the Staphylinid^e of Japan. 463 



Mycetoporus. 



The Japanese species of this genus are better placed in the 

 subgenus Isclinosoma^ Key : Mycetoporus^ i. sp., which con- 

 tains all the European species of the genus except two, not 

 being represented in the Japanese fauna so far as we know it 

 at present. 



Mycetoporus convexus, n. sp. 



Angustulus, iiitidus ; antennis crassiusculis, testaceis ; capite tho- 

 raceque fiisco-testaceis, peruitidis ; elytris sordide testaceis, serie- 

 bus dorsalibus et discoidalibus remote punctatis ; abdomine fusco, 

 segmento penultimo late testaceo-cingulato. 



Long. 4 millim. 



Antennge stout, clear yellow, the penultimate joint about 

 as long as broad. Thorax very convex, about as long as 

 broad. Elytra rather longer than the thorax, the dorsal series 

 consisting of four or live indistinct punctures, the sutural 

 series of about six rather more distinct. Hind body slender, 

 its setge very largely developed and conspicuous ; the colour 

 is nearly black, the hind margins of the segments being 

 reddish, that of the penultimate segment very broadly so. _ 



Hitoyoshi and Hosokute ; one example from each locality. 



Mycetoporus discoidaUs, n. sp. 



Angustus, fusculus ; antennis, palpis, thorace, pedibus elytrisque 

 testaceis, his disco late f uscescente ; abdomine segmentis poste- 

 rius testaceo-marginatis, dense punctate ; elytris seriebus dorsali- 

 bus et suturalibus crcbre punctatis. 



Long. 5 millim. 



Antennae only moderately long and not stout, penultimate 

 joints hardly so long as broad, the middle joints a little in- 

 fuscate. Head narrow, infuscate yellow. Thorax rather 

 small, scarcely so long as broad, clear yellow. Elytra longer 

 than the thorax, infuscate on the middle, so as to leave the 

 hind margin broadly yellow and a yellow mark at each 

 shoulder; the punctures of the dorsal and sutural series, 

 though fine, are very distinct and numerous, there being 

 from twelve to fifteen in each series. The slender hind body is 

 densely punctate; the hind margins of the segments are 

 broadly yellow, that of the penultimate segment very 

 broadly. The male has the middle of the last ventral plate 

 deeply depressed behind, the depression surrounded by a 

 scabrous margin, and a tuft of seta on each side projecting 

 backwards beyond the hind margin. The hind margin of 

 the preceding segment is feebly emarginate in the middle and 



