204 ZOOLOGISCHE MEDEDEELINGEN — DEEL HI. 
The free margin of the front is more excavated in the middle, so 
that the median sinus is narrower and entirely concave in the subspecies, 
broader and straight in the middle parts in the type (textfig. 5). 
The projecting lobes on the front margin are provided each with an 
oval tubercle, on which nu- 
merous hairs are inserted, in 
the subspecies; in the type 
a. We observe mostly a group 
of three similar, but much 
smaller, tubercles on each 
lobe, though in other speci- 
mens these tubercles tend to 
fuse into one larger tubercle. 
The difference in size between 
the inner and the outer post- 
Magn. 2, frontal lobes is larger in the 
subspecies, owing to the fact, 
that the median groove, separating the inner lobes, is much narrower here 
than in the type. Finally the upper orbital border is nearly wholly : 
straight in the subspecies, but somewhat convex in the type. 
The “tympana’’, at either side of the penultimate segment of the - 
abdomen, on the sternum, are likewise present in the subspecies, though 
they are less distinct. 
As I have already remarked, the single Q which I took to represent 
the © of this subspecies, had lost its chelipeds, so that [ am unable to 
say, whether the numerous transverse tubercles on the back of the mo- 
bile finger are likewise present in the Q. But the fact, that in the same 
sample a young © of Ses. lafondi has been found, which in its carapace 
and in its ambulatory legs did not show any difference from the ©, 
presumed to be the © of the present subspecies crebrestriata, has raised 
in me the belief, that this subspecies indeed belongs to Ses. 
lafondi and represents the GG, so long sought for, of this 
species. We are obliged, then, to suppose that the longitudinal keel 
running along the upper border of the mobile finger in Ses. lafondi, and 
the granulated row.along the upper margin of the palm, are merely sexual 
characters, and are replaced in the co respectively by a transversely-. 
milled crest, consisting of about 90 transverse tubercles, and by a pec- 
tinated, not granulated, crest at the palm; further, that the transverse 
row of granules at the inner surface of the palm is feebly developed in 
the o, but entirely absent in ‘the ©. 
As to the first supposition, in the young © before me, undoubtedly 
~ 
Fig. 5. 
d. Sesarma taeniolata crebrestriata 
b. Ses. taeniolata typ. 
