62 Records of the Indian Museum. Pore Xie 
by no means unlikely that ultimately these African and Burmese 
forms will have to be separated under distinct generic names. It 
may be pointed out here that no two species, either of Hypoctonus 
or Labochirus as redefined, have ever been found together; but 
that several localities are known in which both genera are repre- 
sented by a single species. 
The keeled group can be split into three sections :—one in 
which the tibial apophysis of the male is strongly modified as in 
the Oriental species of the keelless group, one in which the hand is 
strongly modified, and one in which both tibial apophysis and hand 
are unmodified in the male and resemble more or less closely those 
of the female. The first, which includes only one genus, Typopeltis, 
may conceivably have been derived from the keelless group by the 
development of keels, and not ffom genera with keels and with the 
tibial apophysis of the male unmodified, as is here assumed. No 
proof is available for either hypotheses All species of the genus 
Typopeltis, however, are stated by Kraepelin to have tibial spurs on 
all three pairs of walking legs, not on the last one or two pairs 
only asin the keelless genera The spurs of Mimoscorpius, the only 
genus in which the hand is strongly modified, have not yet been des- 
cribed. In the larger genera, at least, of the section of the keeled 
group with unmodified or almost unmodified hands and tibial apo- 
physes in the male, the number of legs with tibial spurs is vaiable. 
The most primitive genus of the last-mentioned section of the 
keeled group appears to be the American Mastigopbroctus, in which, 
according to Kraepelin, the sexes are scarcely distinguishable 
superficially. In all Oriental genera, except Uroproctus, the genital 
sternum of the male has a strong median groove, and the nosterior 
margin of the following segment bears a strong median tubercle. 
Uvoproctus differs, however, from Mastegoproctus in having the 
tibial apophvsis of the male markedly slenderer than that of the 
female, and differs from this and from all other genera of the group 
in the presence of atooth on the inner side of the gnathobase of the 
arm. Thethree remaining genera, Thelyphonus, Abalius and Tetra- 
balius, are distinguished from one another sol ly by the number of 
vitreous spots on the third caudal segment. Nothing whatever is 
known as to the function of these spots!: and their taxonomic 
significance apnears to me to be equally uncertain. Provisionally, 
however, the distinctions which they afford may continue to be 
regarded as generic. 
The genera of Thelyphonidae may now be redefined thus :— 
‘Keels between median and lateral eyes almost 
always absent, never very strong; tibial apo- 
physis of male strongly modified in Oriental 
I. genera mate Sct ser ase 
Well developed keels always present between 
| median and lateral eyes; tibial apophysis of 
male often unmodified - dae 
is) 

! See Borner, 1904, pp. 25-26. Concerning improbability of their being 
uminous organs see Gravely, 19150, p. 523. 
