^„ Rostrum separated by shallow depressions from the orbits. 



//j Larger chela 4-times as long as high. Merus of 3'<i 



legs 7-times as long as wide, propodus i , 4-times as 



long as the carpus. Telson 4-times as long as the 



posterior margin is wide sp.de Man 



h„ Larger chela of the female 4-times as long as high. 



Merus of 3''^ legs 8,5-times as long as wide, propodus 



1,44-times as long as the carpus. Telson as in A. 



par alp heops ides, but 4,8-times as long as the posterior 



margin is wide tenuipes de Man 



Brevirostris group. 



«, Larger chela marked with a transverse groove near the base of the 



movable finger. 



b^ Fingers of smaller chela of the male at least one and a half as long 



as the palm. 



Cj Palm of smaller chela of the male longer than high, one and a 



half as long as high near the articulation of the fingers ; fingers 



gaping, one and a half as long as the palm, slender, tapering, 



the dactylus with two longitudinal ridges fringed with hairs and 



meeting not far fi-om the tip. Rostral carina hardly reaching to 



the base of the orbital hoods rapax Fabr. 



(Tg Palm of smaller chela of the male not longer than high (except in 



the variety atigustidigittis of A. brevirostris (Oliv.); dactylus of 



this chela not "Balaeniceps"-shaped. 



d^ Rostral carina reaching almost to the middle of the carapace. 



Fingers of the small chela of the male somewhat more than 



twice as long as the palm, gaping, excavate at the inner side, 



the dactylus widened at its base. 



^j Width or height of the dactylus of the small chela of the male, 



at its base, one-fourth of its length ; carpocerite reaching to 



the apex of 2"'^ antennular article brevirostris (Oliv.) 



(Vide J. G. DE Man, in: Mem. Soc. Zool. France, 1909, p. 153 and ft'., PI. VII, 

 Fig. 15, 16). 



e„ Width or height of the dactylus of the small chela of the male, 

 at its base, one-fifth of its length; carpocerite as long as 



the antennular peduncle brevirostris (Oliv.) var. angitstidigitus n. 



d„ Rostral carina hardly reaching to the base of the orbital hoods. 



e^ Fingfers of larg-er chela but a little shorter than the palm. 



Fingers of smaller chela of the male in adult specimens 3,5- 



190 



