42 Coleojoterological Notices. 



in basalis, to the distinct and even slightly prominent as exhibited 

 in cordatus. There is an undoubted bond of affiliation between the 

 species associated by the author in the group, but it cannot be the 

 form of the basal angles. It would be better to separate them as 

 a group on the longer second antennal joint, which is invariably 

 longer than the next two combined, and the convex head, with 

 small and extremely feeble antennal prominences, or by the small 

 unemarginate labrum, with the apical edge finely and strongly 

 reflexed, or even by the peculiar system of coloration. 



The very decided character separating the mandibularis group is 

 not entirely constant, for in several, if not all the species assigned to 

 it, the acute lateral edge is present near the apex, and in some species 

 not assignable to it, as monticola and dimidiatus, the acute margin 

 becomes obsolete before reaching the base, and in the latter is totally 

 absent, almost throughout the basal sinuation. 



These are matters, however, which must be reserved for a more 

 complete study, and the new species here brought to notice are dis- 

 tributed in the groups as limited by LeConte, a list showing their 

 relative positions being given under each heading. 



It should be said in conclusion that the tarsi are not three-jointed 

 as stated in the books, but more properly four-jointed. In the 

 species allied to armatus, all four joints are perfectly free and dis- 

 tinct, but the basal joint becomes subanchylosed to the second in 

 several species, notably in the semiferriigineus group, and in the 

 nnmdaris group the anchylosis is generally complete, the tarsus 

 appearing to be three-jointed ; even here, however, the suture can 

 often be plainly seen. 



Group 1. — mandihidaris. 



No additional species assignable to this group have been reported, 

 and it is highly probable that brevidens Lee. will prove to be a 

 synonym of mandihidaris Er., the specimens before me showing all 

 degrees of development of the mandibular tooth. 



The magnitude of the triangular incision of the eighth segment in 

 the males of this genus appears to be variable at will, the segment 

 ))eing composed of two overlapping parts, the edge of one forming 

 an oblique line from one side of the apex to the opposite side of the 

 base. When the two parts are pushed apart laterally, the notch at 

 the apex becomes deeper, and as they are closed together it becomes 

 smaller, preserving however the same relative form. 



