57 



I presunie, that this small specimen, taken at Kur Island near the Kei Islands, has been 

 livino - in the brook (that is said to be strong in the rainy season ] ) at the west coast of the 

 island, for the species of Tympanomerus seem to prefer brackish and fresh water, as far as is 

 known to me, and cannot be called strictly marine. 



Subfam. 'M a.crophthalminae 



The members of this group differ widely in outer appearance : the carapace may be 

 very broad, sometimes even twice as broad as long, and the eye-stalks are in some cases 

 greatly elongate, whereas in othcr instances the carapace is nearly quadrate and the ocular 

 peduncles are shorter than the front, which characters approach those of the Grapsidae. Yet 

 the present subfamily belongs to the Ocypodidae on account of the external maxillipeds being 

 slightly or not at all gaping, and among this latter family they are distinguished by the 

 depressed, generally not globose cephalothorax, the carapace being broader than long. the 

 antennulae transverse and separated by a narrow septum. 



Key to the genera : 

 i. Merus of external maxilliped shorter than ischium; flagellum thick, 

 articulatincr at antero-external an°[le of merus. Front deflexed. 

 Eye-stalks generally very long, sometimes reaching far beyond 



the external orbital angles 2 



Merus of external maxilliped as long as, or longer than, ischium, 

 flagellum more slender, at least the two terminal joints. Front 

 deflexed or horizontal 4 



2. A small gap between external maxilipeds, meri broader than long Macrophthalmus Latreille 

 A somewhat wider gap between external maxillipeds, meri about 



as broad as long 3 



3. Front at anterior margin measuring more than one-third of the 



distance between the external orbital angles, eyes reaching to 

 these outer angles. Merus of external maxilliped with a deep, 



diagonal sulcus Hemiplax Heller -) 



Front at anterior margin measuring less than one-third of the 

 distance between the external orbital angles, eyes not reaching 

 to these outer angles. Eye-stalks longer than front. . . . Euplax H. Milne-Edwards 



4. Lateral margins of carapace strongly divergent backward till the 



level of the bases of the penultimate pair of legs. Chelipeds, 

 even of d, extremely weak and small, much shorter than 

 walking legs. Merus of external maxilliped auriculate at its 



1) Max Weber. Introduct. et descr. de 1'exp. du "Siboga", 1902, p. 117 and p. 29 (with textfig.). 



2) This genus contains but a single species, H. hirtipcs Heller (Reise "Novara", Crust., 1865, p. 40, pi. 4, f. 3) that occurs 

 at New Zealand. 



S1B0GA-EXPEDITIE XXXIX c. 



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