On a 7^610 River- Grah from Yunnan. 155 



my enqnirieSj has kindly informed me that the type is really 

 a female. It bears two labels : on one there is only the 

 name of the collector, " Lorquin " ; on the other in red ink 

 there is the name of the insect, reference to the plate in 

 ' Eeise Novara/ and the locality " Molluk ? " ; but he agrees 

 with me that as Lorquin collected in the Celebes as well as 

 in other places, the type probably came from that locality. 

 It is citron-yellow above and below, and my females exactly 

 resemble the figure ; but the male is very differently coloured, 

 it is ochreous brown above and black below, with yellow 

 borders, like a large example of T. nebulosa, Butler, from 

 India, but the sexes of that form are alike. There is also a 

 citron-yellow form in India, common in the Khasia Hills, 

 sexes also alike — T. citrina, Warren, Nov, Zool. i. p. 401. 



Family Thyrididae. 



35. Rhodoneura fallax. 



rimramharafallax, ^^^1n•en, Aun. & Mag. Nat. Hist. ((5) xviii. p. 229 

 (189G). 



Khasia Hills. 



The type came from New Guinea. I have it also from 

 the same localitv. Thev are identical. 



XVI. — On a new Species of River- Crab from Yimnan. By 

 W. T. Calman, D.Sc, Bi'itish. Museum (Natural History). 



The British Museum has recently received two specimens of 

 a new species of river-crab collected by Mr. John Graham 

 from the lake at Yunnan Fu. The species appears to be 

 most nearly allied to the genus (or subgenus) Parathelphusa, 

 though differing remarkably from any species hitherto 

 described from Asia and resembling in some characters the 

 African group of species forming the subgenus Acantho- 

 thelphusa of Ortmann. The lake from which the specimens 

 were taken is situated at an altitude of 6000 feet above sea- 

 level and drains into the Yang-tze river-system. No species 

 of Potamouidaj appear to have been recorded from this part of 

 Yunnan, although Wood-Mason described throe species of 

 Potamon from Western Yunnan, a district belonging to the 

 river-system of the Irawady. 



