1899.] A. Alcock — Carcinological Fauna of India. 137 



Key to the Indian species of the genus Dromia. 



I. Carapace, in the adult, broader than long : front cut into 3 

 teeth of nearly equal size, of which the middle one is slightly 

 the most prominent : third (penultimate) pair of legs hardly 

 shorter than the fourth (last) ; no large spiue at the far end of 

 the posterior border of the propodite of the fourth (last) pair D. rumpUi, 



II. Carapace, in the adult, at least as long as broad : front cut 

 into 3 teeth, of which the middle one is so small and so much 

 deflexed as to be almost invisible in a dorsal view : third pair 

 of legs very markedly shorter than the fourth ; a spine at 

 the far end of the posterior border of the propodite of the 

 fourth (last) pair quite as long as that at the same end of the 

 anterior border : — 



1. True antero-lateral border of the carapace with 3 or 4 



spines ... ... ... ... ••• D. cranioides. 



2. True antero-lateral border of the carapace entire ... D. unidentata. 



4. Dromia Bnmphii, Fabr. 



Cancer lanosus, Rumph, Amboin. Rariteitk. p. 19, pi. xi. fig. 1 : Seba, Thesaurus, 



III. pi. xviii. fig. 1. 



Dromia Rumphii, Fabricius, Ent. Syst. Suppl. p. 360 : Milne Edwards, Hist. 

 Nat. Crust. II. 174 : De Haan, Faun. Japon. Crust, p. 107, pi. xxxii : Stimpson, Proc. 

 Ac. Nat. Sci. Philad. 1858, p. 240: Tozzetti, "Magenta" Crust., p. 207 : Hilgendorf 

 MB. Ak. Berl. 1878, p. 812 : Miers, Ann. Mag. Nat. Hist. (5) V. 1880, p. 370 : Walker, 

 Journ. Linn. Soc. Zool., XX. 1886-1890, p. Ill : Ortmann, Zool. Jahrb. Syst. &c., 

 VI. 1892, p. 548 : J. R. Henderson, Trans. Linn. Soc, Zool, (2) V. 1893, p. 406. 



All parts, except the tips of the fingers and dactyli thickly covered 

 with a harsh tomentum, with sometimes scattered tufts of longer hair 

 on the carapace. 



Carapace in adults broader than long, strongly convex, smooth ; 

 the cardiac region and the branchial or " cervical " groove on either 

 side of it plainly marked, the gastric region faintly indicated. 



Front cut into 3 nearly horizontal teeth of nearly equal size, the 

 middle one on a lower plane and slightly the most prominent. 



In young specimens a projection of the upper edge of the " orbit " 

 marks the position of the true inner supra-orbital angle of the higher 

 Brachyura, but in large specimens this is obsolete. 



The true antero-lateral borders of the carapace are cut into 3 sharp 

 but coarsish spines, the 2nd of which often has a small secondary 

 denticle at its base. In addition there is a spine on the summit of the 

 infra-orbital lobule, and another at the outer angle of the buccal cavern. 



The postero-lateral borders are convergent and have one large 

 coarse spine, placed immediately behind the cervical groove. 



The borders of the arm are dentate, especially the upper border, 

 and there are 2 or 3 teeth at the distal end of the upper border of the 



