1898.] A. Alcock — Carcinological Fauna of India. 191 



2. Normal species in which the carapace (like the legs and 

 the greater part of the chelipeds) is covered with a more 

 or less thick coat of hair, and is without raised ridges : — 



I. Front about a third the greatest breadth of the 

 carapace : — 



i. Carapace declivous anterioi'ly, flat posterior- 

 ly ; the outer orbital angle is not a spine, 

 though it may be sharp : — 



1. Upper margin of orbit with two, very 

 distinct, triangular gaps or notches : — 



a. A subhepatic spine just below 



outer orbital angle P. vespertilio* 



b. No subhepatic spine : — 



x. Free edge of front, and 

 upper margin of orbit, finely 

 denticulate : front very pro- 

 minent P. longicornis. 



y. Free edge of front, and up- 

 per orbital margin, smooth 

 or nearly so : front not 

 prominent P. andersoni. 



2. Upper margin of orbit with one or 

 both of the two notches indistinct or 

 absent : — 



a. Regions and areolae of carapace 

 convex, uniformly granular, and 

 separated by smooth, deepish, 



clean-cut grooves P. cxrulescens* 



6. Regions etc. of carapace faintly 



demarcated and not uniformly 



granular : — 



x. Notches in the denticulated 



upper orbital margin faint 



but distinguishable P. sluiteri. 



y. Only one notch in the 

 smooth upper orbital mar- 

 gin, and that faint : legs 



long and slender P. cursor. 



ii. Carapace uniformly convex, or globose; the 

 outer orbital angle is a spine like those of 

 the antero-lateral border : — 



1. Regions of carapace fairly distinct : 

 whole outer sui-face of larger hand 

 covered with sharp prominent spine- 

 like tubercles P, dorsipes. 



2. Regions of carapace faint ; lower part 



of outer surface of hand smooth P. hirsutus. 



II. Front nearer half than a third the greatest 

 breadth of the carapace, nearly straight, finely 

 denticulated, emarginate in the middle line P. dehaanii. 



