1898.] A. Alcock — Care etiological Fauna of India. 201 



not very strong, and the anterior border of the merns of the external 

 maxillipeds is not notched. 



The chelipeds are stoat, and are unequal in both sexes : the fingers, 

 which are short and stout, are commonly defined as spoon-shaped at 

 tip : they- are not really so, but have the tips curved and blunt pointed. 



The legs are stout and not very long. 



The abdomen of the male consists of seven separate segments, and 

 the first tergum is unusually long and narrow in all the typical species. 



Most of the species of this genus, but not all, are densely tomen- 

 tose : all, however, 'have hairy or tomentose legs. 



Key to the Indian species of Actumnus. 



I. Carapace tomentose : — 



i. Carapace areolated : front separated from the supra- 

 orbital angle by a notch ; antero-lateral border cut 

 into 3 teeth (exclusive of outer angle of orbit): — 



1 . Front normally bilobed : supra-orbital margin 

 granular, with two distinct notches : — 



a. Carapace moderately convex, rather 

 faintly areolate ; outer angles of front 



hardly independent A. tomentosus. 



b. Carapace strongly convex, strongly 

 areolate ; the outer angles of the front 

 are small distinct little lobules : — 



x. Lateral gastric areolae semi- 

 circular A. setifer. 



y. Lateral gastric areolae UJ shaped A. verrucosus. 



2. Front broadly triangular, with a deep 

 button- hole cleft (the hole at posterior end) 

 in the middle line : supra-orbital margin 

 thin sharp, with a single deep very narrow 



fissure A. fissifrons. 



ii. Carapace not areolated ; front not separated from 

 the supra-orbital angle ; antero-lateral border with 

 7 spinuliform granules (3 pairs) and an odd one 



anteriorly A. elegans. 



II. Carapace perfectly bare : — 



i. Carapace not areolate, front broadly bilobed ; legs 



almost bare A, nudus. 



ii. Carapace very distinctly areolate, front with two 

 median lobes and two (external) lobules : legs 

 tomentose : — 



1. Surface of carapace (and of parts of chelipeds) 

 formed of a mosaic of smooth flat polygonal 



granules in the closest contact A, tc.ssellatus. 



2. Surface of carapace, etc. covered with sharp 

 crystalline granules in the closest contact ... A. nrb'Atum. 



J. ii. 26 



