60 Dr. Sharp on the Rhynchophorous 



M. Roelofs, and it is deserving of attention as an 

 assistance in the discrimination of the species of this 

 most difficult genus. 



R. venustus was found on a large-leafed acer; R. regalis 

 on a species of ampelopsis. 



Byctiscus reversus, n. s. 

 (?. Supra aurato-pixrpureus, subtus cum pedibus violaceo- 

 cyaneus ; thorace parce punctato, utrinque spina crassa, brevissima 

 armato, elytris fortiter irregulariter punctatis. Long, rostro por- 

 recto, 6 mm. 



This is much smaller than B. venustus, and, though I 

 have only one example before me, I think it more than 

 probable it will prove to be a distinct species. The 

 very short spines on the side of the thorax, the sparing 

 punctuation of that part, and the fact that it is less 

 elongate, seem to me sufficient for its distinction ; there 

 is very little angular dilatation of the rostrum at the 

 sides, and the submental plate is not produced over the 

 mouth. Thus I have little doubt we have here a species 

 intermediate between B. renustus and B. populi. 



Miyanoshita, May, 1880 ; one specimen. 



Byctiscus fausti, n. s. 



Minor ; infra pedibusque purpureo-cyaneus ; supra colore varia- 

 bilis, vel, auratus vel purpureus vel cyaneus, nitidns fere absque 

 pubescentia, elytris fortiter punctatis, punctis subseriatis. Long. 

 4 — 5 mm. 



Mas, thorace utrinque minute spinoso. 



Similar to B. pojnili, but with a much shorter rostrum, with the 

 antennae inserted more on the upper surface of the rostrum, so that 

 it is compressed between them and very convex ; the antennae also 

 are nearer to the eyes, and the surface between the eyes and the 

 antennal insertion appears somewhat depressed. In the male the 

 thoracic spines are very small, and the submental plate is not 

 produced. The species, therefore, is not at all closely allied to 

 B. populi. The antennas are very thick, and the basal two joints 

 of the club are transversely quadrate, their margins remarkably 

 rectilinear. The thorax is sparingly punctate, shining ; the elytra 

 coarsely punctate, with a few finer punctures on the interstices.* 



^ The following species is allied both to B. fausti and B. populi : 

 — B. 'parviilus, n. s. ^ . Minor, infra nigro-cyaneus, supra aurato- 

 viridis, elytris absque pubescentia, fortius punctatis, thorace utrin- 

 que minutissime spinoso. Long, cum rostro, 5 mm. Hab. Siberia 



