. The Australian zoologist. Zoology; Zoology; Zoology. FRASER. 153 2. CuP arching strongly upwards on leaving the discoidal cell Synlestidae Till. CuP not arched strongly at this point 3. 3. R4 + 5 and 1R3 both arising far proximal to the level of subnodus, 1R3 usually at least half-way between arculus and subnodus and usually nearer the arculus 4. R4 + 5 and 1R3 arising nearer the subnodus than arculus; at the most, R4 + 5 arising half-way between arculus and subnodus 5. 4. Veins CuP and 1A complete; supplementary sectors present between 1R3, R4 + 5 and MA . Lestidae auct. Vein CuP greatly re
. The Australian zoologist. Zoology; Zoology; Zoology. FRASER. 153 2. CuP arching strongly upwards on leaving the discoidal cell Synlestidae Till. CuP not arched strongly at this point 3. 3. R4 + 5 and 1R3 both arising far proximal to the level of subnodus, 1R3 usually at least half-way between arculus and subnodus and usually nearer the arculus 4. R4 + 5 and 1R3 arising nearer the subnodus than arculus; at the most, R4 + 5 arising half-way between arculus and subnodus 5. 4. Veins CuP and 1A complete; supplementary sectors present between 1R3, R4 + 5 and MA . Lestidae auct. Vein CuP greatly reduced, vein 1A entirely absent; two straight sup- plementary sectors present, one between R2 and 1R2 and another between 1R2 and R3 Lestoideidae Till. 5. Nodus situated very close to base of wing, at from one-sixth to one- fourth the wing-length; pterostigma absent, or if present, abnormal, not fully chitinized, or made up of several cells, never braced .. .. PSEUDOSTIGMATIDAE aUCt. Nodus lying more distal, usually more, than one-fourth the wing- length from base (if nearer, then the pterostigma normal) ; ptero- stigma present, strongly chitinized (rarely hypertrophied), braced or unbraced 6. 6. Supplementary sectors present distally and extending proximal as far as the level of pterostigma or further .. .. Megapodagriidae Till. Supplementary sectors absent or at most a few distal cellules aligned and not extending proximal as far as pterostigma .... 7. 7. Vein 1A absent or greatly reduced; vein CuP normal or reduced .. 8. Veins CuP and 1A normal .. _ 9. 8. An extra cross-vein present in the postcostal space, very close to base of wing and in addition to that of the anal-crossing (Ac) ; number of postnodals comparatively large .. Platystictidae Fraser. No additional cross-vein in the postcostal space; number of post- nodals comparatively small Protoneuridae Till. 9. Discoidal cell subrectangular; no marked zig-zagging of any of the main veins (only distal portion of MA slightly
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