Key to species of the T. bifurcus subgroup

1 Telopodite with a single femoral spine ......................................................................................................................... 2

1* Telopodite with a double femoral spine........................................................................................................................ 3

2 Lateral process of anterior coxal fold (alp) without an apical crest; mesal process of anterior coxal fold (amp) shorter than and as broad as alp, directed distad; femoral spine (fe) very long and slender .......... Thyropygus casjeekeli n. sp.

2* Lateral process of anterior coxal fold (alp), with a sharp crest on the posterior surface near the tip (Fig. 5 C, arrow); mesal process of anterior coxal fold (amp) almost as long as alp, straight, directed distad; femoral spine (fe) very long, slender, with an additional lamella at base (Fig 5 D, arrow) ................................ Thyropygus quadricuspis n. sp.

3 Lateral process of anterior coxal fold (alp) broader, terminating in a very short external spine and a very long internal one; mesal process of anterior coxal fold (amp) as long as alp; first femoral spine (fe 1) very short, pointed; second femoral spine (fe 2) very long, as long as tibial spine (ti); an additional lamella at both side of base of fe 2. ........ ............................................................................................................................... Thyropygus richardhoffmani n. sp.

3* Lateral process of anterior coxal fold (alp) slender, regularly curved, sickle-shaped ................................................. 4

4 Mesal margin of lateral process of anterior coxal fold (alp) simple, without a caudad spine or crest; mesal process of anterior coxal fold (amp) much shorter than lateral process (alp), curved, pointed ....................................................... ........................................................................................................................ Thyropygus enghoffi (Demange, 1989)

4* Mesal margin of lateral process of anterior coxal fold (alp) with a caudad small spine or crest ................................. 5

5 Mesal margin of lateral process of anterior coxal fold (alp) with a small caudad crest; mesal process of anterior coxal fold (amp) slightly shorter than alp, slightly sigmoid, pointed ......................... Thyropygus bifurcus (Demange, 1986)

5* Mesal margin of lateral process of anterior coxal fold (alp) with a short curved caudad spine; mesal process of anterior coxal fold (amp) as long as alp, straight ..................................................................... Thyropygus demangei n. sp.