Pselaphidce of Japan. 297 



transverso, basi vix discrete foveolato, elytris hoc vix 

 duplo longioribus. Long, lj mm. Mas, antennis 

 articulis 3 — 7 brevioribus, 8 — 11 elongatis inter se sub- 

 a3qualibus. 



This species may be placed in the subgenus Sognorus, 

 Reitter. Compared with Ctcnistes Oberthuri, it is 

 slightly larger, with the elytra longer and not so narrow 

 in front ; the antennae of the female are formed much as 

 in that sex of C. Oberthu/ri, joints 3 — 9 differing but 

 little from another, while the 10th is rather larger, 

 slightly transverse ; terminal joint large and stout, as 

 long as the three preceding together. In the male joints 

 4 — 7 are short and similar to one another ; 8 — 10 elon- 

 gate, subequal, each twice as long as broad ; terminal 

 joint rather longer than the preceding. Head quite 

 broad and short, the two foveas of the vertex large. 

 Thorax evidently transverse. Elytra densely setulose at 

 their hind margin. Posterior trochanters quite short. 

 The sexual characters, except as regards the antennae, 

 are slight. 



Tokio, 25th March, 1880 ; Yokohama ; Niigata, 13th 

 September, 1881 ; in all seven specimens, of which two 

 only are males. 



Centrotoma. 



Centrotoma prodiga, Sharp. 



Sharp, Trans. Ent. Soc. Lond., 1874, p. 107. 



Mr. Lewis has found a second individual of this 

 species, with the claviger ant, on the Shiwojiri-toge, 

 30th July, 1881. The species is truly a Centrotoma, 

 distinguished from C. lucifuga by the more distant and 

 coarser setulosity, and by the less transverse, more bead- 

 like, joints of the antennae. 



Stipesa. 



Stipesa rudis, Sharp. 



Sharp, Trans. Ent. Soc. Lond., 1874, p. 109. 



This anomalous insect is still unique, and on looking 

 at it again, as I am enabled to do by the kindness of 

 Mr. Lewis, I can find nothing in my description to alter 

 or supplement. It appears to be, as conjectured by 

 Herr Reitter, an anomalous member of the Ctenistini, 

 having probably, though not certainly, unequal claws 



