118 A. Alcock — Carcinological Fauna of India. [No. 1, 



Key to the Indian species of the sub-genus Leptodius. 



I. Carpus (and sometimes the propodite also) of the four 

 last pairs of legs strongly bicarinate dorsally — the 



crests enclosing a trough-like cavity L. cavipes. 



II. Carpus and propodite of last four pairs of legs normal : — 



i. Four teeth (exclusive of the orbital angle) on 



the antero-lateral border : postero-lateral border 



not or hardly shorter than the chord of the 



antero-lateral border L. exaratus. 



ii. More than four teeth on the antero-lateral border: 

 postero-lateral border distinctly shorter than the 

 chord of the antero-lateral border : — 



1. Front bilaminar, the lobes having a slight- 

 ly concave edge : 5 teeth on the antero- 

 lateral margin L. sanguineus. 



2. Front bilaminar, the lobes so deeply con- 

 cave as to make the front almost quadri- 

 dentate : — 



a. Five teeth on the antero-lateral 

 margin : finger-tips often rather in- 

 distinctly hollowed out : — 



a. Carapace cut up into numer- 

 ous strongly convex lobules : 

 upper surface of wrist and 

 hand strongly and sharply 

 rugose and nodular L. euglyptus. 



/3. Lobules of carapace not very 

 numerous, not very convex, 

 smooth : upper surface of wrist 

 and hand somewhat rough ... L. crassimanus. 



b. Eight to ten irregular teeth on the 

 antero-lateral margin L. nudipes. 



44. Xantho (Leptodius) exaratus (Edw.) A. M. Edw. 



Chlorodius exaratus, Milne Edwards, Hist. Nat. Crust. I. 402 ; and in Cuvier 

 Re_rne An. Crust, pi. xi. fig. 3 : Dana, Proc. Ac. Nat. Sci. Philad. 1852, p. 79; and 

 U. S. Expl. Exp. Crust, pt. I. p. 208: Stimpson, Proc. Ac. Nat. Sci. PhilRd. 1858, 

 p. 3L 



Leptodius exaratus, A. Milne Edwards, Nouv. Archiv. du Mus. IV. 1868, p. 71 

 and IX. 1873, p. 222 : Kossmann, Reise roth. Meer. Crust, p. 32, pi. ii. fig. 1-6 

 Hilgeudorf MB. Ak. Bed. 1878, p. 790 : Richters in Mobius Meeresf. Maurit. p. 148 

 Uaswell, Cat. Austral. Crust, p. 60: Miers, Zool. H. M. S. Alert, pp. 183 and 214 

 de Man, Archiv. f. Naturges. LIU. 1887, i. p. 285, and Journ. Linn. Soc , Zool., 

 XXII. 1887-88, p. 33; and in .'Weber's Zool. Ergebn. Niederl. Oat. Ind. II. 1892 

 p. 278, and Zool. Jahrb., Syst., VIII. 1894-95, p. 521 : Cano, Boll. Soc. Nat. Napoli, 

 III. 1889, p. 202: J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 362; 

 Wliitelegge, Mem. Austral. Mus. III. 1897, p. 137. 



