21S A. Alcoek — Carcinological Fauna of India. [No. 1, 



The crests of the endostome, defining the expiratory canals, are 

 well developed and the canals are closed in below by the foliaceous 

 process of the 1st maxillipeds : the anterior edge of the merus of the 

 rather slender external maxillipeds is not notched. 



The chelipeds are long and very massive and are sub-equal or not 

 very unequal in both sexes : the arm usually projects a long way beyond 

 the carapace, and has its anterior edge sharp and crest-like and serrate : 

 the fingers have usually a thiu and sharp cutting-edge, best marked on 

 the immobile finger. Legs stout, of moderate length. 



The abdomen of the male consists of 5 segments, the 3rd-5th being 

 fused. 



The species of Trapezia are found in the crevices of coral-stocks. 



Key to the Indian species of Trapezia. 



I. A distinct spine or tooth at the junction of the antero- 

 lateral and postero -lateral borders of the carapace ; — 



i. Lower border of hand sharp, entire : — 



1. Outer surface of hand, in its upper part 

 at least, covered with a mass of fine 



tangled downy hairs T. cymodoce. 



2. Outer surface of hand smooth and bald : — 



a. Carapace and appendages plain 



yellowish or reddish brown T. ferruginea. 



b. Carapace (and sometimes also the 

 upper surface of the hands) covered 

 with an elegant meshwork of fine 

 dark brown lines (a scurfy pubes- 

 cence on outer surface of hand, 

 occasionally) T. areolata. 



e. Carapace and appendages every 

 where covered with roundish red 



spots T. maculata. 



d. Carapace covered with faintish 

 brown spots, upper surface of hands 

 with a network of brown lines ... T. intermedia. 

 ii. Lower border of hand granular or bluntly ser- 

 rulate : carapace, etc. covered with roundish red 

 spots ,., T. rufopunctata. 



II. Nothing more than an indistinet notch at the junction 

 of the antero- lateral and postero-lateral borders : 



colours, in spirit, blackish brown T. digitalis. 



With the species of Trapezia the citations of the various writers 

 are so extremely uncertain that I have given up the attempt to make 

 them complete. 



Ortmann, in Zooloyische Jahrbucher, Abth. fur System a tik, etc. X ii 



