318 Mr. R. I. Pocock on new Genera 
compares it, entirely forgetting apparently the possibility of 
the existence of Lecomtet. Asa matter of fact, the characters 
that are given to distinguish 12-dentatus from 7-dentatus, 1. e. 
africanus, are precisely those which one would pick out as 
distinguishing Lecomted from africanus. So that it is only 
reasonable to suppose that 12-dentatus is a synonym of 
Lecomte’, and such I shall consider it to be until evidence to 
the contrary is forthcoming. 
Opisthocentrus Lecomtei (Lucas). 
Ischnurus Lecomte?, Lucas in Thomson’s Arch. Ent. ii. p. 428 (1858). 
Opisthacanthus duodecim-dentatus, Karsch, Berl. ent. Zeits. xxx. p. 79 
(1886). 
This species, which like africanus is a West-African form, 
is unknown to me. Nevertheless there can, I think, be little 
doubt that the synonymy given above is correct (cf. supra sub 
O. africanus). 
This species differs from the preceding, africanus, as well as 
from the following validus, in having 10-12 pectinal teeth 
and a smooth carapace; possibly also in other characters 
which will be pointed out when specimens fall into competent 
hands for examination. 
Opisthocentrus validus (‘Thor.). 
Opisthacanthus validus, Thor. Act. Soc. Ital. p. 248 (1877). 
Opisthacanthus capensis, id. ibid. 
Hormurus diremptus, Karsch, Mitth. Munch. ent. Ver. 1879, p. 129. 
Hormurus asiaticus, Keyserling, Die Arachn. Austral., Scorpiones, p. 24, 
pl. iii. fig. 1 (1885). 
This species is evidently not uncommon in South Africa. 
Thorell’s validus and Karsch’s diremptus were from Caffraria, 
and the former author’s var. capensis from the Cape of Good 
Hope. The British Museum has examples from 8. Africa 
(Drs. Smith and Quain), Port Elizabeth (Messrs, Leslie and 
Drege), King Williamstown (Mr. Trevelyan}, Kast London 
and Natal (Jr. Howlett and Prof. Lankester), as well as two 
others which are without history. One of these latter, a 
young form, agrees exactly with Karsch’s description of 
H. divemptus. As for Keyserling’s H. asdaticus, there can 
be no doubt that it is the same species, though the vague 
locality, East Indies, is in all probability erroneous. 
This species varies a good deal in the colouring of its 
legs, the compression and denticular armature of its poison- 
vesicle, &e., and it is possible that it may ultimately be 
capable of being split up into several local forms. 
