14 



Synopsis of Indian Species. 



a. Dorsal surface of 5th segment of tail with 



compressed, elevated lateral keels ; the area 



between these keels strongly concave B. austratis, p. 15. 



b. Dorsal surface of 5th segment of tail with 



rounded or at most slightly elevated and 



granular lateral edges ; the area between the 

 edges flat or lightly 



ly convex, with a median 

 longitudinal depression. 

 a 1 . Inferior median keels of 2nd and 3rd caudal 

 segments and the anterior border of lower 

 side of 4th furnished with large paired 

 lobate teeth ; anterior terga of abdomen 



with a transverse granular crest B. dories, p. 16. 



A 1 . Inferior median caudal keels evenly or 

 almost evenly granular ; anterior terga of 

 abdomen without transverse granular 

 crest. 



.o a . Inferior lateral keels of oth caudal seg- 

 ment not evenly granular, the granules 

 increasing in size and becoming deuticu- 

 liforru or lobate posteriorly. 

 a 3 . Median and posterior keels of carapace 

 in contact and forming a pair of con- 

 verging, nearly continuous ridges ; 

 distance between posterior ends of these 

 keels less than distance between pos- 

 terior margin of carapace and ocular 

 tubercle ; hairs on underside of tarsi 



longer, not spiniform B. macmahoni, p. 18. 



.b 3 . Median and posterior keels of carapace 

 forming a pair of irregular interrupted 

 crests ; distance between their pos- 

 terior ends about equal to distance 

 between posterior edge of carapace 

 and ocular tubercle ; hairs on under- 

 side of tarsi short and spiniform. 

 a 4 . Intercarinal spaces of tail smooth ; 

 granules of inferior keels of 2nd and 

 3rd caudal segments increasing in 

 size posteriorly ; inferior lateral 

 keels of 5th more strongly lobate . . B. caucasius, p. 19. 

 b 4 . Intercarinal spaces of tail finely gra- 

 nular; granules of inferior median 

 keels of 2nd and 3rd caudal seg- 

 ments not increasing posteriorly; 

 inferior keels of 5th caudal seg- 

 ment less strongly lobate B. atrostriatus, p. 20. 



b*. Inferior lateral keels of 5th caudal segment 



evenly and finely granular throughout. 

 a' 1 . Hand granular and furnished 



granular and furnished with 

 finely granular keels ; abdominal sterna 

 finely and closely granular ; median 



and posterior keels of carapace forming [p. 20. 



an unbroken line . acute-car tnatus, 



