26 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



14a. Carpus armed on anterior margin with strong teeth or tuber- 

 cles 15 



14b. Carpus not armed with strong teeth or tubercles. ... 23 



15a. Carpus with wide-set conical tubercles on anterior margin; 

 manus with a thick fringe of hairs on outer margin; fingers 

 dissimilar in the two chelipeds 16 



15b. Carpus with strong teeth on anterior margin; manus without 



a thick fringe of hairs; fingers not distinctly dissimilar. . . 17 



16a. Carapace covered with short transverse plications; front with 

 a fringe of hairs; posterior margin of merus of walking legs 

 1 and 2 with 2 or 3 distal spines hirtipes 



16b. Carapace nearly smooth; no fringe of hair on front; posterior 

 margin of merus of walking legs without spines. 



nigrunguiculatus 



1 7a. Front not strongly deflexed ; carapace covered with pubes- 

 cence, with large tubercles anteriorly ; carpus at least twice as 

 long as wide (south-temperate species) 18 



1 7b. Front usually strongly deflexed ; carapace not covered with 

 pubescence, without anterior tubercles, but anterior regions 

 and grooves defining them strongly accentuated ; carpus not 

 more than \y2 times as long as wide (tropical species). . . 19 



18a. Lobes of front about equal in breadth; about proximal ^ 

 of anterior margin of carpus produced into a strongly project- 

 ing lobe, its edge cut into about 8 uneven, serrate-edged 

 teeth; gape of fingers naked tuberculatus 



18b. Median lobe of front much broader than lateral lobes; carpus 

 with 2 or 3 strong, uneven, serrate teeth on anterior margin 

 followed by a number of denticles ; gape of fingers with a short 

 pubescence tuberculosus 



19a. Telson of abdomen with 5 plates; outer orbital angle produced 

 into a distinct tooth hians 



19b. Telson of abdomen with 7 plates; postorbital angle not 



strongly produced 20 



20a. Manus with 2 longitudinal crests on dorsal surface and a 



heavy, rounded crest along outer margin 21 



