APPENDIX. 33 



Apart from the structural difference just mentioned, the C.pedatus 

 recedes from the dilaticollis in being on the average a little larger, 

 in its prothorax being less evidently expanded in front, and in its 

 elytra being perceptibly rounded (or more globose), with their basal 

 ridges (or inequalities) rather more developed, and their striae a little 

 deeper and much more conspicuously punctured. 



Genus SPHJERICUS. 



Wollaston, Ins. Mad. 263 (1854). 



Sphsericus ambiguus, n. sp. 



S. albopicto affinis, sed major ac grossius sculpturatus, prothorace ad 

 latera paulo magis sed elytris vix minus rotundatis, antennis pedi- 

 busque crassioribus ac saepius clarioribus. Long. corp. lin. | 11. 



Habitat Maderam, a Dom. Bewicke deprehensus. 



Although unwilling to establish an additional species amongst 

 insects so variable as the Sphcerici, yet a series of examples now 

 before me which were taken by the late Mr. Bewicke in Madeira 

 proper differ so decidedly from all the states of the albopictus hitherto 

 detected, whilst at the same time there is no possibility of identifying 

 them with any other member of the genus enumerated in this 

 volume, that I am compelled in the present instance to do so. 

 Judging from some of the specimens, the S. ambiguus would appear 

 to ascend to a larger size than the albopictus ; and its limbs, which 

 are generally of a clearer hue, are thicker and more developed ; its 

 sculpture is coarser; and its prothorax is perhaps a little more 

 rounded at the sides, whilst its elytra are (if anything) somewhat 

 less so. 



Sphsericus marmoratus, n. sp. 



S. fusco-niger vel fusco-piceus ; capite prothoraceque dense et rugose 

 scabrosis, squamis navescenti-cinereis tectis, hoc parvo, in disco 

 postico subgibboso; elytris rotundato-ovalibus (antice et postice 

 subaequaliter acutis), profunde striato-punctatis, transversim irre- 

 gulariter flavescenti-cinereo squamoso-marmoratis, rarius postice 

 fasciatis ; antennis pedibusque clare rufo-ferrugineis, flavescenti- 

 cinereo squamosis. Long. corp. lin. g-vixl|. 



Var. (3. rotundata [an species ?]. Prothorace etiam densius ac minus 

 grosse scabroso et postice evidentius canaliculate ; elytris sub- 

 rotundatioribus (i. e. ad humeros vix minus declivis oblique) ; 

 an term arum articulis subbrevioribus ac paulo minus robustis. 



Habitat Gomeram, saltern in statu typico, var. /3 ad ins. Hierro 

 pertinente. 



