DUTCH BORNEO-EXPEDITION. 143 



The ambulatory legs are as thin and slender as those 

 of Pal. Ritsemae^ but the terminal joints are a little 

 longer, measuring nearly one third ofthe pro- 

 podi, those of Pal. Ritsemae only one fourth. In the 

 adult male the third pair of legs exceed the antennal scales by 

 the length of their terminal joints, those of the female reach 

 only to their tip. The fourth and fifth pairs of legs of the 

 male extend as far as the third, but those of the fifth pair 

 in the female project with their dactyli beyond the antennal 

 scales. As has already been observed, the ambulatory legs 

 are about as slender as those of Pal. Ritsemae. So e. g. 

 the breadth of the propodi of the 5th pair measures in the 

 adult male only ^/gg — '/24 of their length, in the ova-bearing 

 females ^ac — ^'2-5 ^^ ^'^^ male of 47 mm. also ^\^- and in 

 the young female, which is 38 mm. long, even only ^/jg. 

 In the adult male and in the adult female the 

 dactyli of the third pair of legs are a little 

 longer, those ofthe fifth pair but little shorter 

 than one third of the length ofthe propodi. In 

 Pal. Ritsemae these joints are shorter in proportion to the 

 length of the propodi. 



Closely allied to Pal. sintangensis is Pal. (Eupal.) Idae 

 Heller, a species that has also been collected »auf Borneo" 

 (Heller, Sitzungsber. Akad. Wiss. Wien, Vol. 45, 1862, 

 p. 417). Pal. Idae, however, is an inhabitant of the Java 

 Sea (vide de Man, in: Zool. Jahrb. 1897, p. 767) and 

 may perhaps have been collected by Ida Pfeiffer in one 

 of the sea-ports of Borneo; as far as I know this species 

 is not yet known to live also in the rivers of that great 

 island. The eggs of Pal. Idae are therefore probably nu- 

 merous and small. This species attains a much larger size, 

 the carpus of the second pair of legs has a different form 

 and the difference in length between carpus and hand is 

 much greater than in our new species. 



The eggs of Pal. (Eupal.) sundaicus Heller are also 

 numerous and small, the ambulatory legs are less slender 

 and the second pair of legs present different characters. 



Notes from thie Leyden M!useu.in , Vol. !XX. 



