448 Mr. T. V. Wollaston on Additions to Madeiran Coleoptera. 



XLVIII. — On Additions to the Madeiran Coleoptera. 

 By T. Vernon Wollaston, M.A., F.L.S. 



[Continued from p. 365.] 



Fam. CurculionidaB. 



Genus Rhyncolus. 



(Creutzer) Germ., Ins. Spec. 307 (1824). 



Rhyncolus calvus, n. sp. 



72.piceus vel nigro-piceus, nitidus, calvus; prothorace profuude punc- 

 tate ; elytris sat profunde punctate- (fere etiam subcrenato-) striatis, 

 interstitiis parce et minutissime punctulatis ; antennis pedibusque 

 piceoferrugineis. 



Long, cor p. lin. \\. 



Habitat Maderam australem, in ligno antique ad "Praia Formosa" 

 a Dom. Bewicke repertus. 



R. piceous or dark-piceous (when immature, feri'uginous), 

 shining, and free from pubescence. Rostrum rather narrower 

 than that of the R. tenax, and with less appearance of a central 

 keel. Prothorax deeply punctured, the punctures being larger 

 and less dense than in that insect, and with a few very minute 

 punctules interspersed between them, but without any appear- 

 ance of the subalutaceous sculpture which is there so evident ; 

 also more oval or more regularly rounded at the sides than in 

 the R. tenax, not being so suddenly expanded about the middle, 

 and with still fainter indications (if indeed any) of a central line. 

 Elytra usually a little more picescent than the prothorax ; rather 

 deeply punctate- (or almost subcrenate-) striate, and with a very 

 few and extremely minute punctules down the interstices ; a 

 little more rounded-off at the shoulders than in the R. tenax, 

 and free from the closely rugulose sculpture which is so charac- 

 teristic of that species. Limbs piceo-ferruginous. 



The above Rhyncolus is closely allied to two species which I 

 have captured in the Canary Islands; nevertheless it is just 

 perceptibly narrower and more linear than either of them, as 

 well as a little more piceous; its rostrum is not so broad, and its 

 sculpture is somewhat shallower, its prothoracic punctures being 

 also more dense (particularly in front), and its elytral striae 

 (though deep) not so decidedly punctured, having a more evident 

 tendency to be subcrenulate. It was detected by Mr. Bewicke 

 amongst old rotten wood, during May of 1857, in a small out- 

 house, at the Praia Formosa, near Funchal. 



Genus Hexarthrum, nov. gen. 



Corpus ut in Bhyncolo, sed rostro breviore (i. e. brevissimo) crassiore 

 triangulari {i. e. anticc sensim attenuate) ; scrobe antennali bre- 



