1914-] ^- H. GravKIvY : An Accotmi of the Oriental Passalidae. 319 



Genus Taeniocrs, Kaup. 



C Upper surface of central tubercle about twice as long as broad , 

 1 flat, punctured, bordered by very distinct liorse-shoe-shaped 



J ridge which is open in front . , . . ,. T. bicanthatus, pp. 208 & 270. 



I Upper surface of central tubercle relatively broader as a rule, 



less flattened, unpunctured, marginal ridge often indistinct or 

 1^ absent across middle-line behind as well as in front . . . . . . 2, 



( Anterior tibiae very broad . . . , . . . . T. platypus, p. 270. 



\ Anterior tibiae slenderer . . . . . . . . . . , 3. 



Anterior margin of canthus meeting side of head a considerable 



distance behind anterior angle; external angle of canthus 



obtuse . . . . . . . . . . T. pygmaeiis, pp. 209 & 271. 



^ 1 Anterior margin of canthus meeting side of head a very short 



distance behind anterior angle; external angle of canthus 

 I sharper .. .. .. .. .. T. bicus pis, pp. 210 & 272 



Genus Aulacocyclus, Kaup. 



Apical portion of central tubercle not very strongly bent over 



forwards, directed a little upwards rather than downwards, the 



upper margin straight . . . . . . . . . . . . 2. 



Apical portion of central tubercle more strongly bent over for- 

 wards, never upwardly directed, at least the extreme distal 



portion of the upper margin bent a little downwards . . , . . . 3. 



/Dorsal grooves of elytra unpunctured . . .. .. A. rosenbergii, p. 2/^. 



2' Dorsal grooves of elytra very distinctly punctured, as in the 

 y the two following species . . . . . . . , A. dilatus, p. 276. 



Central tubercle as seen from above not or scarcely broader in 

 oß front than behind .. .. .. .. .. .. 4. 



Central tubercle seen from above much broader in front than 



behind .. .. .. . .. A. andrewsi, p. 211 & 2y 5. 



cal portion of central tubercle very short, not bent down- 

 wards as a whole .. .. .. .. A. ayuensis, p. zyy. 



I Apical portion of central tubercle much longer, very slightly 



V^but distinctly berit downwards as a whole . . . , .4. parryi, p. 276 



/Apici 

 4 1 ward 



Genus Ceracupcs, Kaup. 



/Apex of horn formed by fusion of central tubercle with ante- 

 I rior margin of head bifid . . .... . . . . . , 2. 



1^ Apex of this horn acute .. .. .. .. C. aMs^^m, pp. 212 & 278. 



^ Upper surface of this horn roughly parallel-sided throughout . . C. arrowi, p. 278. 



I, Uper surface of this horn much broader in front than behind C. fronficoniis pp. 212 & 277. 



Genus Cylindrocaulus, Fairmaire. 

 Onl}^ one species, C. bucerus, p. 279. 



Genus Auritulus, Zang. 

 Only one species, A. patalis, p. 279. 



