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Volume 70, 1940-41
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Genus Bourletiella Banks, 1906.

Species with 2–3 clavate tenent hairs to each foot. Empodial appendage present or absent. Mucronal bristle absent.

Two species and one subspecies of this genus occur in New Zealand, of which the subspecies only is endemic.

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Key to The New Zealand Species of Bourletiella.
1. Colour entirely yellow, with both pairs of curved clasping spines on dorsal surface of the anal segment of male pointing posteriorly. B. arvalis Fitch
With posterior dorso-lateral portion of body violet pigmented and having a regular pattern of yellow spots B. arvalis subsp. dorsobscura nov.
2. Colour blue or slatey-blue, the pairs of clasping spines of male pointing in opposite directions. B. hortensis Fitch.

Bourletiella arvalis Fitch, 1863. Plate 72, figs. 517–518.

Colour: Body and legs entirely yellow. Antennae orange-brown, furcula pale yellow.

Clothing: Of stout, gently curved, simple setae.

Body: Length up to 1.5 mm. Antennae four-segmented, with fourth segment subdivided into seven sections, being a basal very long section, five equal smaller sections, and a long terminal section not so long as the basal. Ocelli, eight to each side, on black fields. The central and inner adjacent ocelli smaller than the rest. Curved clasping spines of male on dorsal aspect of Abd. VI pointing posteriorly.

Legs: Claw with two exterior lateral teeth and one inner tooth at about one-third. Empodial appendage about two-thirds as long as claw, and lamellate. Three long clavate tenent hairs (sometimes reduced to two) to each foot, longer than claw.

Furcula: Dens three times as long as mucro. Mucro spoon-like without teeth or serrations.

Localities: First reported from Clevedon, Auckland, by Womersley in 1936. I can now record it from Lake Waikaremoana, amongst rushes in a swamp on the edge of the lake; Lake Wanaka, under stones on a hillside by the lake; Awahuri, Palmerston North, in debris under kowhai trees.

Subspecies dorsobscura nov. Plate 71, figs. 515–516.

This subspecies differs from the typical form in that the hinder dorso-lateral part of the fused portion of the body is pigmented with deep violet which generally has a regular pattern of small yellow spots showing through.

Locality: On the sea coast near Thames, Coromandel Peninsula, amongst grass. Very common.

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Type: Slide 3/1001, Dominion Museum Collection.

Bourletiella hortensis Fitch, 1863. Plate 72, fig. 519.

Colour: Dark blue to slatey-blue. Ocelli on black fields.

Body: Similar to B. arvalis except that curved clasping spines of male point in opposite directions.

Legs: Claw with two exterior lateral distal deeth and one inner tooth at two-thirds. Empodial appendage and tenent hairs as in B. arvalis.

Furcula: Dens two and a-half times as long as mucro. Mucro as in B. arvalis.

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Localities: First recorded in New Zealand from Lincoln College farm by Carpenter in 1925, and later from Christchurch, attacking strawberries, by Womersley in 1936. I have found it in large numbers amongst grass on the coast immediately north of Thames, Coromandel Peninsula.