Key to pupae of 10 cytoforms in the S. ceylonicum group in Thailand *

(Fig. 11)

1 Cocoon with distinct anterodorsal projection .......................................................................... inthanonense

- Cocoon without distinct anterodorsal projection, although slight bulge may be present............................2

2 Terminal hooks with smooth outer margins.................................................................................................3

- Terminal hooks wider than high, with crenulated or serrated outer margins...............................................4

3 Gill (Fig. 11 A) with stalk of dorsal triplet thinner than that of middle triplet ................................. asakoae

- Gill (Fig. 11 I) with stalk of dorsal triplet as thick as that of middle triplet............................... nr. sheilae 3

4 Gill with angle formed by stalks of ventral pair and dorsal triplet more than 90 degrees when viewed later- ally (Fig. 11 G) ...................................................................................................................... trangense n. sp.

- Gill (Fig. 11 B–F, H) with angle formed by stalks of ventral pair and dorsal triplet 90 degrees or less when viewed laterally............................................................................................................................................5

5 Gill (Fig. 11 D) with angle formed by stalks of ventral pair and dorsal triplet about 60 degrees when viewed laterally........................................................................................................................ nr. asakoae 3

- Gill (Fig. 11 B, C, E, F, H) with angle formed by stalks of ventral pair and dorsal triplet about 90 degrees when viewed laterally..................................................................................................................................6

6 Anterodorsal margin of cocoon somewhat produced anteriorly...................................... doisaketense n. sp.

- Anterodorsal margin of cocoon not produced anteriorly.............................................................................7

7 Gill (Fig. 11 B) with common basal stalk longer than stalk of middle triplet ........................ curtatum n. sp.

- Gill (Fig. 11 C, E, F) with common basal stalk shorter than stalk of middle triplet.....................................8

8 Gill (Fig. 11 F) with dorsal and middle groups composed of 1 individual and 2 paired filaments on stalk of moderate length ................................................................................................................................. sheilae

- Gill (Fig. 11 C, E) with dorsal and middle groups composed of 3 filaments arising close together............9

9 Gill (Fig. 11 C) with stalk of dorsal triplet thinner than that of middle triplet ......................... nr. asakoae 2

- Gill (Fig. 11 E) with stalk of dorsal triplet as thick as that of middle triplet............................ nr. asakoae 4