On some Coleoptera from the Bonin Islands. 169 



XXIII. — Observations on some Coleoptera from the Bonin 

 Islands. By Charles O. Waterhouse and C. J. Gahan. 



The British Museum has recently received a few Coleoptera 

 collected by Herr P. A. Hoist in the Bonin Islands. They 

 are referable to three species, one being a new species of 

 Buprestidre of the genus Chrysochroa, most nearly allied to 

 C. purpureiventris from Penang &c. ; the second is a new 

 species of Ceresium, which has its nearest ally in a Chinese 

 species ; and the third is the widely distributed Sphenophorus 

 obscurus } Bdv. 



Chrysochroa Holstii, n. sp., Waterh. 



Elongata, angusta, aureo-viridis, raicans ; thorace crebre punctato, 

 antice utrinque gutta cuprea notato ; elytris postice bene acumin- 

 atis, creberrime punctatis, singulis costis quatuor lawibus instructis, 

 apice purpureo-cupreo, angnlo suturali acute dentiformi. 



Long. 13 lin. 



Hob. Peel Island, Bonin Islands (P. A. Hoist). 



Antennae (except the basal joint) black. Thorax mode- 

 rately narrowed in front, very slightly convex, distinctly but 

 moderately finely punctured, the punctures slightly separated 

 from each other on the disk, more crowded together and 

 stronger at the sides ; the disk has a punctiform impression 

 on each side of the median line, rather in front of the middle ; 

 at the front margin there is on each side a small copDery 

 spot, the commencement as it were of a longitudinal stripe. 

 The elytra are a little wider than the thorax, much more 

 gradually acuminate than is usual in this genus, closely and 

 finely (but distinctly) punctured ; each elytron has four 

 well-marked smooth costas, the third one abbreviated at the 

 base and behind ; the sutural angle is dentiform, but there 

 is only a slight indication of serration at the apical margin. 

 The sides of the sterna and abdomen are densely and very 

 finely punctured and clothed with pale silvery-grey pubes- 

 cence, which is only visible in certain lights. 



This species is perhaps nearest to G. purpureiventris^ 

 Deyr., from Penang &c, but is much narrower, with the 

 elytra more clearly quadricostate &c. 



Ceresium simile, n. sp., Gahan. 



Brunneo-ferrugineum, sparse griseo-pubescens ; capite punctato ; 

 prothorace dorso dense rugoso-punctato, cum macula parva media 



