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



Mas, i'emoribus posterioribus facie anteriori late pro- 

 fundeque excisa, superne vesicula rnembranacea parvula 

 erecta ; metasterno in medio irnpresso, utrinque promi- 

 nulo ; abdominis segmentis ventralibus brevissimis. 



Antenna3 slender, rather elongate, the 3-jointed club 

 elongate and slender. Head almost even, the vertex 

 between the foveae slightly convex. Elytra with an in- 

 distinct minute prominent angle on the shoulder, and 

 with a broad discoidal stria which does not quite reach 

 the extremity. 



Although extremely similar to B. fragilis and its 

 allies, this species is readily distinguished by the rather 

 smaller size of its individuals, and their more globose 

 prothorax. The male characters are extremely peculiar, 

 the structure of the hind femora being, in fact, unique ; 

 they present, on their upper anterior face in the middle, 

 an elongate deep cavity ; in front of the cavity the 

 surface forms a small angular prominence, on the sum- 

 mit of which is placed a minute delicate vesicle. 



Mr. Lewis found a small series of this species at 

 Niigata, 15th Sept., 1881 ; there are but three males to 

 nearly a dozen females. 



Batrisus modestus, Sharp. 

 Sharp, Trans. Ent. Soc. Lond., 1874, p. 116. 



This species was described by me on two specimens, 

 supposed, on account of a slight difference in the 

 antennae, to be male and female. Mr. Lewis has again 

 met with the species, and discovered the male, proving 

 the two original examples to be both females. 



The following is a sketch of the remarkable male 

 characters : — 



Mas, tibiis anterioribus extus versus apicem dilatatis, 

 in prominentia pencilla articulata armatis ; pygidio 

 excavatione magna, profunda, irregulari, ad latera exca- 

 vationis glanduloso ; segmentis ventralibus omnium 

 brevissimis. 



Of the species there are two varieties ; in the first 

 the front tibiae of the male are not so much dilated, and 

 have only a fine pencil ; and the antennae of the female 

 are a little stouter than in the second form ; in this 

 latter the male tibiae are considerably more dilated, and 

 are armed with a broad pencil. 



