72 A. WATSON 



Key to the Species 

 Males 



i Antemedial fascia and postmedial fascia of upper surface of fore wing lunulate, or if 



non-lunulate then sharply angled near costa ....... 4 



- Antemedial fascia and postmedial fascia of upper surface of fore wing non-lunulate, 



not angled near costa ........... 2 



2 Subterminal fascia of upper surface of hind wing either absent or represented by row 



of dark neural spots ; wing not pale yellow ....... 5 



- Subterminal fascia either absent on upper surface of hind wing, in which case wing 



is pale yellow except at anal margin, or represented by continuous pale line . 3 



3 Subterminal fascia absent on upper surface of hind wing ; fore wing strongly 



falcate (PI. 3, fig. 323) ; eighth sternite in male genitalia without eversible sacs 

 laterally (Text-fig. 129) ....... bicostata (p. 74) 



- Subterminal fascia on upper surface of hind wing represented by a continuous pale 



line ; fore wing weakly falcate (PI. 3, fig. 322) ; eighth sternite in male genitalia 



with long eversible sac on either side ...... vira (p. 73) 



4 Antemedial and postmedial fascia of upper surface of fore wing lunulate (PI. 4, 



fig. 329) .......... undata (p. 90) 



- Antemedial and postmedial fascia of upper surface not lunulate (PI. 4, fig. 328) 



humerata (p. 90) 



5 Ground-colour of upper surface of fore wing orange-bluff ; anterior half of hind wing 



without markings (PI. 4, fig. 326) ...... siccifolia (p. 87) 



- Ground-colour of upper surface of fore wing not orange-buff ; anterior third of hind 



wing without markings (e.g. PI. 4, fig. 327) ....... 6 



6 Outer margin of fore wing angulate at Cwia (PI. 4, fig. 327) . . recava (p. 84) 



- Outer margin of fore and hind wing not angulate at Ciii & ..... 7 



[The remainder of the Key is based entirely on characters in the male genitalia.'] 



7 Diaphragma with three short medial spines ; socius with short, non-arcuate, apical 



spine ; posterior margin of eighth sternite convex (Text-figs. 158-160) duplicata (p. 88) 



- Diaphragma without medial spines ; socius with arcuate apical spine ; posterior 



margin of eighth sternite emarginate medially ...... 8 



8 Lateral spines of diaphragma extending inwards across medial line (PI. 7, fig. 342) 



lilacina (p. 87) 



- Lateral spines of diaphragma not extending across medial line .... 9 



9 Socius with two arcuate apical spines (PI. 10, fig. 353) . . . ochrozona (p. 88) 



- Socius with single apical spine .......... 10 



10 Apical spine of socius longer than basal part of socius (Text-fig. 138) problematica (p. 77) 



- Apical spine of socius shorter than basal part of socius . . . . . 11 



1 1 Anterolateral processes of diaphragma triangular, sharply pointed apically, directed 



inwards towards medial line (PI. 6, fig. 339) .... sumatrana (p. 80) 



- Anterolateral processes of diaphragma evenly rounded apically and inwardly directed 



(e.g. PI. 8, fig. 347), or if not rounded then ventrally directed (PL 5, fig. 336) . 12 



12 Anterolateral process of diaphragma evenly rounded apically . . . . 13 



- Anterolateral process of diaphragma not rounded (PI. 5, fig. 336) argenticeps (p. 77) 



13 Genitalia as in Text-figs. 149-152 ...... grisearia (p. 84) 



- Genitalia not as in Text-figs. 149-152 . . . . . . . . 14 



14 Genitalia as in Text-figs. 143-146 ...... japonica (p. 80) 



- Genitalia not as in Text-figs. 143-146 ........ 15 



15 Socius (omitting apical spine) over twice as long as broad; apical processes of uncus 



not widely divergent (Text-fig. 133) ...... agna (p. 75) 



- Socius (omitting apical spine) less than twice as long as broad ; apical processes of 



uncus widely divergent (PI. 8, fig. 347) ..... simillima (p. 87) 



