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1896. Leiolopliiis abbreviatus de Man. Zool. Jahrb., Syst., Bd 9, p. 359. 



1902. Liolophus abbreviatus de Man. Abhandl. Senckenb. Gesellsch., Bd 25, Heft 3, p. 544, 

 pi. 20, f. 13. 



1905. Leiolophus abbreviatus Lenz. Abhandl. Senckenb. Gesellsch., Bd 27, Heft 4, p. 373. 



1906. Percnon abbreviatum Rathbun. Bull. U. S. Fish Comm. for 1903, v. 23, prt 3, p. 842. 

 191 1. Percnon abbreihatuni Rathbun. Transact. Linn. Soc. London (2) v. 14, p. 242. 



Stat. 34. Labuan Pandan, west coast of Lombok. i 9- 



Stat. 79b. Kabala Dua, Borneo Bank, Macassar Strait, i (^ . 



Stat. 131. Karakelang, Talaut Islands. 2 cf, i 9- 



Stat. 133. Lirung, Talaut Islands, i (^ . 



Stat. 220. Binongka Island, south-east of Celebes, i (^ . 



Stat. 248. Tiur Island, between Kei Islands and Ceram. i cf. 



Thanks to de Man's researches (especially those of 1902) there is now no difficulty in 

 distinguishing between the common P . planissinium and the present species. 



The dorsally sulcata chelae, the absence of lateral teeth on the anterior margin of the 

 epistome, the smoothness of the pleural groove and the shape of the last segment of the 

 abdomen of the c? are all important features of /'. abbreviattuii, at least as understood by 

 DE Man, for the author has at different occasions alluded to the probable incorrectness of 

 Dana's figure. 



It is also worth of notice, that the chelae of the adult P. planissimiim are peculiarly 

 high and compressed, whereas they remain small and not dilated in P. abbreviatum. 



The species is apparently associated with the preceding throughout the whole Indo-Pacific 

 region, but is generally less abundant. 



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