122 



TRAVELS AMONGST THE GREAT ANDES. 



punctulated and biit slightly convex near to the frontal and anterior margin ; 

 the mesogastric and cervical sutures are faintly defined ; the antero-lateral 

 margins are regularly and strongly arcuated, and are granulated rather than 

 denticulated. The front is deflexed, less tlian 1 the width of the carapace, 

 and its anterior margin is sinuated, and posterior to it there is sometimes a 

 transverse elevation, which is indistinctly granulated (see Fig. A). The orbital 

 margins are without fissures, and are rather indistinctly granulated. The ptery- 

 gostouiian regions are nearly smooth. The eye pi-duncles are short, and not 



PSEUDOTHELPHUSA MACROPA, M. EDWARDS. 



PSKUPOTHELPHUSA MACKOPA, VAK. PLANA, S. I. SMITH (?). 



very stout, and do not quite till the orbital cavities. Tlie exterior maxilli- 

 pedes are punctulated and are of the form figured by Milne Edwards as 

 characteristic of P. macrojm. The chelipedes are small and unequal, the 

 merus in the larger (left) chelipede is short, trigonous, scarcely reaching 

 beyond the antero-lateral margins of the carapace ; its anterior margin is 

 armed with small, somewhat triangular teeth, its upper surface has the 

 smooth, oval depression (very slightly indicated) which is referred to by 

 Milne Edwards in his description of P. macrojxo ; the carpus has an acute 

 spine on the interior margin ; the palm is slightl}' convex, rounded above, 

 about as long as the merus and finely gramilated, fingers about as long as the 

 palm, with the apices slightly incurved, acute, and the interior nuirgins armed 

 with regular and rather small teeth. In the smaller chelijiede the palm is 



