320 



Memoirs of the Indian Museum. 



fVoi.. Ill, 



Genus Pleurarius, Kaup. 

 I have not seen a specimen of P. pilipes, and can find nothing in Kaup's descrip- 

 tion and figure by which to separate it from the Indian species. P. pilipes, from 

 Sumatra (above, p. 279), and P. hrachyphyllus , from India (above, pp. 213 and 280), are 

 the onh' species of the genus that have yet been described. 



Genus Tiberioides, Gravely. 



Lateral grooves of elytra narrow, normally punctured 

 I Lateralgiovesof elytra broad, their punctures transversely linear T. kuwerii, pp. 215 & 

 protuberance on anterior margin, somewha" as 

 om/)/o;n', and a stron;.^ t ransverse ridge a little 

 further back .. .. .. .. T. borealis, ■p. 2d,i. 



Mentum without any such ridge or protubeiance . . . . T. aiisteni, pp. 216 «& 



( Mentum with a ] 

 j in Epispheniis co 



Genus Episphenus, Kaup. 



( Anterior margin of head symmetrical ; anterior margin of men- 



, j turn not depressed or grooved 

 j Anterior margin of head more or less asymmetrical ; anterior 

 Vraargin of mentum more or less depressed or grooved 

 ( Anterior margin of head not very strongly asymmetrical as a 

 I rule; anterior maigin of mentum strongly grooved on either 



I side of a strong median tubercle (occasionally paired) 

 I Anterior margin of head strongly asymmetrical; mentum 

 V^without any strongly marked tubercle 

 ( Anterior angles of head not prominent 



( Anterior angles of head more or less prominent . . 



Genus Ophrygonius, Zang. 



( At least five well developed and pubescent antennal lamellae 

 ' i Antennal lamellae very short, only four of them pubescent . . 



r Anterior lower tooth of both mandibles normal, conical and 

 ^ J acute 



j Anterior lower tooth of both mandibles very broad, more 



[^ obtuse, flattened dorso-ventrally 



I Left outer tubercle moderately stout, directed more or less 



E. moorci, pp. 217 and 281. 



E. coiiiptoni, pp. 21S & 281. 



3- 

 222 & 



3' forwards 

 I Left outer tubercle 



.•ery slender, directed strongly inwards 



E. neclgherriensis, pp. 



283. 

 E. indicus, pp. 220 & 2S2 



O. inaeqnalis, pp. 227 & 283 



O. singapurae, pp. 226 & 285. 



0. cantori, pp. 224 & 284. 

 O. birmanicus, pp. 226 & 285. 



Genus Aceraius, Kaup. 

 Many of the characters by which the species of this genus are distinguished one 

 from another are .somewhat variable even in fresh specimens, and are verj- often 

 modified by friction. When a series of each species is available for reference their 

 determination is not very difficult ; but when .single specimens are to be determined 

 the difficulty is often great, and size and locality will sometimes be found to afford a 

 simpler clue to their identity than this key. The full range of the variation that I 



