Thelyphonidas in the British Museum. 121 



Carapace furnished ou each side with a 

 keel running forwards from the lateral 

 eyes. 



a 3 . Median eyes not separated hy an 

 upstanding- ridge ; hand in rf flat, 

 twice as wide as the femur, which 

 is long, slender, cylindrical, and 

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



Type pug nator (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 feniur, which is shorter 

 and thicker. 

 «'. The genital operculum in the P. 

 with its median area laterally 

 sulcate and deeply impressed in 

 the middle, its posterior border 



truncate and sinuate Typopeltis, g. nov. 



Type P. crucifer, Pocock. 

 b\ Genital operculum in the 9. 

 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 9. (? al- 

 ways) modified). 

 a 6 . With one ommatoid on each 



side of the anal segment. . Thelyphonus (Latr.), Thor. 

 Type caudatus (Linu.), Thor. 

 b c . With two ommatoids on each 



side of the anal segment. . Tetrabalias, Thor. 



Type seticauda (Dol.). 

 b a . Genital operculum in J with- 

 out a fine median groove ; the 

 second ventral plate without 

 a spine (tarsi of 9 unmodi- 

 fied). 



a 1 . Coxal apophysis of chela 

 longer, thinner, and 

 armed internally with a 

 distinct tooth Uroproctus, g. nov. 



. Type assanwisis (Stol.). 



b 1 . Coxal apophysis of chela 

 shorter, stouter, and 

 not armed internally 



with a tooth Mastigoproctus, g. nov. 



T yP e yiganteus (Lucas). 



