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with similar feeding habits {Uca, Macrophthalmus, Euplax a. o.), where the fingers are spooned 

 and ornamented with stiff hairs at the tip. 



Dotilla (de Haan) Stimpson emend. 



1833. Doto de Haan. Faun. Japon., Crust., 1833, p. 24 (praeocc). 

 1858. Dotilla Stimpson. Proc. Acad. Nat. Sc. Philadelphia, 1858, p. 98. 



The genus is widely distributed throughout the Indian region, from the Red Sea and 

 the east coast of Africa to the Moluccas. It does not seem, however, to be represented in the 

 Pacific Ocean. Each species is somewhat restricted in its range, so D. fenestrata is characteristic 

 to the east coast of Africa, ranging from Zanzibar and Mocambique to the Cape of Good Hope, 

 IJ. sulcata inhabits the Red Sea and neighbouring coasts, D. ó/anfordi, órevitarsis, clepsydro- 

 dactylus, intermedia and especially D. myctiroides occur on the coasts of British India etc. 

 One single species has been caught by the "Siboga". 



I prepared the following key to the rather numerous (11) species: 



1 . Tympana present on the sternum 2 



No tympana on the sternum 3 



2. Carapace at least as long as broad. Chelipeds 3 — 4 times 



as long as the carapace and much longer than the 

 walking legs, carpopodite of cheliped very much elong- 

 ated, about as long as the carapace. Species of British 



India D. myctiroides H. Milne-Edwards *) 



Chelipeds about twice the length of the carapace. Fingers 

 longer than palm, both with a larger tooth in the 

 middle. Species of East Africa D. fenestrata Hilgendorf 2 ) 



3. Meropodites of walking legs dilated, only little more than 



twice as long as broad 4 



Meropodites of walking legs not dilated, distinctly more 

 than twice as long as broad 6 



4. Dactyliof walking legs as long as, or shorter than, propodites 5 

 Dactyli of walking legs distinctly longer than propodites. 



Tympana on the legs strongly marked, occupying the 

 entire width and about three-fourths the length of the 

 meropodites. Carapace very thick, about as high as 

 long. Epistome reduced. Merus of external maxillipeds 

 very large, broader than long, and about three times 

 as large as the ischium D. sigillorum Rathbun 3 ) 



& 



1) Ann. Sc. Nat. (3) t. 18, 1852, p. 152, pi. 4, f. 24. Synonymy and description: ALCOCK, 1. c. p. 368. Both Henderson 

 (Transact. Linn. Soc. London (2) v. 5. 1893, p. 390) and Lanchester (Proc. Zool. Soc. London, 1900, p. 760, pi. 47. f. 14) refer this 

 species to the genus Scopimera, but the abdomen of both sexes, as figured by the latter author, is absolutely DotillaAhke. 



2) V. D. Decken's Reisen in Ost-Afrika, Bd 3, I., 1869, p. 85, pi. 3, f- 5- Synonymy: Stebbing, Ann. S. Afr. Mus., v. 6, 

 prt 4, 1910, p. 329. 



3) Proc. ü. S. Nat. Mus., v. 47, 1914, p. 83. One single specimen (9) was found at Sandakan Bay (Borneo). 



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