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Volume 84, 1956-57
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Genus Hybolasius Bates

Hybolasius genalis Broun (Figs. 37 and 38).

Mature Larva. Length up to 10 mm. Slender, elongate, tapering posteriorly. Colour white.

Head (Fig. 37) elongate, widest at mid-length, tapering posteriorly, not pigmented to mid-length. Mandible of normal Lamiinae type. Clypeus trapezoidal. Labrum transverse.

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Text-fig 5.—Hexatricha pulverulenta. Fig. 33—Larva, head. Fig. 34—Larva, mandible, external face. Fig. 35—Larva, mandible, buccal face. Fig. 36—Larva, thorax dorsal. Hybolasius genalis. Fig. 37—Larva, head. Fig. 38—Larva, abdomen penultimate segment dorsal. Soma-tidia antarctica. Fig. 39—Larva, head. Fig. 40—Larva, abdomen penultimate segment dorsal, Tetroria cilipes. Fig. 41—Larva, head. Xyloteles griseus. Fig. 42—Larva, head.

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Maxillary palp 2-jointed, joints sub-equal in length, second joint slightly shorter than second joint of labial palp. Mentum distinct, short, transverse, bearing one seta on each side. Sub-mentum with one seta on each side near anterior angle. Epistoma straight, with three setae on each side. Front pigmented to mid-length, with 3 or 4 setae. Antennae retractile, antennal ring not bisected by frontal suture. One ocellus. Hypostoma with one seta on each side of median suture. Gular sutures not evident.

Thorax. Pronotum transverse but not twice as wide as long, separated anteriorly from pro-alar area, notal spots not distinct, obscurely striate posteriorly. Presternum fused with epipleurum. Eusternum not distinct. Legs vestigial.

Abdomen with epipleurum protuberant on last three or four segments. Pleural tubercle distinctly sclerotized and pigmented at ventral end. Ampullae indistinct, poorly developed, irregularly tuberculate or finely alutaceous. Two pigmented para-median spines close together on posterior margin of 9th tergum (Fig. 38).

This species was found under the bark of dead Pinus radiata at Waiotapu. Larvae, pupae and adults were present in February.

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