139 



third and the fourth legs being devoid of spinules on their posterior margin and by another 

 species that could not be determined with certainty, because the legs of the first pair are missing, 

 but that probably ought to be referred to Aut. dolichognatha or Aut. Gardineri. 



Four species are at present known to inhabit the Indopacific region: i° Aut. dolicho 

 gnatha de Man, observed in the Bay of Batavia, at Penang and at Djibouti, 2 Aut. Gardiueri 

 Cout., known both from the Western Indian Ocean and from the Pacific (Kingsmill Islands) 

 so that this species certainly will prove to occur also in the East Indian Archipelago ; 3 Aut 

 Salomoni Coüt., a species still only taken at Chagos, Salomon Island and 4 the new Aut 

 anacantJiopus, that occurs in the East Indian Archipelago. One species, Aut. Talismani Cout. 

 occurs at the Azores and another, Aut. Evermanni, has been recorded by Miss Rathbun from 

 Porto Rico ; the latter species, finally, is represented in the Bay of Panama by Aut. rugosa Cout. 



The species of this genus are living in shallow water, the greatest depth at which this 

 genus has been observed, being 137 fathoms, but this species, Aut. Evermanni, was also taken 

 at 12 to 18 fathoms. 



Key to the species of the genus Automate. 



a x Rostrum very small, triangular, acute or a little larger, obtuse, but 

 never reaching beyond the frontal margin of the carapace. Scale 

 of the scaphocerite shorter than the median antennular article. 

 ö 1 Rostrum very small, triangular, more or less acute. 



c x Carpocerite slightly longer than the antennular peduncle. Scapho- 

 cerite not yet reaching to the middle of the second article ; 

 visible part of basal article clearly shorter than the eye-peduncles. 

 Second carpal segment of second legs one and a half as long 

 as the first. Propodus of the third legs armed with spinules on 



its posterior margin dolichognatha de Man 



(J. G. de Man, in: Archiv fïir Naturg. 53. Jahrg. 1888, p. 529, Taf. XXII, Fig. 5). 



c % Carpocerite slightly longer than the antennular peduncle, scale 

 of the scaphocerite reaching two-thirds the length of the second 

 article of the antennular peduncle ; visible part of basal article 

 distinctly longer than the eye-peduncles. Second antennular article 

 one-fourth longer than the visible part of the first. No spinules 

 on the posterior margin of the propodus of third legs . . . anacantJiopus de Man 



c z Carpocerite a little longer than the antennular peduncle, scapho- 

 cerite in adults reaching two-thirds the length of second anten- 

 nular article-, visible part of basal article distinctly longer than 

 the eye-peduncles. Second carpal segment of second legs 3- or 

 4-times as long as the first. Proportion between length and 



heisht of the larsj-e chela in the female more than 2 . . . Evermanni Rathb. 

 (M. J. RATHBUN, in: U.S. Fish Commission Bulletin for 1900, Vol. 2, Wash. 

 1901, p. 112, Fig. 22). 



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