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Volume 70, 1940-41
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Genus Pseudosinella Schaeffer, 1897.

Ocelli usually reduced in number and sometimes absent. Pigment generally absent. Body with hyaline scales as in Lepidocyrtus. Claw with a pair of well-developed wing-like basal teeth sometimes reduced to one. Clavate tenent hairs reduced, mucro bidentate or falciform. Five species of this genus occur in New Zealand, three being endemic, one Australian and one North American.

Key to the New Zealand Species of Pseudosinella.
1. Ocelli present. 2
Ocelli absent. 3
2. Eight ocelli assymetrically arranged to each side. P. assymetrica Salmon
Six ocelli to each side. P. fasciata Womersley
Two ocelli to each side on black pigment spots. P. alba Packard
3. Ocelli entirely absent. P. nonoculata sp. nov.
Ocelli absent from sides of head, but with two yellow-coloured ocelli or pseudocelli on top of head between antennae. P. insoloculata sp. nov.

Pseudosinella assymetrica (Salmon, 1937). Plate 66, figs. 431–434.

1937. Entomobrya assymetrica Salmon.

Further examination of this species has revealed that it has scales and a distinct though small wing-like tooth to the claw, necessitating its transfer to Pseudosinella.

Colour: Pale lemon-yellow in colour with head orange and with a little irregular black mottling on body.

Clothing: Lightly scaled with hyaline scales. Almost deviod of setae but a few ciliated setae occur around the posterior. Tergum of mesothorax carries at apex a tuft of stiff ciliated setae. Antennae lightly clothed with ciliated setae.

Body: Length 0·8–1 mm. Abd. III: IV as 6·5: 15. Antennae four-segmented, segments related as 6: 8: 7: 14. Ocelli, eight on each side. Each ocellar group is assymetrically arranged as two unequal collateral groups of five and three, respectively, the larger being external, the whole set in a triangular mass of black pigment with its apex directed posteriorly.

Legs: Claw with basal wing-like tooth and large inner tooth at centre. No outer teeth. Empodial appendage lanceolate and about two-thirds length of claw. A short, clavate, tenent hair to each foot.

Furcula: Slender, reaching forward to thorax. Dens and manubrium about equal in length, dens corrugated and annulated. Mucro long and slender, bidenate with basal spine.

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Locality: From a collection made by Mr. D. K. Ross from open country in the Manawatu district, near Newbury.

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Type: Slide 3/195, Dominion Museum Collection.

Pseudosinella alba Packard, 1873. Plate 66, fig. 435.

Colour: White.

Clothing: Of hyaline scales.

Body: Length 1 mm. Antennae half as long again as the head, the segments related as 10: 15: 14: 25. Ocelli, two to each side on individual black pigment spots. Abd. IV 2–3 times as long as Abd. III.

Legs: Claw with two short lateral basal teeth, a pair of basal wing-like teeth and a single inner tooth at centre. Empodial appendage often serrate on its outer edge. Tenent hair reduced and non-clavate.

Furcula: Manubrium shorter than mucrodens as 3: 4. Mucro bidentate with basal spine.

Locality: This North American species has been found at Manurewa, Auckland, from whence it was reported by Womersley in 1936. It has not been found elsewhere.

Pseudosinella fasciata Womersley, 1934. Plate 66, fig. 436.

Colour: Mounted, and denuded of scales, greyish-yellow with a band of blue on Abd. III. A slight blue suffusion dorsally on other segments.

Clothing: Simple oval or rounded scales and many finely-ciliated setae. Flexed setae on thorax.

Body: Length 1·5 mm. Antennae half as long again as head, the segments related as 10: 25: 25: 37. Ocelli, six on each side. Abd. IV four times as long as Abd. III.

Legs: Claw with a pair of inner basal wing-like teeth and a small distal inner tooth. Empodial appendage broad and truncate apically. Tenent hair half as long as claw and distinctly clavate.

Furcula: Heavily scaled. Manubrium slightly longer than mucrodens. Mucro bidentate with basal spine.

Locality: This common Australian species was reported in New Zealand by Womersley in 1936 from Clevedon, Auckland. It has not been found elsewhere.

Pseudosinella insoloculata sp. nov. Plate 66, figs. 437–439.

Colour: Entirely white.

Clothing: Of hyaline scales and short ciliated setae.

Body: Length 1 mm. Antennae half as long again as head, the four segments related as 7: 22: 20: 44. Tergum of mesothorax covers prothorax and is approximately equal to the head in length. There are two deep yellowish-coloured ocelli on top of the head between the bases of the antennae; these may be pseudocelli, but they have the appearance of true ocelli. No other ocelli are present. A sensory organ at apex of Ant. IV consisting of a central rod with two inwardly-curving protecting setae, Abd. IV four times longer than Abd. III. Ventral tube long and lobed distally.

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Legs: Claw with two small outer lateral teeth about one-third down and two large basal wing-like teeth closely adpressed, giving the appearance, without close study, of being only one; immediately below and apparently arising between them is a single large median inner tooth. Empodial appendage lanceolate, two thirds as long as claw. Tenent hair very weak, short and non-clavate.

Furcula: Manubrium and mucrodens approximately equal in length. Dens corrugated and annulated, the uncorrugated portion being two and a-half times length of mucro. Mucro elongate and bidentate, with a basal spine, the apical tooth the smaller. Mucro surrounded with strongly-ciliated setae.

Locality: Waipoua Kauri Forest, amongst leaf debris.

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Type: Slide 3/830, Dominion Museum Collection.

Pseudosinella nonoculata sp. nov. Plate 66, figs. 440–441.

Colour: In life, white; mounted, a pale dirty yellow.

Clothing: Occasional scales and short ciliated setae. Dorsally on head are many flexed setae very strongly ciliated.

Body: Length up to 1·3 mm. Antennae approximately one and three-quarter times as long as head, the four segments related as 7: 20: 15: 27. Ocelli absent. Segmentation of body very indistinct, but Abd. IV is 2 ½–2 ¾ times as long as Abd. III.

Legs: Claw with a pair of large wing-like basal teeth and a large inner basal tooth about one-third down. A single clavate tenent hair, shorter than claw, to each foot. Empodial appendage half as long as claw and truncate on inner margin.

Furcula: Manubrium and mucrodens approximately equal in length. Dens strongly annulated and corrugated with numerous stout, strongly-ciliated setae. The uncorrugated portion is twice length of mucro. Mucro very elongate, bidentate, with a basal spine and surrounded by strongly ciliated setae. Mucronal teeth considerably separated, the apical tooth the larger.

Localities: Waiho Gorge, South Westland, amongst leaf mould in forest; Buller Gorge, under bark of beech trees; Alex Knob, Waiho, in leaf mould, 3,000 ft.; Punakaiki, amongst leaf debris in forest.

Remarks: This species is closely allied to P. violenta Folsom from North America, from which it differs chiefly in the structure of the foot claw, empodial appendage and mucro.

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Type: Slide 3/831 and Figured Paratype: Slide 3/832, Dominion Museum Collection.