326 Records of the Indian Museum. [Vol. XVI, 



I. Carapace as long as broad, except for the lateral grooves 



practically dc\oid of sculpture ; chelipeds at least three 

 times length of carapace. [Tympana on all segments of 

 sternum]'... ... ' .. ... ... D. invctiroides/ 



II. Carapace broader than longv its surface strongly sculp- 

 tured ; chelipedes at most little more than twice length of 

 carapace. 



A. Groove parallel to lateral margin of carapace anteri- 

 orly bifurcated or Y-shaped. 



1. Two long parallel A -shaped grooves on dorsum 

 of carapace, the lower enclosing a large triangular 

 plane area with b.-ise occupying the whole of the 

 posterior margin. 



a. Tympana present on 2nd and ;>rd segments of 

 sternum ; fingers of chela longer than palm, 

 each in the adult male with a large tooth on its 



inner edge ... ... ... ■•• D. ft- nest rata. - 



b. No tvmpana on sternum ; fingers of chela not 



longer than palm and without large teeth ... D. siilaffa..^ 



2. No parallel A -shaped grooves on dorsum of 

 carapace; a cardio-intestinal area (much narrow- 

 er than posterior margin ) defined by lateral 



grooves. 



a. Gastric area triangular ; a faint transverse 

 groove near posterior margin ; dactylus of last 



leg not 1 1 times as long as propodus ... D. pert max. 



b. Gastric area pentagonal ; no posterior trans- 

 verse groove ; dactylus of last leg 2ee as long 



as propodus ... ... D. malabarica. 



B. Groove parallel to lateral margin of carapace simple, 

 not bifurcated anteriorly. 



1. Gastric and cardiac areas entire, not divided by 

 a median longitudinal groove ; tran.sverse groove 

 near posterior margin incomplete in the iniddle; 

 no lobules isolated by grooves on gastric region; 

 adult male with a tooth below orbital angle and 

 a strong compressed tubercle on inner and proxi- 

 mal aspect of carpus of cheliped ; tympana on all 



segments of sternum ... ... ... D. ivicliDiaiini. ■* 



2. A deep mid-dorsal groox'e extending from front 

 to posterior margin ; transverse posterior groove 

 complete; 4 (or ;^) small lobules on gastric re- 

 gion isolated by groo\'es ; no tooth below orbit.al 

 angle and no tubercle on carpus ot chelii^cd ; no 

 tympana on sternum. 



a. Only a single oblicjue groo\e running from 

 side of cardiac region towards postero- lateral 



angle ; lower surface of palm not carinatc ... D. blanfonli . 



b. Two oblique grooves running- from side of 

 cardiac region towards posterf)-lateral angle ; 



lower surface of palm strongly carinate ... D. intermedia. 



Dotilla myctiroides (Milne-Edwards). 



1900. Dotilla mvctiroides, .\lcock, 'Joitrii. Asiat. Soc. Bengal LXIX, 



p. 368.' 

 igoo, Scoptmera myctiroides, Manchester, Proc. Zool . Soc. London, p. 760, 



pi. xlvii, fig. 14. 

 1907. Dotilla myctiroides, Stimpson, S/nitlisoii. Misc. Coll. XLIX, p. loi. 

 1907. Dotilla myctiroides, Willey, Spolia Zeylanica \', p. 38. 

 1915. Dotilla myctiroides, Kemp, Mem. Ind. Miis. V, p. 227, fig. 8. 



' Sternal tympana otherwise occur onlv in D. fenestrata and D. ivichmanni. 



