304 Mr. T. V. Wollaston on certain Coleoptera 



any other piece of rotten wood except the " decayed box " in 

 which Pentarthrum cylindricum was found (but, on the contrary, 

 implied rather the absence of any opportunity for so doing), I 

 have but little doubt that it must have been taken in company 

 with the Pentarthrum, and is therefore not only (like it) an im- 

 ported species, but one which was introduced from the same 

 country, wherever that may be. The fact, however, of its being 

 conspecific with the Madeiran and Canarian insect, whilst the 

 other one is congeneric with the P. Huttoni from the west of 

 England, would go far to render it, at any rate, improbable that 

 the " box " in question could have come from cither the Mauri- 

 tius or the Cape of Good Hope. 



Fam. CurculionidsB. 

 Genus Pentarthhum. 

 Woll., Ann. Nat. Hist. (ser. 2) xiv. 129 (1854). 

 7. Pentarthrum cylindricum, AYoll. 

 Pentarthrum cylindricum, Woll., Trans. Ent. Soc. Lond. (18G1). 

 A full description of this insect (the only new species amongst 

 Mr. Bewicke's collectanea at Ascension) has been given in my 

 ])aper on "the Atlantic Cossonides," lately published in the 

 ' Transactions of the Entomological Society of London ;' and I 

 will therefore merely quote from that memoir the following ob- 

 servations concerning its capture : — " Many specimens of it were 

 detected by Mr. Bewicke in the decayed wood at the bottom of 

 some boxes which he suspects had been used for importing plants 

 into the island — probably either from the Cape of Good Hope or 

 the IMauritius. It follows therefore that the insect is but a 

 doubtful native of Ascension, and that its presence there may 

 have been only accidental. Still, its close affinity with the 

 British species, and its near relationship with the two Mcsoxeni 

 from Madeira and TencjifFe, would make it at least unlikely 

 that so remote a spot as the Mauritius should be its proper 

 habitat — a conclusion which its admixture (at Ascension) with 

 a single example of the minute Cryphalus aspericollis, which 

 also occurs in both the Madeiran and Canarian groups, would 

 not tend to invalidate." 



Pam. TenelbrionidaB. 



Genus Gnathocerus. 

 Thunberg, Act. Holmiens. 47 (1814). 

 8. Gnathocerus cornutus, Fab. 

 Trogosita cornuta, Fab., Ent. Syst. Suppl. 51 (1798), 



