407 



In an ova-bearing female, long 23,5 mm., in which the rostrum resembles that of the 

 desenbed male, the proportion between the length of the smaller chela and the height of the 

 palm is 4,2 and the fingers are but very little shorter than the palm. In this specimen the 

 prominence at either side of the rostrum is less conspicuous than in the described male. 



Only in three other specimens the rostrum agrees with that of the described male being 

 flattened above, in the 14 other specimens the rostrum is not flattened, but rounded 

 above, like in A. chiragricus\ these specimens, hovvever, for the rest fully agree with the 

 preceding, especially as regards the characteristic form and colouration of the large chela, so 

 that they are referred to the same variety, which therefore may bear the name of variabilis. 

 In these specimens the prominence at either side of the rostrum is also less pronounced or 

 wanting at all. 



The carpal segments of the 2 nd legs are, in the typical male with flattened rostrum, 

 2,26 mm., 1,1 mm., 0,56 mm., 0,541:1111. and 0,92 mm. long, the second segment is about 3- 

 times as long as thick; chela 1,66 mm. long (palm 0,8 mm., fingers 0,86 mm.). The second 

 segment is only half as long as the first, while in the typical bis-incisus and in the two 

 varieties of Coutière, the second segment appears comparatively longer. 



The following legs resemble those of A. chiragricus. Merus of 3 rd legs 5,3-times as long 

 as broad in the middle; the propodus that measures little more than two-thirds of the merus, 

 appears 6,5-times as long as broad and bears 7 spines along its posterior margin. Dactylus 

 almost half as long as the propodus. 



Characteristic is the colouration of the large chela, which is marked with an ochraceous 

 spot on the posterior part of the quadrangular depression on the outer surface of the palm 

 and often the notches of the upper and the lower border of the palm appear also ochraceous ; 

 the fingers are sea-green, but their tips are violet. 



f50. Alp/ieus proseuchii'us de Man. 



J. G. DE RIAN, in: Notes from the Leyden Museum, Vol. XXX, 1908, p. ui. 



Stat. 114. July 8. o°58'.5 N., I22°55'E. Kwandang-bay-entrance. 75 m. Hard sand, very fine. 



1 adult egg-bearing female and 2 younger specimens. 

 Stat. 116. July 12. o°58'.5 N., I22°42'.5 E. West of Kwandang-bay-entrance. 72 m. Fine sand 



with mud. 1 adult egg-bearing female and 2 younger specimens. 



Closely related to A. pareitchirus Cout. 



Length of the largest specimen, the egg-bearing female from Stat. 114, 25 mm., cephalo- 

 thorax, rostrum included, 8,5 mm. long, one-third of the whole length: this species attains a 

 much larger size than A. pareuchirus. Carapace slightly convex longitudinally, smooth and 

 gdabrous. Rostrum as in A. bis-incisus de Haan, acute and narrow, reachiiiCT almost to the end of 



O 'O 



i st antennular article, in younger specimens a little shorter and passing at the base of the eye- 

 hoods, somewhat behind the corneae, into the surface of the carapace. The rostrum is flattened 

 above, nar r o w-t r iangu la r, about 3-times as long as broad at base, the slightly-concave, 

 lateral margins are rather sharp and somewhat overhang the deep orbito-rostral grooves, the 

 outer, orbital maro;ins of which are rounded. The lensfth of the rostrum is one-fourth that of 



2 7S 



