7616 Eniomoloyical Society. 



in the London district, and is found on the Erysimum officinale and perhaps some 

 other plants ; the second insect Mr. Waterhouse had met with at Highgate, in the 

 neighbourhood of Box Hill, Surrey, and at Northfleet in Kent, always on the Ery- 

 simum AUiaria, and always unaccompanied by the C. sulcicollis. Its most obvious 

 points of distinction consist in the constantly piichy red colour of the tarsi, and the 

 under parts of the body and the sides of the chest being very sparingly clothed with 

 minute gray-white scales. In C. sulcicollis the under parts are pretty densely clothed 

 with pale scales, and the little triangular plate on the side of the chest, which partially 

 separates the thorax from the elytra, is so completely covered with white or pale buff- 

 coloured scales as to form a conspicuous pale spot at that part. These differences Mr. 

 Waterhouse had formerly noticed when comparing a certain Ceuthorhynchus, presented 

 by the British Museum by Mr. Walton, with the C. sulcicollis, but at that time he 

 imagined Mr. Walton's insect (which was regarded by him as the C. tarsalis of Schon- 

 herr*) was a mere variety of the C. sulcicollis ; he now finds, however, that the differ- 

 ences noticed are accompanied by others ; the red-footed insect differs from C. sulci- 

 collis in having the antennae longer, the thorax more coarsely punctured, the pointed 

 tubercles at the apex of the elytra less distinct, and the interstices of the strias sub- 

 granular. The tarsi, moreover, are shorter and stouter, and the femora are more 

 strongly toothed. The dark colour of the under parts, owing to the scarcity of scales, 

 forms a marked difference when the under side of this insect is compared with that of 

 C. sulcicollis, and when the male sex of each species is compared more important 

 differences are seen. In the male C. sulcicollis the penultimate abdominal segment 

 has two approximated small tubercles, and the last segment is concave in the middle 

 third, the concavity being bounded on each side by a slightly raised ridge ; the chest, 

 moreover, is slightly concave ; in the other Ceuthorhynchus the chest is strongly con- 

 cave in the middle ; the penultimate abdominal segment is simple, and the concavity 

 on the last segment is bounded on either side by a well-marked conical tubercle ; the 

 under parts are likewise less thickly punctured. The C. picitarsis of Schonherr is 

 compared by its describer to the C. sulcicollis, from which it differs in having the 

 tarsi pale ferruginous, and in having the under parts of the body very sparingly scaled, 

 and so far agrees with the insect to which attention is directed ; but C. picitarsis is 

 said to be somewhat smaller than C. sulcicollis, the elytra to be glossy olivaceous-black, 

 with the interstices of the striae distinctly transversely rugulose, the legs somewhat 

 slender, and the femora armed with a minute tooth, characters which do not apply to 

 the insect exhibited ; it appears, in short, to be undescribed, and Mr. Waterhouse 

 proposed for it the name inornatus. The leading characters are as follows : — 



Ceuthoehynchus inornatus. 

 C. niger, parura nitidus, subtus parce albido-squamosus ; tarsis piceo-ferrugineis ; 

 thorace profundius punctate, canaliculate, obsolete bituberculato ; elytris subsulcatis, 

 interstitiis rugulosis subgranulatis, apice indistincte muricatis ; pedibus validis, feraor- 

 ibus fortius dentatis. 



The Secretary read a paper by T. V. Wollaston, Esq., intituled " On the Ptinidae 

 of the Canary Islands." — E. S. 



* On a former occasion Mr. Waterhouse called the attention of the Society to what 

 he believed to be the true C. tarsalis. 



