New Species of Staphylinidae from Singapore. 351 



Anterior tibiae with a double row of 

 spines; species cylindrical with 

 strongly geniculate antennae 



Anterior tibiae with a single row of 

 spines; species rather depressed, 

 antennae not or scarcely geniculate. 

 Thorax more or less tri-sulcate (ex- 

 cept in thoracicus) ; intermediate 

 coxae approximate .... 



ycutellum visible. Elytra without epi- 

 pleurae, the postero- internal angles 

 separately rounded so that a small 

 triangular space is apparent at the 

 suture ...... 



Scutellum concealed. Elytra with dis- 

 tinct epipleurae, the postero- internal 

 angles not separately rounded . 



Bledius Mannh. 



Oxytelus Er. 



Thinobius Kiesw. 



Trogophloeus Mannh. 



OSORIINI. 



1. Tibiae spinose. 



— Tibiae not spinose. 



2. Antennae geniculate; anterior tibiae 



dentate- spinose ; last joint of the tarsi 

 slender, not tumid .... 



— Antennae not geniculate ; anterior tibiae 



simply spinose ; last joint of the tarsi 

 tumid ... 



3. Thorax strongly contracted at the base ; 



4th joint of maxillary palpi subulate . Paragonus Fauv. 



— Thorax not or scarcely contracted at the 



base ; 4th joint of maxillary palpi not 



subulate ..... Holotrochus Er. 



Osorius Latr. 



Mimogonus Fauv. 



Megalopsini. 

 1. Antennae 11-jointed; tarsal formula 

 5, 5, 5. Form oblong, stout. Tibiae 

 simple ...... 



Megalops Er. 



Stenini, 

 Eyes very large, occupying nearly the 

 whole of the side of the head; 4th 

 tarsal joint simple or bilobed; apex 

 of abdomen without styles 



Stenus Latr. 



