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

Published as part of Jitklang, Sanae, Kuvangkadilok, Chaliow, Baimai, Visut, Takaoka, Hiroyuki & Adler, Peter H., 2008, Cytogenetics and morphotaxonomy of the Simulium (Gomphostilbia) ceylonicum species group (Diptera: Simuliidae) in Thailand, pp. 1-28 in Zootaxa 1917 on page 24, DOI: 10.5281/zenodo.184626