308 Mr. I). Sharp's revision of the 



rnento ultimo ventrali fovea magna et profunda depressa. 

 Fern, incog. 



The antennae are stout ; joints 2 — 8 but little different 

 from one another, being each about as long as broad ; 

 9th joint very slightly, 10th a little more distinctly, 

 broader ; terminal joint scarcely broader, as long as the 

 two preceding together, acuminate. 



This species appears in the male sex to be very distinct; 

 two specimens have been found. Hakone, amongst 

 rotten wood ; Chiuzenji, 24th Aug., 1881. 



IV. 1st dorsal segment about twice as long as the 2nd; 

 side-piece broad or moderately broad. Hind tibice 

 without apical spur. Front of head in male remark- 

 able. B. caviceps and B. oscillator. 



In B. oscillator the line marking off the side-piece of 

 the 1st dorsal segment does not extend to the hind 

 margin. 



Batrisus caviceps, n. s. 



Major, gracilis, densius pubescens, rufus, antennis sat 

 crassis, elongatis, palpis articulo ultimo sat elongato ; 

 capite minus brevi, posterius angustato, sed truncato, 

 angulis posterioribus minute prominulis, dense pube- 

 scentibus, antennis a labro fissura profunda divisis ; 

 prothorace elongato, medio canaliculato, utrinque versus 

 basin angulo elevato minuto, ad latera impresso ; ely- 

 tris crebrius evidenter punctatis, absque striola dis- 

 coidali ; abdomine elongato, segmento dorsali primo 

 parum elongato, sequentibus duobus vix aequali. Long. 

 3 mm. 



This is another very peculiar species, of which only a 

 single specimen has been found ; it is very remarkable 

 by the structure of the head, which is thickened in the 

 vertical direction, and so formed that the upper portion, 

 on which the antennae are inserted, is separated by a 

 deep fissure from the labrum ; the fissure can only be 

 seen by looking at the head from the front ; the antenna 

 have the basal joint rather long and stout, joints 2 — 9 

 each longer than broad, 10th about as long as broad, 

 terminal joint stouter, acuminate, as long as the two 

 preceding. The sides of the head are densely pubescent, 

 and the under surface likewise. The lateral plica of the 



