15 
16 
ZOOLOGISCHE MEDEDEELINGEN = DEEL CL: 


Tubercles at upper border of movable finger 20—25, not conspi- 
cuously transversely vaulted on the proximal part, but longitudinally 
striated. 15 
Anterior margin of front faintly concave. Upper border of arm of 
cheliped ending in an obtuse angle, anterior border with a denticulate 
prominence near the distal end; inner surface of palm with a pro- 
minent, transverse crest; pectinated ridges running parallel to the 
oblique posterior margin of the upper surface of the palm; outer 
surface of immobile finger without longitudinal rim. 
Ses. erythrodactyla Wess '). 
Anterior margin of front widely but profoundly emarginate. Upper 
border of arm of cheliped terminating in an acute tooth, anterior 
border with a triangular spine; inner surface with a very short, 
eranulate, transverse crest of 6—7 granules (in ©); pectinated ridges 
running nearly parallel to the joint of the palm and the movable 
finger; proximal part of outer surface of immobile finger with a lon- 
gitudinal rim. Ses. bataviana de Man. 
Meropodites of penultimate pair of legs slender, about 3 times as 
long as broad. “Outer postfrontal lobes scarcely more than half as 
wide as inner ones, their anterior margin being continued downward 
toward the lower outer angle of the front” (Rathbun); width of front 
between the eyes not reaching to half the distance between external 
orbital angles. Near the upper border of the palm of the cheliped 
there are three longitudinally-oblique ridges, nearly parallel to the 
oblique posterior margin of the palm; upper border of movable finger 
with about 11 very small and low tubercles on the proximal half. 
Ses. pangauranensis Rathbun *). 
Meropodites of penultimate pair of legs broader, twice as long as 
broad. Tubercles at upper border of movable finger of cheliped num- 
bering. 13—15. 17 
1) The subspecies africana Ortmann is distinguished by the lesser development of the 
prominent transverse crest at the inner surface of the palm, by the presence of an obtuse den- 
tate lobe at the anterior (inner) border of the arm of the cheliped and by longer dactyli of the 
ambulatory legs, these dactyli being nearly as long as the preceding joints. 
2) Of this small species only the © is known; the ¢“ will perhaps present much more cha- 
racteristic features. On the whole it may be said, that it is very diflicult to insert the species 
of Miss Rathbun (described in the Proc. U. S. Nat. Museum, v. 47, 1914) in the present keys, 
as no figures have as yet been published. 
