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Last (fifth) Instar.
Head. Length, head: pronotum :: 45:34 Sides of posterior lobe nearly straight and parallel. Eyes and ocelli red, the latter conspicuous but not prominent; the former shaped as in adult, each with about 30 black ommatidia, which occupy only the central part of the red ocular area, and of which the more ventral ones in particular are well separated. Rostral and antennal segments shaped and proportioned as in adult. Pronotum with anterior transverse impression distinct, posterior impression obsolete; posterior margin broadly convex; lateral convexities above coxae uniformly convex, not depoessed towards posterior margin. A little wider across humeral angles than long (38:34); width including lateral convexities 42. The median ecdysial cleavage line well defined on thorax, appearing as a fine white line on metanotum and scutellum, as a sulcus on posterior pronotal lobe, and continued as a faint impression over anterior lobe of pronotum and posterior lobe of head. Scutellum transversely
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subtriangular, posterior margin broadly convex. Front wings pads about ⅔ as long again as pronotum (58.34), reaching to about basal third of abdomen; with a transverse sulcus separating basal corium from apical semitranslucent membrane; whole surface covered with long pale hairs; anal margins meeting or nearly meeting in median line. Hind wing rudiments projecting very slightly beyond apices of the fore. Legs shaped as in adult, length of femur, tibia, tarsus, 47:40:12.5 (front); 48:48:24 (hind). Depth, femur: apex of tibia :: 17:16 (fore); 10:8 (hind). Tarsi of all legs with only one segment. Claws, tibial and tarsal spines as in adult. Colour yellowish brown, thorax and abdomen more or less tinged with pink. Clothed with fine, pale brown, suberect hairs.
Length, about 2.4 mm (dried)
Width, across eyes, 0.29 mm.
Fourth Instar
Very similar in most respects to the 5th, but readily distinguished by the smaller size, fewer ommatidia, shorter wing buds.
Eyes each with only about 10 ommatidia, in a group in postero-dorsal sector of red ocular area. Length, head: pronotum :: 38.30. Length, rostral segments I-IV, 9:7:23:9. Antennal segments II and III relatively short, I-IV, 10:13:13:20. Pronotum as long as wide across humeral angles; anterior lobe half as long as posterior (10:20). Posterior margin of scutellum straight or nearly straight. Front wing sheaths shorter than pronotum (25:30), reaching base of abdomen; without a transverse sulcus; anal margins distantly separated. Hind wing rudiments notably surpassing fore. Both pairs colourless, with erect hairs Length, front coxa, femur, tibia, tarsus, 25:40:33:10. Depth, front femur: tibia :: 15:13. Tibial and tarsal spines as in 5th instar, except that the single ventral spine of the anterior tibiae, the more basal of the two median ventral spines of the hind tibiae, and the outer pair of apical spines of the middle tibiae are very slender and difficult to distinguish from the adjacent hairs.
Length, about 2.3–2.6 mm (alcohol specimens).
Width, across eyes, 0.25–0.26 mm.
Specimens Examined. Mt Sumner, S. I. (moss), 13.4 1952, R. R. Forster (C.M.); 5th (1), 4th (2)