302 Mr. D. Sharp's revision of the 



Tyeus. 

 Tyrus japonicm, n. s. 



Eufus, abdomine fusco-rufo, evidenter pubescens, pro- 

 tborace impunctato, basi linea curvata impressa paruni 

 distincta ; elytris humeris sat pronrinulis, intra bumeros 

 depressis, ad basin minute quadrifoveolatis, stria suturali, 

 aliaque discoidali abbreviata ; abdomine segmento primo 

 dorsali in medio ad basin plicula elevata paruin con- 

 spicua. Long. 2 mm. 



Mas, antennarum clava elongata, articulis 9 et 10 

 latitudine longioribus, femoribus anterioribus parum 

 perspicue bituberculatis, trochanteribus intermediis 

 longius bispinosis, abdomine longitudinaliter in medio 

 depresso. 



This species, allied to the European Pselaphus mucro- 

 natus, ~P&nz., is nevertheless abundantly distinct therefrom 

 by the rufescent colour, by the pubescent surface, less 

 elongate thorax, and by the male characters ; it has, too, 

 the maxillary palpi larger, though similarly formed, and 

 their articulated apical seta remarkably conspicuous. 



Nagasaki, March, 1881 ; Hitoyoshi, May 16th ; Kobe, 

 June 6th ; Wada toge, Aug. 1st. In each case a single 

 specimen only was found. 



Batbisus. 



The fine series of species of this genus, discovered by 

 Mr. Lewis, shows that these forms constitute the most 

 important portion of the Pselaphid fauna of Japan. 

 They exhibit much variety in their structural characters, 

 while the secondary sexual characters of the males show 

 a multiplicity of various extraordinary and inexplicable 

 structures of different kinds, and situate in diverse parts 

 of the body, forming a series that is, I think, without 

 equal in any other genus of Coleoptera. Although 

 species of the genus Batrisus are in the European fauna 

 but few, yet in many other parts of the world they form 

 a large and important part of the Pselaphidce, and a 

 division or arrangement of the species is necessary, if 

 only to facilitate then determination. Several genera 

 and subgenera have been erected for the species, based 

 chiefly on the European and North American forms, but 

 they cannot be looked on at present as satisfactory, and 

 a monographic revision of the whole of the genus will 



