244 Records of the Indian Museum, [Vol. Ill, 



4. Potamon {Potamon) atkinsonianum , Wood-Mason, 

 var. ventriosum. 



This variety agrees in every respect with Wood-Mason's type, 

 except in the form of the male abdomen, which is broad, the sixth 

 segment being twice as broad as long. It is represented by a single 

 specimen, a large male with a carapace nearlj^ two inches 

 broad, from Kumaon, about 6,000 feet elevation. It is possibly 

 an aberrant individual, not a " variet}^ " in the strict sense of the 

 term — if terms were alwa^^s used in their strict sense. 



5. Potamon {Potamon) bif avium, sp. nov. 



Belongs to the atkinsonianum clan, and is distinguished from 

 atkinsonianum by the followins: characters : — {a) The carapace is 

 distinctly convex behind the frontal slope ; {b) the epibranchial 

 areolae are less distinct ; (c) the abdomen of the adult male is 

 broader, the sixth segment varying in length from almost half to 

 two thirds the greatest breadth ; {d) the legs are slenderer, for in- 

 stance, in the second and third legs the propodite is two-and a-half 

 times as long as broad. The species is represented by six males col- 

 lected by Dr. W. T. Blanford either in Sikhim or in Burma, 



6. Potamon {Potamon) andcrsonianum , Wood-Mason, 

 var. asperatum. 



Only differs from the type in having the entire carapace very 

 finely granulous. The specimens are young and the character 

 specified is variable. Thsy come from Ganjaminthe Cachar Hills, 

 about 4,000 feet elevation, — not from Ganjam on the East Coast, 



7. Potamon {Potamon) andersonianum, Wood-Mason, 

 var. manipurense. 



In this variety the surface sculpture of the carapace has a 

 '' worn" look, and the edge of the front is a little sinuous. A 

 male and a female from the Manipur Hills. 



8. Potamon {Potamon) andersonianum, Wood-Mason, 

 var. tritum. 



In this variety the surface sculpture is still more worn-looking, 

 and the edge of the front is so sinuous as to suggest four faint 

 lobes. A single female from the Kakhyen Hills, Upper Burma ; 

 in Dr, J. Anderson's Yunnan collection. 



9. Potamon {Potamon) edwardsi, Wood-Mason, var, hirtum. 



In this variety the tufts of bristly setae on the dorsum of the 

 carapace may be so numerous as to give the specimen a harsh 

 woolly feel, and the legs are rather thickly hirsute. The pustule- 

 like tubercles of the upper surface of the palm may be more 



