C. Warburton 275 
The pedipalps, which are above and slightly external to the “machoires” 
and just within the cheeks, are conical and three-jointed. Their chitinised 
base is contiguous to the epimeres of the first legs. The chelicerae are chelate 
and consist of a rod (tige) ending in two toothed processes, the inner of which 
is mobile. According to Dubreuilh and Beille (1895, p. 18) the dorsal edges 
of the chelicerae are in contact while their ventral edges are separated, so 
that there is between them and the hypostome a space, triangular in section, 
which is the mouth cavity. The chelicerae always act in alternation. 
Delafond and Bourguignon (Traite 'pratique, p. 37) give a very interesting 
account of the mode of action of the mouth-parts. First the palps are 
separated and their sharp extremities plunged into the integument, which they 
loosen by repeated attacks. Then the chelicerae come into play, breaking 
down the adhesions ‘‘between the corneous and mucous layers,” and acting 
alternately. Now the muscles which actuate them pass through a narrow 
orifice to the thorax, and this would result in pulling the left mandible to the 
right, and the right to the left. This is prevented by a small horny plate 
which separates the mandibles behind and turns on a fixed vertical axis. 
Adult male. The male differs from the female in the following respects. 
It is much smaller, measuring 200-235/z in length by 145-170/x in breadth, 
and the fourth pair of legs terminate, like the anterior legs, in ambulacra. 
The epimeres of the second pair of legs are forked at their extremity 1 , and 
the epimeres of legs 3 and 4 are not only fused together at each side, but 
the two pairs of epimeres are united by a transverse bar from the middle of 
which a chitinous structure in the form of an inverted Y proceeds backwards 
and constitutes the epiandrium or genital armature, for the genital aperture 
of the male lies between the fourth pair of legs, while the anus, as in the female, 
is terminal. 
The dorsal aspect presents three “plastrons” or “clairieres,” one on the 
notothorax and two on the notogaster. That on the notothorax is much 
larger than in the female, and is longer than broad. Those on the notogaster 
are small and subcircular and lie on either side of the posterior end of the 
abdomen. 
The immature stages. There appears to be no detailed account of the 
structure of any of the immature stages of S. scahiei. Munro thus describes 
the second nymphal or immature female stage (femelle pubere). 
“Length 220-250/z; breadth 170-200/x; rugose area (plastron) rectangular; 
dorsal scales numerous; bare area notogastric, small; notogastric spines 
twelve in number; third and fourth posterior legs ending in bristles; epimeres 
of anterior pairs of legs (? the second pair) forked. Tocostome and tocostomal 
hairs absent.” 
The first nymphal stage, according to Dubreuilh and Beille (p. 20) had 
Fiirstenberg maintains that in this species the epimeres of the second legs do not end freely 
but are joined by a transverse bar of chitin just anterior to that connecting the epiandrium with 
the epimeres of the posterior legs (Krdtzmilben, PI. I, fig. 8). 
