lyl4.] 31 



The name chalybseus, Germar, being the symbol for a definition 

 which does not sufficiently define, might well have been relinquished ; 

 but it has not. For a long time this name was applied to a species 

 having simple femora and the meso- and metasterna more closely 

 scaled than the remainder of the underside {cf., Weise, Deutsche Ent. 

 Zeitschr., 1883, p. 326). In 1895, however, Weise {op. tit., XXXIX, 

 p. 487) re-named his chalybseus of 1883 pectoralis, and, by implica- 

 tion, transferred the name chalybseus t< another species which he had 

 taken near Weimar, and which, according to Schultze (/. c. p. 419) 

 differed from the older chalybseus, inter alia, by the absence of the 

 very white breast, In Ent, Nachr. 1900, pp. 227-232, Prof. H. J. 

 Kolbe has a paper on the blue species of Ceuthorrhynchus in which he 

 rejects the shifting of the name chalybseus, Germ., to Weise's species 

 from Weimar, and describes the latter under the name of C. ruebsaa- 

 meni. At the request of Dr. Everts, Prof. Kolbe has been so good as 

 to send for my inspection the type of C. ruebsaameni and also one of 

 Weise's Weimar specimens. The latter were found on Abies excelsa, 

 but the real food-plant of the species is rape, on the leaves of which 

 the larva lives in a flat lens- shaped gall about 5 mm. in diameter. I 

 have not, so far, seen any British specimens of C. ruebsaameni, Kolbe ; 

 though I have seen examples from Berlin and Istria, ex. coll. Everts. 

 In size and shape it resembles C. timidus, from which it may be 

 distinguished by the adpressed bristles on the crown (which latter are 

 directed backward, and not forward , as Prof. Kolbe says in his original 

 description), and the continuous and white-scaled middle groove on the 

 pronotum : one sometimes finds specimens of C. timidus in which the 

 middle groove of the pronotum is continuous, but these may always be 

 distinguished by the projecting bristles on the crown. 



Prof. Kolbe, at pp. 231, 232 of his paper just quoted, says that 

 Thomson's C. chalybseus, which he re-names 0. thomsoni, is in all 

 respects very similar to the real chalybseus, but the interstices of the 

 elytra are less convex and narrower, and, particularly near the suture, 

 entirely flat ; the interstitial bristles are stronger upon the outer 

 interstices than upon the inner, the hind femora in the male have a 

 fine pointed toothlet, and in the female a stronger pointed toothlet. 

 By the kindness of Prof. Kolbe, who has allowed me to examine 

 his type, I am enabled to give the following particulars of the Scandi- 

 navian species, which is not unlikely to occur in the northern part of 

 this country. The insect may be at once distinguished by the white 

 interstitial bristles, which become modified on the outer interstices into 



