Mr. F. P. Pascoc on the Genus Dicranoccphalus, 3 



Within the last week or two I have been presented wnth a fine set 

 of Coleoptera collected in Japan, the coast of ;^[antchouria, south of 

 the Amoor, &c., by Arthur Adams, Esq., late Surgeon of II. ^[.S. 

 * Actaeon ; ' and among others there was a specimen of the genus from 

 Chosan, in the Corean Peninsula, which, on comparison, I found to 

 differ from the other two, and this I have dedicated to the generous 

 donor. I will first give the diagnostic characters of the three forms, 

 and then a comparative view of their differences, which will be more 

 intelligible, I think, than a more minute description. 



Dicranocephalus WalUchii, Hope. 



D. griseo-pubescens ; prothorace lato, turgido, carinis duabus, medio, 



elongatis ; elytris breviter subquadratis. 

 Hab. Nepaid. 



Dicranocephalus Bowringii, 



D. griseo-pubescens ; prothorace modice convexo, carinis duabus, medio, 



distinctis, brevibus ; elytris angulo humerali triangulari-impresso. 

 Hah. North China. 



Dicranocephalus Adamsii. 



D. gi'iseo-pubescens ; prothorace modice convexo, carinis duabus, medio, 



parum obsoletis ; elytris angulo humerali rotundato, baud impresso. 

 Hah. Corea. 



The first, D. Wallichii, is a very much broader insect ; the pro- 

 thorax very convex, and swollen anteriorly, and, if viewed in profile, 

 presenting a very considerable cui^e, — the two carina) on its disk 

 distinctly raised, narrowly and strongly defined, and, from the curve, 

 appearing much longer ; the elytra are broader and more quadrate, 

 that is, less narrowed behind ; and the tarsi are testaceous yellow, 

 ringed with black. 



The second, D. Bowringii, has also the tarsi coloured in the same 

 way, and the carinae on the prothorax are equally well defined, 

 although shorter ; but the other characters present a marked contrast 

 to the above. 



The third, D. Adamsii, has the tarsi entirely black ; and the carinae 

 have nearly disappeared, leaving only two broad marks, which 

 gradually shade off on each side, but arc tolerably distinct in the 

 middle, owdng to the sudden dip of the longitudinal cavity, which is 

 alike common to all the forms ; and the humeral angle, which forms 

 a sort of boss, is rounded, and without the triangular cavity of D. 

 Bowringii. 



These are not all the differences between the two last forms. D. 



