Key to adult males of Atrichadenotecnum

1. Submarginal markings in fore wing not extending to wing margin, appearing as distinct spots......................... 2

-. Submarginal markings in fore wing extending to wing margin, sometimes continuous............................... 4

2. Fore wing with submarginal markings in cell R3............................................. A. quinquepunctatum

-. Fore wing without markings in cell R3..................................................................... 3

3. Submarginal markings in cell M1 and cell M2 continuous, vein M3 bordered with markings along entire length, hypandrium almost symmetrical with two tiers of processes................................................. A. multidontatum

-. Submarginal markings in cell M1 and cell M2 discontinuous, vein M3 bordered with markings only distally, hypandrium asym- metrical.............................................................................. A. quadripunctatum

4. Fore wing with submarginal markings in cell R3, hypandrium bearing row of strong spikes on anterior and lateral margin.............................................................................................. A. yoshizawai

-. Fore wing without markings in cell R3, hypandrium not bearing strong spikes or only covered with denticles............. 5

5. Hypandrium almost symmetrical with two tiers of processes, pair of ventral projections always bearing denticles and leading postero-laterally, pair of distal processes curved and bearing a row of teeth........................................ 6

-. Hypandrium asymmetrical with denticulated field ventrally, pair of ventral projections asymmetrical and covering denticles, pair of distal processes asymmetrical with right process strongly protruded posteriorly.................... A. trifurcatum

6. Fore wing with pterostigma entirely brown, hypandrium with five developed spines dorso- medially........................................................................................................ A. multispinosus sp. n.

-. Fore wing with pterostigma hyaline basally, hypandrium without those spines..................................... 7

7. Dorsal shelf of clunium weakly developed, hypandrium pair of distal processes with row of sclerotized, blunt plate-like teeth........................................................................................... A. ryukyuense

-. Dorsal shelf of clunium well developed, hypandrium pair of distal processes with row of sclerotized spines.............. 8

8. Fore wing with nodal band continuous, phallosome gradually tapered apically with apex narrow............... A. nudum

-. Fore wing with nodal band discontinuous, phallosome parallel subapically with apex wide and flat........... A. laricolum