1898.] A. Alcock — Carcinological Fauna of India. 165 



Chlorodopsis A. Milne Edwards. 



Chlorodopsis, A. Milne Edwards, Nouv. Archiv. du Mus. IX. 1873, p. 227. 

 ? Pilodius, (part) Dana, U. S. Expl. Exp. Crust, pt. I. p. 217. 



Carapace flat, more or less hexagonal, the regions well delimited 

 and well areolated, the areolae being granular- or hairy, or both. 



Fronto-orbital border about two-thirds the greatest breadth of the 

 carapace. Front bilobed, the outer angle of each lobe usually well 

 denned and forming a distinct little lobule ; its breadth is about a third 

 the greatest breadth of the carapace. 



Antero-lateral border almost always cut into four teeth. Postero- 

 lateral border commonly a little longer than the antero-lateral. 



Orbital border with the three grooves or notches very distinct. 



Basal antennal joint large, extending up between the front and the 

 orbit, the outer angle being prolonged into the orbital hiatus. 



Anterior edge of merus of external maxillipeds almost transverse. 



Chelipeds either unequal or subequal, their length being generally 

 under twice the length of the carapace ; the arm short and not project- 

 ing very much beyond the carapace. 



Fingers strong, arched, broadened and hollowed at tip, but not so 

 hoof-like as Chlorodius. 



Legs dorsally almost always hairy and spinous. 



Abdomen of male 5-jointed. 



Chlorodopsis is distinguished from Chlorodius and Phymodius, ( 1) by 

 the prolongation into the orbital hiatus of the outer angle of the basal 

 joint of the antenna, and (2) by the granular and hairy or furry carapace. 



Key to the Indian species of Chlorodopsis. 



I. The entire carapace cut into strongly-convex, isolated 

 areolae, the surface of which is uniformly covered with 

 pearly granules : the deep smooth grooves between the 

 areolae, and the spaces between the granules, covered 



with a dense, dark, extremely short fur C. areolata. 



II. Only the anterior f to f of the carapace areolated : three 



or four of the lobules just inside the antero lateral 



border either bear spines or are themselves spine-like : — 



L Sculpture of carapace and legs almost concealed 



by bristles and long hairs : — 



1. Posterior fourth of carapace slightly con- 

 cave; chelipeds rather slender, little unequal, 

 the black colouration of the thumb hardly 

 involves the hand at all : — 

 a. Antero-lateral margin armed with four 

 large spines (not including the orbital 

 aogley C. pilwnnoides. 



