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



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

 practicallv devoid of sculpture ; chelipeds at least three 

 times length of carapace. ''Tympana on all segments of 

 sternum ]'i ... ... ... ... ... D. mvdiroides. 



II. Carapace broader than long; 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 base occupying the whole of the 

 posterior margin. 



a. Tympana present on 2nd and 3rd segments of 

 sternum ; fingers of chela longer than palm, 

 each in the adult male with a large tooth on its 



inner edge ... ... ... .■ D. feiiestrata. 



b. No tympana on sternum ; fingers of chela not 



longer than palm and without large teeth ... D. sulcata. 



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 i^ times as long as propodus ... D. pertnia.x. 



b. Gastric area pentagonal ; no posterior trans- 

 verse groove ; dactylus of last leg 2ee as long 



as propodus ... ... ... D. vialabnn'ca. 



B. Groove parallel to lateral margin of carapace simple, 

 not bifurcated anteriorly. 



1. Gastric and cardiac areas entire, not divided by 

 a median longitudinal groo\-e ; transverse groove 

 near posterior margin incomplete in the middle; 

 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. iviclnnniini. 



2. A deep mid-dorsal groove extending from front 

 to posterior margin ; transverse posterior groove 

 complete ; 4 (or 3) small lobules on gastric re- 

 gion isolated by grooves ; no tooth below orbital 

 angle and no tubercle on carpus of cheliped ; no 

 tympana on sternum. 



n. Only a single oblique groo\e running from 

 side of cardiac region towards po.stero- lateral 

 angle ; lower surface of palm not carinate ... D. blanfoi-di. 



b. Two oblique grooves running from side of 

 cardiac region towards po.stero-lateral angle ; 

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



Dotilla myctiroides (Milne-Edwards). 



1900. Dotilla myctiroides, Alcock, Joiirn. Asiat. Sac. Bengal I,XIX, 



p. 368. 

 I goo. Scopimeva myctiroides, Lanchester, Proc. Zool. Sac. Lo)idon, p. 760, 



pi. xlvii, tig. 14. 

 1907. Dotilla myctiroides, Stimpson, Smitlison. Misc. Coll. XLIX, p. loi. 

 1907. Dotilla mvctiroides, Willey, Spolia Zeylaiiica V, p. 38. 

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



1 Sternal tympana otherwise occur only in D. fenestrata and D. ivichmanni. 



