17G Mr. J. S. Bal}' on the differential characters 



B. Metallico-viridls, cteruleo tiucta, elytroruiii vittis 



jeneis. 



C. Metallico-yiridis, elytrorum vittis nigro-cyaneis. 



Ch. phalerata. Germ. Faun. Eur. 16, tab. 13. 



D. Cupreo-aut aureo-jeuea, viridi tincta, elytris rufo- 



aureis, linea angusta suturali, limbo inflexo 

 vittaque discoidali ^neis. 



Ch. superba, Oliv. Eucycl. Metli. v. p. 705. 



E. Metallico-viridis, linea angusta suturali, limbo in- 



flexo vittaque discoidali metallico-cferuleis aut 

 nigro-cjeruleis. 



F. Cseruleo-nigra aut nigra. 



Ch. venusta, a, b, SufFr. p. 175. 

 Ch. nigrina, a, b, SufFr. p. 176. 



G. Viridi-cyanea aut cyanea, elytrorum signaturis 



obsoletis. 



Ch. pnnctatissima, Suffr. p. 174. 

 Long. 3^ — 6 lin. 

 Hah. — European Alps. 



Thorax nearly twice as broad as long; sides nearly 

 straight and parallel from the base to beyond the middle, 

 thence rounded and converging to the apex; disk dis- 

 tinctly punctured, the lateral margin bounded within by 

 a broad, coarsely and irregularly-punctured longitudinal 

 space, the hinder third of wdiich is deeply excavated; 

 the middle third is on a level with the disk, and its 

 anterior third, which is dilated inwardly on the disk, only 

 slightly depressed. Elytra broader than the thorax, sub- 

 elongate and nearly parallel in the $ ; more oblong and 

 dilated posteriorly in the 2 ; convex, strongly and rather 

 closely aciculate-punctate; interspaces grauulose, irregu- 

 larly wrinkled, more strongly so on the outer disk and 

 behind the middle. 



Ch. speciosa is more widely spread and is more variable 

 in size, coloiu" and degree of punctuation than any other 

 species in the sub-group to which it belongs. 



It agrees with gloriosa, hifrons, nivalis and sulcata, in 

 the broadly truncate apical joint of the maxillary palpus, 

 and in having the lateral sulcation of the thorax more or 

 less broadly interrupted in its middle third. Good diife- 

 rential characters exist some of which will be found in 

 the table given above, and others will be pointed out in the 

 descriptions of each species. 



