs absent.
Furcula: Well developed, but short. Dens twice length of mucro, tuberculate, pigmented, and with four ventral setae. Mucro with blunt apical tooth and broad spathulate inner lamella.
Locality: Huiarau Range, Urewera Country, in leaf mould in forest, 3,200 ft.
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Type: Slide 3/352, Dominion Museum Collection.
At present known only from the type specimen.