’s RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 235 


3 Carapace smooth, sltining, hairless; lateral margins not toothed 
behind the external orbital angles; postfrontal lobes only indicated by 
very narrow and short grooves, rather sharp anteriorly. | Metasesarma. 
Carapace very uneven, covered (like the legs) with a dense fur; 
lak al margin toothed behind the external orbital angles; postfrontal 
lobes distinct, rounded off anteriorly, concealed beneath the general 
hairy coating. Clistocoeloma. 
A. Sesarma. 
Key to the subgenera: 
1 Lateral margins of carapace not dentate behind the external 
orbital angles, or at most with traces of teeth. 2 
Lateral margins of carapace always dentate behind the external 
orbital angles. 3 
2 Upper part of palm of chela either smooth or (in rare cases) 
with a single longitudinal pectinated crest. Holometopus. 
Upper part of palm with 2—3 transverse pectinated crests; 
superior border of movable finger mostly with a row of transverse 
tubercles. Parasesarma. 
3 Upper part of palm of chela nearly always without pectinated 
crest; such a crest is present in some cases, but always longi- 
tudinal. Sesarma 8.8. 
Upper part of palm of cheliped always with 2—3 transverse 
pectinated crests; superior border of movable finger with a longi- 
tudinal row of transverse tubercles. Chiromantes '). 
1. Holometopus. 
1 Postfrontal lobes very inconspicuous, upper border of the front 
being perfectly straight and only with a very narrow incision in 
1) This subgenus was first established by ‘de Man (1887) and afterwards (1895) called by 
him Perisesarma; Miss Rathbun however recently (1909) changed this name into Chiromantes. | 
could not make ont the reason of this, but the latter name has been used in 1848 bij Gistel 
(Naturgesch. d. Tierreichs, p. X, according to the ,,[ndex Zool.” of the Zoological Record 
1880—1900, 1902, p. 72, and Carus’ and Engelmann’s Biblioth. Zool., Bd 1, 1861, p. 250). 
As the paper of Gistel is often quoted by Miss Rathbun, it must be supposed that the name 
Chiromantes has been proposed by Gistel to receive a species of Perisesarma, 
: 
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