320 



Memoirs of the Indian Museum. 



[Vol. 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 only species of the genus that have yet been described. 



Genus Tiberioides, Gravely. 



j Lateral grooves of elytra narrow, normally punctured 



\ Lateralgrovesof elytra broad, their punctures transversely linear T. kimerti, pp. 215 & 280. 



/'Ml 

 I in 



■9' 



Mentum with a protuberance on anterior margin, somewhat as 

 Episphenus comptoni, and a strong transverse ridge a little 

 further back 

 Mentum without any such ridge or protubeiance . . 



T. borealis, p. 281. 



T. aiisteni, pp. 216 & 281. 



Genus Episphenus, Kaup. 



/'Anterior margin of head symmetrical ; anterior margin of men- 



j tum not depressed or grooved 



j Anterior margin of head more or less asymmetrical ; anterior 



Vmargin of mentum more or less depressed or grooved 



( Anterior margin of head not very strongly asj'mmetrical as a 



I rule; anterior margin of mentum strongly grooved on either 



2 side of a strong median tubercle (occasionally paired) 



j Anterior margin of head strongly asymmetrical; mentum 

 (^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 



( Antennal lamellae very short, only four of them pubescent . 



r Anterior lower tooth of both mandibles normal, conical and 



) acute 



\ Anterior lower tooth of both mandibles very broad, more 



(^obtuse, flattened dorso-ventrally 



/ Left outer tubercle moderately stout, directed more or less 



3 ^ forwards 



' Left outer tubercle very slender, directed strongly inwards . . 



E. moorei, pp. 217 and 281. 



E. comptoni, pp. 218 & 281. 



E. neelgherriensis , pp. 222 1 



283. 

 E. indicus, pp. 220 & 282. 



0. inaequalis, pp. 227 & 285. 



3- 



0. singapurae, pp. 226 & 285. 



O. canton, pp. 224 & 284. 

 0. birmanictis, 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 very 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 



