Key to species of the induratus subgroup

1 Anterior coxal fold (ac) distally with one process (Figs 3 A, 4A, 7A, 8A).......................................... 2

- Anterior coxal fold (ac) distally with two distinct processes (Figs 1 A, 2A, 5A, 6A).................................. 5

2 Anterior coxal fold (ac) apically bent abruptly mesad, with an acute narrowed, slender tip (Fig. 3 A)............................................................................................... Thyropygus resimus Attems, 1938

- Anterior coxal fold terminating in a relatively broad, rounded process............................................ 3

3 Telopodite distally to femoral spine (fe) with a relatively large, broad, rounded lobe (lo); ac distolaterally rounded, distomesally produced in distad rounded lobe (Figs. 7 A, C).................................. Thyropygus laterolobatus n. sp.

- Telopodite distally to fe without a relatively large, broad, round lobe (lo).......................................... 4

4 Femoral spine (fe) relatively long, originating from mesal part of the telopodite ‘knee’, curving rearwards and closely appressed to telopodite shaft; tip of ac a broadly rounded lobe pointing disto-mesad (Fig. 4 C)................................................................................................. Thyropygus siamensis Verhoeff, 1938

- Femoral spine (fe) short, slender, curving almost in a horizontal plane, at right angles to the telopodite shaft; distal, disto-mesad lobe of ac relatively narrow (Fig. 8 C).......................................... .. Thyropygus macrosiamensis n. sp.

5 Telopodite distally to fe with a relatively large, broad, round lobe (lo); anterior coxal fold (ac) rounded distolaterally, mesally produced into distad, pointed process with a smaller accessory process on its lateral side (Figs. 6 A, C).................................................................................................. Thyropygus dormiens n. sp.

- Telopodite distally to fe without a large, broad, round lobe (lo)................................................. 6

6 Anterior coxal fold (ac) distally with two acuminate processes, the outer shorter and smaller than the inner one; femoral spine (fe) relatively long, very distinctly crenulated along outer curvature (Figs. 5 A–C, E).. Thyropygus uncinatus (Demange, 1961)

- Anterior coxal fold (ac) distally with two processes, the outer forming a slender, sharp spine, curving mesad, the inner broadly rounded, flattened, transparent, flexible; ac laterally very thick in posterior view.................................. 7

7 Paracoxites (px) extremely high; male body diameter 10.2–14.3 mm (Fig. 1 A)......... Thyropygus induratus Attems, 1936

- Paracoxites (px) high (but not extremely high); male body diameter 5.6–6.5 mm (Fig. 2 A)....................................................................................................... Thyropygus quietus Attems, 1938