388 Mr. G. Lewis on 



tibise carinate and scarcely narrowed near the tarsi. In small 

 males the thoracic armature is very short and stout, and this 

 form admits of the eyes bein^? seen from above outside the 

 horns ; in the large individuals the horns intervene. In the 

 females the horns are absent, but the anterior part of the 

 thorax is gibbous. 



B. 4-dentatus, Cand,, differs from the above in having more 

 slender antennas, with two conspicuous frontal denticulations 

 on the anterior edge, and in having the tibise very markedly 

 narrowed from the middle to the tarsal end. 



Hab. Yuyama. A large boletus was found full of speci- 

 mens in all stages on the 11th May, 1881. 



Byrsax mpomcus, sp. n. 



Ovalis, supra parum convexus, fuscus, rugose sculpturatus, nodu- 

 losus ; antennis ferrugineis ; pedibus brunnois ; cJ capite corni- 

 bu8 duobus elongatis erectis ; thorace explanato. 



L. 5-6| miU. 



Oval, ratlier convex above j the male — head rugose, with 

 two long slender horns, diverging upwards from their bases, 

 slightly turning in at their tips, forehead depressed between 

 the horns, the thorax laterally explanate, edges Urate, broadest 

 just before the base, rough and nodulose; the elytra rough 

 and nodulose, very similar to those figured for Atasthalus 

 hellicosus ; the female — head rugose, not depressed, lateral 

 edges of the thorax more strongly lirate and much more 

 widened out before the base ; in both sexes the anterior and 

 intermediate tibiae are slightly narrowed before the tarsal end 

 and carinate their whole length ; the legs obscui'c brown, an- 

 tennae ferrugineous. The ocular ridges project more in the 

 male than in tiie female. 



llah. Nara. About a dozen examples from a boletus, 

 27th June, 1881. 



Byrsax spiniceps, sp. n. 



Oblongus, supra modice convexus, dense squamosus ; S capite 



cornibus duobus spiniformibus. 

 L. 3-4 mill. 



Oblong, moderately convex above, with a whitish squama- 

 ceous substance, which, in uninjured specimens, obscures all 

 sculpture. The male with two long spine-like horns, which, 

 when viewed sideways, are seen to be bent forwards in the 

 upper half, ocular ridge projecting into an outline of an 

 obtuse angle ; the thorax, lateral margins widely explanate. 



