377 



finger, tip of the latter rather obtuse. The large cheliped of the female agrees with that of 

 the male, but the merus is a little less broad in proportion to its length and the length of the 

 chela is onlj' one-third that of the body. 



Merus of the small cheliped of the male a little less broad in regard to its length than 

 that of the larger, outer face 2,5-times as long as broad; the upper margin ends in a pointed 

 tooth, but the inner is unarmed. The carpus and the chela, which also shows the Balaeiiiceps- 

 form, closely resemble those of A. bidens, but the palm bears no trace of a transverse groove 

 near the dactylus and the leaf-shaped, upper face of this finger is comparatively broader 

 than in the male of A. bidens. In the male of A. bidcns from Stat. 133 the length of this 

 upper part of the dactylus is in proportion to its width as 26 : 10, in A. bicostaius, however, 

 as 18 : 10. In A. bidens this upper face of the dactylus appears convex transversely, but in 

 A. bicostatus rather flattened. 



The small cheliped of the female resembles that of A. bidens, the conical fingers are 

 but little shorter than the palm, that presents no trace of a transverse groove near the dactylus ; 

 the upper (inner) face of the chela is hairy, as in the male. 



In the right leg of the second pair of the male (from Buton-strait) the carpal segments 

 are 1,2 mm., 1,45 mm., 0,56 mm., 0,68 mm. and 0,8 mm. long, the chela is 1,32 mm. long 

 (palm 0,54 mm., fingers 0,78 mm.); in the left leg these numbers are, in the same succession, 

 1,2 mm., 1,3 mm., 0,56 mm., 0,66 mm. and 0,76 mm., the chela just as long as in the other leg. 

 The second segment appears little longer than the first, in the right leg the difference is larger 

 than in the left. Ischium of 3>'i legs with a strong, movable spine. Merus 4, 5 -times as long as 

 wide in the middle, with a strong acute tooth near the far end of the posterior margin ; carpus 

 about half as long as the merus, posterior margin ending in an acute tooth, anterior with some 

 long setae. Propodus slender, with 6 — 8 spines on the posterior margin and some others near 

 the margin on the outer face; anterior margin setose, with 2 or 3 long and strong setae at 

 the distal extremity. Dactylus slender, simple. 



Fourth legs as the 3''^, but the merus comparatively less broad. 



The distal third part of the dactylus of the large cheliped and the tip of the other 

 finger are violet; the fingers of the small cheliped of the male are marked with violet spots 

 at their margins, while in the female these fingers are violet on the distal third part with 

 paler tips. 



Length of the male 18,5 mm., of the female 20,5 mm.; the smallest, egg-bearing specimen 

 is 14,5 mm. long. 



3 1 . Alpheus insignis Heller. 



Alpheus insignis C. Heller, in: Sitzungsber. Kais. Akad. Wiss. Wien. Bd. XLIV, 1861, p. 269, 



Taf. Ill, figg. 17, 18. 

 Alpheus insignis J. G. de Man, in: Abhandl. Senckenb. Naturf. Geselis. XXV, 1902, p. 864, 



Taf. XXVI, iigg. 60, 60a, 60 b. 

 Alp/u'us insignis H. Coutiere, Alpheidae Maid, and Laccad. Archip. 1905, p. 899. 



Stat. 78. June lo/ii. Lumu-Lumu-shoal, Borneo-bank. Reef, i male and i female without eggs. 



245 



