26 



legs yellow, 2) that the 8th and 9th striae of the elytra 

 (reckoned from the suture) are abbreviated at base, that 

 the 10th stria is not abbreviated and that below this there 

 is a (consequently 11th) stria, abbreviated behind. 



Having through the courtesy of Professor C. Auri- 

 villius and Professor Y. Sjø stedt had submitted for 

 examination from „Naturhistoriska Riksmuseum" in Stock- 

 holm some specimens of O. flagelliim, for which I am 

 indebted to both of the said gentlemen, I have been enabled 

 to ascertain, that Ericssons aforesaid description as to 

 the colour of that species does not comply with its actual 

 appearance, it being in the said respect in full accordance 

 with O. angiistifrons, which implies his having based his 

 description on an immature specimen. Nor is his descrip- 

 tion of the arrangement of the striae quite correct, it being 

 the 7th and 8th striae, which are abbreviated at base, 

 whereas the 9th is not abbreviated; below this there is a 

 10th stria, abbreviated behind; the arrangement of the striae 

 is thus similar to that in angustifrons. 



Besides on. the points set off in the aforesaid descrip- 

 tion O. angustifrons may be discriminated from O. fla- 

 gelliim by the difference in size of the first two joints of 

 the funiculus, O. flagelliim having the 1st joint hardly 

 twice as long as broad and hardly twice as long and 

 broad as the 2nd joint; the latter, which is hardly twice 

 as long as broad, is considerably stronger dilated towards 

 apex than in O. angustifrons, and the 2nd to 6th joints 

 of the funiculus are in O. flagellum of equal breadth and 

 broader than in O. angustifrons. 



The latter differs from O. populi by being smaller, by 

 having comparatively shorter, broadly ovate elytra and 

 shorter antennae and legs and by having the forehead 

 perceptibly narrower as compared with the width of 

 the rostrum at base, the proportion being in O. populi 

 1 to 2, whereas in O. angustifrons it is 1 to 3, 



