ThelyphonidEe in the British Museum. 121 



Carapace furnislied on each side with a 

 keel ruuning forwards from the lateral 

 eyes. 



d^. Median eyes not separated by an 

 upstanding ridge ; hand in c? flat, 

 twice as wide as the femur, which 

 is long, slender, cylindrical, and 

 about twice as long as the tibia . . Mimoscorpius, g. nov. 



TyT^e pu(/nato)- (Butl.), 



b^. Median eyes separated by a distinct 



elevated ridge ; hand in both sexes 



strongly convex, subcylindrical, 



and at most only a little wider 



than the femm*, which is shorter 



and thicker. 



a^. The genital operculum in the 2 



with its median area laterally 



sulcate and deeply impressed in 



the middle, its posterior border 



truncate and sinuate Ti/pnpeltis, g. nov. 



Type P. crucifer, Pocock. 

 6*. Genital operculum in the 5 

 without a deep median impres- 

 sion ; its posterior border con- 

 vexly rounded. 

 a^. Genital operculum in the c? 

 large, with a deep narrow 

 median groove, which ter- 

 minates behind in a short 

 transverse impression ; a spine 

 on the second ventral plate 

 (tarsi of first leg in 5 (? al- 

 ways) modified). 

 a*. With one ommatoid on each 



side of the anal segment. . Thehjphonus (Latr.), Tlior. 

 Type caudatus (Linn.), Thor. 

 b''. With two ommatoids on each 



side of the anal segment. . Tetrabalius, Thor. 



Type seticauda (Dol.). 

 i\ Genital operculum in J with- 

 out a fine median groove ; the 

 second ventral plate without 

 a spine (tarsi of § unmodi- 

 fied). 



a' . Coxal apophysis of chela 

 longer, thinner, and 

 armed internally with a 



distinct tooth Uroproctus, g. nov. 



Type assamensis (Stol.). 

 b''. Coxal apophysis of chela 

 shorter, stouter, and 

 not armed internally 



with a tooth Mastigoproctiis, g. nov. 



Type yiganteus (Lucas). 



