84 Mr. J. Walton on the genus Rhynchites. 



differ from each other in precisely the same way. I may notice 

 likewise, that the males and females of this and many other spe- 

 cies of Curculionites can be distinguished from each other by 

 the differences in the form of the rostrum and the situation of 

 the antennse. The rostrum in the males is shorter and generally 

 stouter, with the antennse inserted before the middle or nearer 

 the apex than in the females. In the females the rostrum is longer 

 and situated at the middle, or more or less behind the middle*. 

 I have taken both sexes of this species upon the young shoots 

 of the oak in the month of June. 



4. R. ophthalmicus, Steph. 111. 1831. 



— iS) comatus, Schonh. 1833. 



— (?) cyanicolor, id. 



— ((^) similis, Curtis, 1837. 



— sericeus, Steph. Man., not Herbst. 



— {^) tomentosus, Schonh. .'' 



Mr. Stephens is apparently the first author to have described 

 this insect : subsequent to the description which appeared in his 

 ' Illustrations/ he was of opinion that it was identical with the 

 tl. sericeus of Herbst. Dr. Germar however has sent me an in- 

 sect with this last name attached, which is very distinct from the 

 ophthalmicus of Stephens. I have not observed the R. sericeus 

 of Herbst in any of our British collections. 



I have found this species on the white-thorn [Mespilus Oxya- 

 cantha) in woods near Gravesend in the month of May and the 

 beginning of June. 



5. R. nanus, Payk. (1792), Gyl., Germ., Steph,, Schonh. 



— minutus, Herbst, 1797. 



Att. cceruleus, Fab. Syst. Nat. Suppl. 1798. 



— planirostris, Fab. Syst. Eleuth. 1801. 



— (?) cylindricus (Kirb. MSS. and Mus. Kirb.), Steph. 



Of No. 5, 1 have three specimens sent me by Schonherr as the 

 R. nanu^ of Gyllenh. Schonherr also gave the same name to some 

 English specimens I forwarded to him for examination. From 

 Dr. Germar I have the following note relative to this species : 

 " The true minutus of Herbst agrees with R. nanus, Payk. ; and 

 Attelabus asruleus, Fab., and planirostris. Fab. (non Schonh.) are 

 also specifically identical with nanus (Mus. Herbst, Mus. Fabri- 

 cii).^^ 



The Att. cylindricus of Kirby^s MSS. and of his collection I 

 have carefully examined ; it belongs to R. nanus. 



1 have repeatedly found this species upon the birch {Betula 

 alba) in the month of July. 



♦ Notes upon the genera Sifona, &c., Ent. Mag. vol. v. pp. 9, 10. 



