THE ENTOMOLOGIST. 



• Division T. (Byctiscus, Tlwms.) Posterior coxae suboval, 

 not nearly reaching the episterna, which are very 

 broad. The only two species are conspicuous by 

 their glabrous very brilliant surface and the curious 

 spine on the thorax of the male. 



1. R. Betuleti, Fabr. Glabrous, very shining, brilliant 

 golden green or blue, passing through all the intermediate 

 tints ; thorax moderately punctured ; elytra closely punctured, 

 with the punctures arranged in rows. Long. 3|- — 4j lin. 

 Generally common. 



2. R. Populi, Linn. Closely resembling the preceding, but 

 nearly a half smaller, and broader ; constantly golden green 

 above and dark blue beneath. Long. 2 — 3j lin. Less 

 abundant than the preceding. 



Division IL (Rhynchites proper.) Posterior coxae trans- 

 verse, reaching the episterna, which are moderately 

 narrow. 



A. Size large (4 — 5 lin.) ; brilliant green or cupreous, 



pubescent. 



3. R. auratus, Scop. Golden green, coppery, or even dark 

 violet, pubescent; thorax rugosely punctate; elytra very 

 closely punctate, wdth rows of larger punctures. Long. 4 — 5 

 lin. Birch Wood, on Prunus spinosa ; very rare. Male. — 

 Thorax armed with a spine, as in R. Betuleti. 



4. R. Bacchus, Linn. Generally brilliant purple or cop^ 

 pery, rarely green ; closely resembling the preceding, but the 

 thorax simple in both sexes ; the rostrum entirely violet, and 

 the colour is generally different. Monk's Wood ; and in 

 several of the old collections, but very rare. 



B. Colour testaceous. 



5. R. purpureus, Linn. 1758 (aequatus, Linn. 1767, Desh.) 

 Obscurely aeneous, thickly punctate and pubescent; elytra 

 red ; suture often darker, deeply striate-punctate ; rostrum 

 very elongate. Long. 1 J — 2 J lin. Very abundant in white^ 

 thorn flowers in the spring. 



6. R. caeruleocephalus, Schall. Violet; thorax and elytra 

 testaceous, the latter punctate-striate. Long. 3 lin. One 

 specimen in the British Museum is supposed to have been 



P2 



