THE CANCROID CRABS OF AMERICA 



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J2. Antero-lateral regions, chelipeds and legs 

 spinulous or sharply granulous. Size 

 small. Antero-lateral margin shorter 

 than postero-lateral, with either second 

 or fifth tooth or both reduced or wanting. 

 Basal antennal article not reaching or 

 barely reaching the prolongation from 



the front Micropanope, p. 426. 



H2. Frontal and antero-lateral regions relatively 

 smooth, never spinulous or sharply 

 granulous. 

 J^ Length and breadth of carapace subequal. 

 Size small. Front broad, truncate. 



Metopocarcinus, p. 318. 

 J2. Breadth exceeding length of carapace. 

 Third to fifth segments of male abdomen 

 fused. 

 K^ Only four antero-lateral teeth includ- 

 ing orbital angle. Carapace very 

 convex from front to back. Front 

 truncate. Chelae elongate. 



Tetraxanthus, p. 458. 

 K^. Five antero-lateral teeth. 



L'. Antero-lateral teeth small, thick, 

 widely separated. A few 

 smooth transverse ridges on 

 antero-lateral and epigastric 

 regions. Legs thickly hairy. 



Chlorodiella, p. 462. 

 L2. Antero-lateral teeth broad, flat, 

 the first and second more or 

 less fused. 

 M^ Third segment of male abdo- 

 men not reaching coxae of 

 legs of last pair. Cara- 

 pace subquadrate, broad 

 behind, front truncate. 

 Rhithropanopeus, p. 455. 

 M2. Third segment of male abdo- 

 men reaching coxae of legs 

 of last pair. Carapace nar- 

 rower behind. 

 N'. Carapace crossed by bro- 

 ken, transverse, raised, 

 granulated lines on an- 

 terior half. Front 

 nearly transverse, not 

 advanced. First and 

 second antero-lateral 

 teeth partially fused. 

 Panopeus, p. 333. 

 N^. Carapace narrow, not 

 crossed by transverse 

 raised Unes. 



